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  • Conception of comprehensive utilization evaluation of urban underground space resources
    GE Weiya, WANG Rui, ZHANG Qing, XING Huaixue, ZHOU Jie
    To realize the safe development and management of underground space is an important part of China's overall territorial space governance system.Currently, the comprehensive evaluation of underground space resources in China is facing new challenges due to its shortcomings in the application of geological achievements, docking of territorial space planning and data sharing services.Problem lies in the lack of high precision of geological survey results and enough systematic, not implemented in the process of planning implementation management to make full use of the evaluation results, geological investigation results and space urgently needs to improve the use of information of alignment. As a result, the utilization of urban underground space resources is often "impossible to rely on", "no evidence to rely on" and "difficult to implement planning" for a long time.In view of these shortcomings, the concept of underground space resources investigation and comprehensive evaluation system- underground space planning and control system is proposed, that is, to develop and utilize urban underground space resources in a scientific and safe manner, a three-dimensional geological structure investigation should be carried out with planning and control as the guide, and a three-dimensional geological structure model of underground space resources should be constructed.Through comprehensive consideration of geological conditions, development and utilization status of underground space, underground emergency water source, protection of underground cultural relics and other factors, the underground space resource potential is systematically evaluated, and the comprehensive coordinated development and utilization control and evaluation system of various underground space resources is constructed.The study on the comprehensive development and utilization of underground space resources is of great significance to the expansion of new space for urbanization development, the opening up of new resources for urbanization construction, the construction of a territorial space governance system for the whole region, and the coordination of territorial space resource planning and management.
    2021  .  40(10):    1601-1608    [摘要](117)    [PDF](133)
  • Exploration on evaluation method of underground space resources carrying capacity of megacity: A case study of Shanghai
    LIU Ting, WANG Hanmei, SHI Yujin, WANG Zhihui, CHEN Daping
    Since the "Twelfth Five-Year Plan", the contradiction between the rapid expansion of space demand and the limited space resources in megacities has become increasingly prominent.The development and utilization of underground space has entered a rapid development stage.Under this situation, understanding the carrying capacity of underground space is of great significance for scientific planning and rational utilization of underground space.From two perspectives, carrying background (reflecting the endowments of underground space resources and the pros and cons of the environmental capacity) and carrying actuality (reflecting the matching degree of the capacity of the underground space resource and the economic and social development), the evaluation index system was built, and evaluation of underground space carrying capacity was studied to provide technical support for the development and utilization of underground space in megacities.The central city of Shanghai with limited space resources was selected as a case to evaluate the underground space carrying capacity, and the bearing capacity of underground space resources was displayed in three dimensions with the help of 3D modeling technology.The results show that the carrying capacity of the underground space resources in the central city of Shanghai is generally good, and the underground space can be further developed rationally to improve the urban space utilization and alleviate the pressure of limited space resources.
    2021  .  40(10):    1609-1616    [摘要](82)    [PDF](107)
  • Deformation and failure mechanism of rainfall-induced shallow loess landslide
    SUN Pingping, ZHANG Maosheng, JIANG Ruijun, JIA Jun, LIU Feng, LIU Mengmeng
    The shallow loess landslides, triggered by precipitation has the characteristics of serious catastrophability, wide range of influence and large impact area, is one of the serious disaster in the Loess Plateau.It is difficult to identify the initial failure position and actual failure surface with the classical analysis method by using one safety factor to describe the slope stability, which limits the description of the failure process of slopes and consequently influence the effective prediction of landslides.Guided by the theory of unsaturated soil matric suction, the water- stress coupling model of loess slope was established based on the Slope Cube module with the Hydrus software.According to the statistics of slide-prone morphology of loess slopes, the slope stability response to rainfall conditions was calculated under different conbinations of convex, concave and linear, and the three slope gradients of 30°, 40° and 50°.The results show that different loess slopes have obvious responses to precipitation, and its influence is controlled by the slope types.Under the condition of the same rainfall and the same slope, the possibility of superficial surface damage occurs on the linear slope is the lowest, followed by the concave slope and the convex slope.Correspondingly, the time consuming of instability is the shortest for convex slopes, the second for the concave slopes, and the longest for the linear slopes under the same conditions.This study can provide support for early identification and prediction of shallow loess landslides.
    2021  .  40(10):    1617-1625    [摘要](82)    [PDF](94)
  • Geological suitability evaluation for sponge city construction of Zhengzhou
    WANG Cuiling, LIU Changli, LYU Dunyu, MENG Shuran, LIU Songbo
    Natural background and geological conditions have important influence on the layout of low-impact development facilities in the sponge city planning and construction.Aiming at the 1945 km2 sponge city planning area of Zhengzhou city, according to the functions of water storage, seepage and water purification to be achieved by the construction of sponge city, based on the analysis of surface vegetation, topographic slope, vadose zone and aquifer, the geological suitability evaluation system was constructed suitable for the construction of sponge city, and it was evaluated with the analytic hierarchy process.The results show that geologically suitable area accounts for 3.83% or the total planning area, good suitability area for 33.12%, moderately suitable area for 54.05%, and poor fit area for 9.00%.Among the 12 key construction areas of sponge city planned in Zhengzhou, 2 cover unsuitable construction areas, which are distributed in the northwest of Longhu and Shuanghe Lake.There are natural conditions for building sponge city in Air Harbour.It is suggested to plan key sponge construction area around the Donghu ecological node.The evaluation result of geological suitability of sponge city construction is of reference significance to the planning and construction of sponge city in Zhengzhou.
    2021  .  40(10):    1626-1635    [摘要](79)    [PDF](103)
  • Comprehensive quality evaluation of underground space resources in Yinchuan City
    YAN Jinkai, ZHAO Yinxin, WANG Zhiheng, WANG Zhihui, LIU Kai, REN Tianxiang, XU Bo
    The rapid development of urban economy has led to the increasing shortage of ground land.The evaluation of comprehensive quality of urban underground space resources for the efficient and reasonable use of underground space becomes an important way to solve the problem of urban diseases.Taking Yinchuan City as an example, the comprehensive quality evaluation of underground space resources was carried out.The difficulty, potential value and comprehensive quality evaluation models of underground space resources development were established respectively, and the evaluation indexes including geological conditions, environmental conditions and social and economic conditions were determined.The weight of each evaluation index was determined by using analytic hierarchy process (AHP).By using GIS technology, the difficulty and potential value of underground space resources development in Yinchuan City were evaluated, and the comprehensive quality evaluation results of Yinchuan underground space resources were obtained.The results show that the development difficulty of shallow underground space resources in Yinchuan City is mainly affected by rock and soil problems, as well as obviously restricted by ecological protection requirements and existing building facilities.The areas with high potential value are the central urban area and the urban areas of Yongning county and Helan County.The underground space resources around drum Tower, railway station, bus station and other core areas in the central urban area have the highest comprehensive quality grade.The evaluation results have high reference value for urban development planning and underground space development and utilization in Yinchuan City.
    2021  .  40(10):    1636-1643    [摘要](70)    [PDF](78)
  • Geological suitability evaluation of underground space development and utilization in piedmont alluvial plain cities: An example of Chengdu
    LI Pengyue, WANG Donghui, LI Shengwei, HAN Haodong, WANG Chunshan, XU Ruge, TIAN Kai
    The development of underground space is irreversible, and the unreasonable development will cause a huge waste of valuable underground resources.In order to improve the rational development and orderly utilization of underground space resources, it is necessary to make a preliminary evaluation of the suitability of underground space development and utilization.Based on the cooperative development and utilization of multi-resources in underground space and the reciprocal feed-back response of geological environment problems, an evaluation model based on "geological resources", "geological structure" and "geological problems" was proposed, that is, geological resources evaluation and difficulty evaluation of underground space development.Finally, a set of geological suitability evaluation model suitable for the development and utilization of underground space resources in piedmont alluvial plain city was established by using mathematical methods such as analytic hierarchy process, fuzzy comprehensive evaluation method and deduction method of restricted factors.The evaluation results show that the shallow underground space in the study area is not suitable for development due to the influence of existing buildings, while the middle-deep underground space is more suitable for development.The results can provide scientific basis and effective guidance for the development planning and construction of underground space in the study area, thus reflecting the rationality and scientificity of urban underground space development and utilization planning.
    2021  .  40(10):    1644-1655    [摘要](81)    [PDF](87)
  • Automatic monitoring of natural resource in Anqing City of Anhui Province based on statistical learning methods-a case study of mountains
    NI Huan, NIU Xiaonan, LI Yunfeng, HAO Jiaojiao
    Remote sensing, a technology used for quickly and extensively acquisition of land cover information, provides a reliable data source for complex natural resource survey.Aiming at the problem of mountain boundary recognition, an unsupervised statistical learning method was proposed to extract mountain features using remote sensing satellite images for modeling of mountain features.Specifically, DBSCAN algorithm and edge detection ideas were used to identify the mountain area and extract the mountain boundary.This approach recognizes the mountain boundary automatically, which does not rely on marking the ground truth manually.In the experiment, the Landsat 8 remote sensing satellite image data of Anqing City were used to effectively identify the mountainous area and extract the boundaries of the mountains.Through qualitative and quantitative analysis, the reliability of the proposed method was verified.Moreover, it proved the application potential of remote sensing technology and statistical learning theory in the field of natural resource survey.
    2021  .  40(10):    1656-1663    [摘要](66)    [PDF](164)
  • Geochemistry and spatial distribution of Se element in soils of typical Se-rich area in Xinmi, Henan Province
    MAO Xiangju, LIU Lu, CHENG Xintao, HU Quanhui, XIAO Fang, NI Wenshan
    Selenium (Se) is an essential trace element for humans and animals.Through the soil quality geochemical investigation and evaluation, it was found that the southern part of Xinmi was rich in selenium resources. Soils (topsoil and subsoil), crops (wheat) and rock samples were systematically collected and analyzed, and the spatial variation, genetic mechanism and biology effect of soil Se were discussed.The analytical data showed that soil total Se contents in southern Xinmi ranged from 0.06 mg/kg to 3.99 mg/kg, with an average of 0.44 mg/kg. According to the evaluation standard of selenium-rich soil in Henan Province, the area of selenium-rich land in the working area is 103.7 km2. The analysis of soil profile and soil-forming rock indicates that the soil Se in the study area was mainly derived from soil forming rock, secondary enrichment and anthropogenic source. The Se-enriched ratio of wheat samples was 52.94% according to national standards.
    2021  .  40(10):    1664-1670    [摘要](81)    [PDF](65)
  • Evaluation of soil environmental quality and potential ecological hazards in Jinzhou City, Liaoning Province
    DAI Yajian, CUI Jian, GUO Changlai, LI Xuguang, ZHAO Yan, SHI Xufei, SUN Xiubo, JIANG Shan
    In order to understand the soil environmental quality and potential ecological hazards in Jinzhou urban area, the surface soil of the urban area was taken as the research object;the environmental quality of heavy metals in the surface soil of the urban area was evaluated according to the soil environmental quality control standards for agricultural land and construction land issued in 2018;and the potential ecological hazards were evaluated by the potential ecological hazard index method.The results show that the enrichment coefficients of Hg and Cd in surface soil are 2.36 and 2.27 respectively, and the variation coefficients of Hg and Cd are 1.28 and 1.49 respectively.The average contents of Hg, Zn and Cu in green land soil in urban area are 1.5 times higher than those in dry land in suburban area.The first-class risk-free soil is the main soil in Jinzhou City, and the second-class risk controllable soil is more distributed in the suburb, Tanghezi industrial zone is surrounded by the third-class soil with high pollution risk.The results of potential ecological hazard assessment show that Hg element is easy to release, whose potential toxicity to organisms is relatively high, while other elements are of low ecological hazard, and the comprehensive potential ecological hazard index (RI) is of medium ecological hazard.
    2021  .  40(10):    1671-1679    [摘要](65)    [PDF](63)
  • Characteristics and potential risk assessment of heavy metal contents in urban soil, Liaoyang City
    WANG Chunpeng, YOU Jiangong, SUN Hao, TIAN Ye, HOU Hongxing, SHI Jingtao, JIN Shengkai, WANG Mo
    The contents and pollution degree of As, Cd, Cr, Cu, Hg, Ni, Pb, Zn and other elements in surface soil samples of Liaoyang urban greenbelt were comprehensively analyzed by pollution load index method and ecological risk index method.The results show that, except As, the concentrations of other seven heavy metal elements in soil is higher than the national background value, of which Hg, Cd are the main pollution elements, and the degree of their contamination has reached heavy and moderate respectively.The trace elements of Zn, Pb, Cu, Cr and Ni are in slight pollution, while As is basically free of contamination.The evaluation of the ecological risk shows that Hg and Cd elements are the main ecological risk factors, and Hg and Cd belong to strong and medium ecological risk respectively.In general, Liaoyang City has slight heavy metal element pollution with medium potential ecological risk.The soil ecological environment in the new city is better than that in the old one, and it is recommended to further play the role of dredging function of the new city to relieve the urban pressure.
    2021  .  40(10):    1680-1687    [摘要](76)    [PDF](71)
  • Geological heritage resources endowment and protective utilization in Jinzhou City, Liaoning Province
    ZHAO Yan, GUO Changlai, LI Xuguang, SUN Xiubo
    Geological heritage resources are the most valuable and non-renewable natural heritages to improve the quality of life of mankind at present and in the future, and their protection, utilization and management are the premise and foundation of sustainable development of geological relics.Located at the transitional zone between Yanshan Mountains and western Liaoning Mesozoic basin, due to strongly influence of long geological evolution process, Jinzhou in Liaoning Province is a host to abundant geological heritage resources, especially for the typical stratigraphic section, paleontological fossil, granite landform, river landscape and coastline.According to the special investigation of geological relic resources in Jinzhou, the geological relic resources in Jinzhou can be divided into 2 classes, 7 subclasses, 11 subgenera, a total of 238 sites, with various types, unique connotations and wide distribution range.However, as a result of lack of basic data and funds, poor awareness of the protection, and imperfect management mechanism, damage of these precious resources is becoming increasingly conspicuous, even some sites are at risk of disappearing.Specially for the problems in the spatial layout of Jinzhou city's "mountain", "sea" and "city" tourism industries, the creation of quality tourist destinations, livable cities, ecological civilization, rural revitalization and the protective use of geological remains, it is necessary to establish a geological heritage resource protection list, and to form a multi-level and diverse protective utilization path by means of popularity of science bases, special scenic corridors, scenic tourist areas, characteristic towns, and geological cultural villages.
    2021  .  40(10):    1688-1696    [摘要](80)    [PDF](71)
  • Automatic recognition method of urban underground silt based on remote sensing image—a case of Anqing City
    NIU Xiaonan, NI Huan, LI Yunfeng, ZHANG Qing, ZHOU Xiaoping, LU Yuanzhi, HAO Jiaojiao
    Underground silt, due to complex and loose compound, is a potential threat in urban infrastructure.Compared with the traditional methods of detecting underground silt, such as geophysical and micro-motion detection technology, remote sensing monitoring has the advantages of wide monitoring range, high efficiency and repeatability.The detection method of remote sensing image change was used to extract the spatial location and area of underground silt in urban area of Anqing.The method was mainly based on the object-oriented image analysis method, first splitting the multi-temporal images separately, and then using the SVM algorithm to classify the land cover.Based on the classification results, the spatial distribution of underground silt was extracted by change detection analysis, which could be defined as the target area or key area for the implementation of physical exploration, so as to detect the depth of the underground silt.Based on the results of two phases of image classification, change detection analysis was carried out to extract the spatial distribution and range of underground silt, and select typical areas for field verification using microtremor detection.The proposed method can provide decision support for urban engineering construction and urban planning.It can delineate the target area or key area for geophysical exploration, and improve the efficiency of geophysical exploration.
    2021  .  40(10):    1697-1706    [摘要](65)    [PDF](71)
  • Urban heat island effect based on aerial thermal infrared hyperspectral TASI Data
    SUN Xiubo, GUO Changlai, DAI Yajian, LI Xuguang, ZHAO Yan, CUI Jian
    The research on the urban heat island effect based on aerial thermal infrared hyperspectral TASI data was conducted.By establishing the empirical relationship of thermal infrared hyperspectral emissivity, the MMD module in the separation method (TES) was improved, and a temperature inversion model for TASI data was established.Using this model, TASI data processing and temperature inversion in the 1500 km2 area of Jinzhou City were completed, and the spatial distribution, range and intensity of urban heat islands were studied.The results show that the average absolute error between the inversion temperature and the measured temperature of the TASI data is 0.81 K, and the average relative error is 0.25%.The extracted range of urban thermal anomalies is accurate, which can provide certain decision support for the research of urban heat islands.The intensity of urban heat islands shows a positive correlation with the permeable surface and a negative correlation with the vegetation cover.It has a greater correlation with the type of used land cover.The urban heat island intensity of modern residential and commercial areas is higher than that of urban villages and rural-urban fringe buildings, and the urban heat island intensity of agricultural land is the lowest.
    2021  .  40(10):    1707-1712    [摘要](60)    [PDF](101)
  • Ground temperature prediction based on shallow-surface ground temperature and in-situ thermophysical parameters
    ZHANG Qing, LI Yunfeng, GONG Xulong, HOU Lili, ZHOU Xiaoping, LU Yuanzhi, NIU Xiaonan
    In recent years, geothermal resources as a new clean energy have begun to attract widespread attention.China is rich in shallow geothermal energy resources, but exploration methods limit its large-scale development.Thermophysical parameter is one of the key parameters of geothermal energy carrier, which determines the thermal energy transmission speed and the distribution of the temperature field of the rock and soil.Therefore, shallow temperature measurement and in-situ thermophysical parameter tester based on thermophysical parameters were used to acquire ground temperature and thermophysical parameters in the field tests.The one-dimensional steady-state heat conduction theory was used to establish the geothermal field prediction model, and the lithological measurement and generalized thermal physical parameters were used to predict the geothermal field distribution of the constant temperature layer.The results show that the shallow geothermal field is greatly affected by the river water flow.The adoption of lithology generalization and the measured thermal physical parameters resulted in almost the same prediction of the temperature field of the constant temperature layer, indicating that it is very effective to predict the distribution of the temperature field of the constant temperature layer by using the developed instruments and models.In addition, the method is convenient and fast, which can be used to provide reasonable suggestions for the development and utilization of shallow geothermal energy, and it can be widely used in practical projects.
    2021  .  40(10):    1713-1719    [摘要](58)    [PDF](56)
  • Application of audio magnetotelluric sounding to the seawater intrusion survey of Jinzhou
    HUAN Hengfei, GUO Changlai, CUI Jian, NI Jin, SHI Xufei, MA Hongwei
    The invasion of sea and salt water in big and small Linghe region of Jinzhou City has seriously affected the local economy and people's quality of life.In order to find out the boundary change and pollution scope of the sea and salt water in the study area, five AMT profiles have been completed.The profile data is inversed by the improved NLCG method.The two-dimensional inversion results directly reflect the distribution range of the salt and fresh water in the study area, and give the boundary location of the salt and fresh water.The results show that the transgressive range of L0 and L1 profile does not expand, the transgressive range of L2 profile is expanding, part of fresh water has been polluted by the underground ancient saline water at L3 profile, and the fresh water is not polluted at L4 profile, which are basically consistent with the hydrogeological drilling and mechanical well survey data.In a word, AMT method is feasible and effective to study the occurrence state and change rule of sea and salt water in the Jinzhou area, which can provide basic geophycical data for environmental hydrogeology investigation.
    2021  .  40(10):    1720-1728    [摘要](63)    [PDF](68)
  • Characteristics of shallow underground ancient channels in urban areas: A case study of Quaternary underground palaeochannel in Tonghu Basin, Guangdong Province
    WANG Tao, YANG Kaiyue, LI Weirong, XIONG Wei, ZHU Haibao
    Human civilization and urban development are closely related to rivers.Due to its longitudinal and horizontal evolution, the complex distribution of palaeochannel formed in the geological history period and buried underground, the distribution in urban underground is relatively complex.However, in view of the prominent engineering geological problems such as the sensitivity and vulnerability of the distribution area of palaeochannel in the process of space development, it is urgent to find out the spatial characteristics and engineering characteristics of palaeochannel course.The quaternary system of Tonghu basin in Huizhou City, located in the east wing large bay area of Guangdong Province, was taken as an example. Comprehensive use of drilling and geophysical data, combined with surface inherited deposits, this work started from fine stratigraphic division and sedimentary facies identification, through the process of "vertical staging, lateral demarcation, flat profile interaction". A set of methods for analyzing and describing ancient rivers were establish by analyzing the structure of ancient river and sedimentary interior in depth step by step, which can provide reference for the characterization of underground space in other areas of the Greater Bay Area and other cities with similar sedimentary characteristics.
    2021  .  40(10):    1729-1736    [摘要](63)    [PDF](74)
  • Controls on crystallization of cassiterite from the southern Hunan: Evidence from cathodoluminescence, trace elements and geochronology
    MA Shouxian, LI Houmin, SUN Yan, CHEN Lei, PANG Xuyong, ZHANG Yingli, ZHANG Peng
    Distinct types of tin polymetallic mineral deposits were formed in the southern Hunan as an important section of the Nanling non-ferrous and rare metallogenic belt. It is still not fully understood about the fluid source, composition and physicochemical state of various tin deposits.Five types of tin ores, including proximal skarn, distal skarn, greisen, chlorite vein and quartz vein from the Xianghualing, Furong and Hongqiling deposits, were taken as the cases to discuss controls on the crystallization process of cassiterite based on the analysis of microstructure, chronology and in-situ trace element.LA-ICP-MS cassiterite U-Pb dating of in the Hongqiling tungsten-tin deposit yielded an age of 153.7±2.4 Ma.The color change of CL images of different types of cassiterite from southern Hunan is mainly related to the relative content of Ti, Nb and Ta.The color of CL images is lighter when the content of Ti is high, while the color of CL images is darker when the content of Nb and Ta is high.The Zr/Hf ratio of cassiterite is interpreted as assimilation of wall rock and fractional degree of the ore-forming fluid.Cassiterites from skarn and chlorite vein have a higher Zr/Hf ratio than its ore-bearing granite, which is related to the strata.On the contrary, cassiterites from greisen and chlorite vein show a low Zr/Hf ratio indicating a highly fractionated fluid.The primary and secondary texture developed in cassiterites from chlorite veins and quartz veins demonstrates an opposite change of Fe, W, U content and Zr/Hf ratio, probably implying addition of meteoric water and plused magmatic fluid, respectively.
    2021  .  40(10):    1737-1756    [摘要](69)    [PDF](146)
  • Discovery of Middle Jurassic volcanic rocks in the Duobaoshan area of Heilongjiang Province and constraints on the influence area of the Mongolian-Okhotsk Ocean closure
    HAO Shilong, LI Chenglu, DING Jishuang, YU Yuanbang, ZHAO Huanli, LI Bowen
    The Duobaoshan area of Heilongjiang Province is located in the eastern part of the Central Asian Orogenic Belt and the southeastern margin of the Xing'an Block, where large areas of Early-Middle Jurassic intrusive rocks are developed, but no contemporaneous volcanic rock has been reported there.During the exploration of gold deposits in the Duobaoshan area, volcanic rocks of the same period were discovered for the first time and they were identified as a suit of dacite, rhyolite, and trachyte.Zircon U-Pb dating and petrogeochemical analyses were carried out on these volcanic rocks to further clarify their formation age and tectonic significance.The U-Pb dating of zircons from the volcanic rocks yielded ages of 167.1~169.3 Ma, indicating that these rocks erupted during Middle Jurassic.The petrogeochemical analysis shows that the volcanic rocks are characterized by high alkali (Na2O+ K2O=3.70%~7.66%) and aluminum (Al2O3=11.42%~19.00%), and are peraluminous (A/CNK=1.08~3.73) with high potassium calcium alkali.The rare earth elements are characterized by the enrichment of light rare earth elements and right-leaning of heavy rare earth elements depletion, with slightly negative Eu anomalies (δEu=0.53~0.79).Trace elements are enriched in Rb, Ba, K, Th, U and Pb, and depleted in Nb, Ta, Ti, P and Sr.It is generally shown that the Mid-Jurassic volcanic rocks were derived from the partial melting of newly continental crust material.The discriminant diagrams of Ta-Yb and Nb-Y indicates that the Middle Jurassic volcanic rocks were formed in the compressional background.Combined with the regional tectonic setting and evolution characteristics, it is concluded that the Middle Jurassic volcanic rocks should be the product of the continent-continent collision caused by Mongolian-Okhotsk Ocean closure.Indicatively, the collision affected the southeastern margin of the Xing'an Block.
    2021  .  40(10):    1757-1772    [摘要](73)    [PDF](73)
  • Selenium geochemistry of soil and development potential of Se-rich soil in Xingkai Lake Plain
    YANG Ze, LIU Guodong, DAI Huimin, ZHANG Yihe, XIAO Hongye, YIN Yuchao
    The results of geochemical survey of land quality show that the soil in Xingkai Lake Plain is generally sufficient in selenium, and the area of Se-rich soil is less than 1%.The distribution of Se in soil has a good inheritance from the parent material of soil.The highest average Se content is found in the soils originated from the Neogene Fujin Formation (N1f), with an average value of 0.375 mg/kg.This stratum controls the main distribution of Se-rich soils in the study area.The lowest Se content is found in the soils originated from the Carboniferous Beixing Formation tuff, with an average value of 0.183 mg/kg.Meanwhile, soil Se content is also affected by geochemical environment, soil type, soil properties and other natural conditions.The Se content of white clay soil is the highest, and that of dark brown soil is the lowest.Se is significantly positively correlated with soil Corg, N, P, TFe2O3, S, As, Cr, Cu, Hg, Pb, Cd and Ni, and negatively correlated with pH, CaO, Na2O and Zn.In addition, the comprehensive quality of land in the study area is excellent.The five potential Se-rich areas are in line with the AA green food producing areas, and natural Se-rich rice has been found, which has great potential for the development of Se-rich agricultural products.
    2021  .  40(10):    1773-1782    [摘要](86)    [PDF](95)

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