引用本文:朱 青,郭 熙,韩 逸,江叶枫,余慧敏,傅聪颖.南方丘陵区土壤硒空间分异特征及其影响因素 ——以丰城市为例[J].土壤学报,2020,57(4):834-843. DOI:10.11766/trxb201904280083
ZHU Qing,GUO Xi,HAN Yi,JIANG Yefeng,YU Huimin,FU Congying.Spatial Differentiation of Soil Selenium in Hilly Regions of South China and Its Influencing Factors: A Case Study in Fengcheng City[J].Acta Pedologica Sinica,2020,57(4):834-843. DOI:10.11766/trxb201904280083
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南方丘陵区土壤硒空间分异特征及其影响因素 ——以丰城市为例
朱 青1, 郭 熙1, 韩 逸1, 江叶枫1, 余慧敏1, 傅聪颖1,2
1.江西农业大学国土资源与环境学院;2.江西省鄱阳湖流域农业资源与生态重点实验室
摘要:
江西省丰城市是典型的富硒土壤分布区,基于丰城市2015—2016年采集的699个表层(0 ~ 20 cm)土壤样点数据,运用地统计分析、相关性分析、地理探测器等方法,系统分析了丰城市土壤硒的含量、空间分异特征及其影响因素,以期为土壤硒的涵养与富硒土地的生产功能提供有价值的参考。结果表明:丰城市土壤硒含量在0.13~0.69 mg∙kg-1之间,平均值为0.33 mg∙kg-1,是全国土壤硒元素背景值(0.29 mg∙kg-1)的1.14倍,变异系数为27.27%,呈中等程度变异性。经半方差函数分析,土壤硒变程为12.86 km,空间自相关范围较大;块金效应值为44.30%,表明土壤硒空间变异主要受结构性因素影响。在空间分布上,热点区(高值聚集)主要分布在泉港镇西部、董家镇东南部、尚庄街办中部、上塘镇西南部、曲江镇西北部、洛市镇中部和南部以及秀市镇西南部。砷、铜、汞、氧化钾、氧化钙、pH、成土母质和高程对土壤硒空间变异均有显著影响(P <0.05),但影响程度不一。其中,砷的独立解释能力最高,为29%,对丰城市表层土壤硒的富集与迁移起到重要作用。
关键词:  土壤硒  聚类特征  空间变异  影响因素  丰城市
基金项目:国家重点研发计划资助项目(2017YFD0301603);江西省赣鄱英才“555”领军人才项目(201295)
Spatial Differentiation of Soil Selenium in Hilly Regions of South China and Its Influencing Factors: A Case Study in Fengcheng City
ZHU Qing,GUO Xi,HAN Yi,JIANG Yefeng,YU Huimin,FU Congying
College of land resources and environment, jiangxi agricultural university
Abstract:
In Jiangxi Province, Fengcheng City is a typical area rich in soil selenium. Based on the data of the 699 soil samples collected from the surface layer (0-20 cm) of farmlands in Fengcheng City in 2015—2016, geostatistical analysis, correlation analysis and geographic detectors were applied to systematically analyze spatial differentiation of soil selenium in distribution and its influencing factors. The research was done in an attempt to provide certain valuable reference for conservation of soil selenium and the production function of the selenium-rich land. Results show that soil selenium contents of Fengcheng City ranged from 0.13 to 0.69 mg∙kg-1 with coefficient of variation being 27.27% or moderate in level and averaged 0.33 mg∙kg-1, about 1.14 times as high as the soil selenium background value (0.29 mg∙kg-1) of the country. Semi-variogram function analysis shows that the range of soil selenium was 12.86 km and quite large for spatial autocorrelation, and that its nugget effect value was 44.30%, which indicates that spatial variation of soil selenium was mainly affected by structural factors. In the spatial distribution, hot spot areas (area where high values concentrate) were distributed mainly in the west of Quangang Town, the southeast of Dongjia Town, the center of the Shangzhuang Neighborhood, the southwest of Shangtang Town, the northwest of Qujiang Town, the center and south of Luoshi Town and the southwest of Xiushi Town. Arsenic, copper, mercury, potassium oxide, calcium oxide, pH, soil parent material and elevation are factors affecting spatial variability of the soil selenium but vary in extent (P <0.05). Arsenic is the highest in the effect, explaining 29% of the variability, and plays an important role in the enrichment and migration of selenium in the topsoil of Fengcheng City.
Key words:  Soil selenium  Clustering characteristics  Spatial variation  Influencing factor  Fengcheng City