土壤2018，Vol.50Issue(1)：181-189,9.DOI:10.13758/j.cnki.tr.2018.01.024
湘西喀斯特区植烟土壤有效磷时空变异及风险评估
Temporal and Spatial Variability Risk Assessment of Soil Phosphorous in Karst Tobacco-planting Region of Xiangxi, Hunan
摘要
Abstract
Based on methods of spatial autocorrelation, semi-variance function and the fractal dimension as well as the data of soil available phosphorus in 2000 and 2014, the spatiotemporal variation and environmental risks of soil available phosphorus in Karst tobacco-planting region in Xiangxi of Hunan were studied. The results showed that, during the 14 years, soil available phosphorus content increased by 30.89 mg/kg; the Z scores of soil available phosphorus index decreased, fractal dimension and the nugget effect increased, indicating a weaker spatial structure and stronger stochastic variability; the areas of 'extremely high','very high' and 'high' levels were increased by 28.36%, 26.89% and 25.94%, while the areas of 'low' and 'very low' levels decreased by 57.45% and 27.12%, respectively; There were significant correlation between soil available phosphorus and elevation, soil parent material, land use type, rotation mode and SOM content; Probability of soil available phosphorus content exceed the risk critical value increased greatly, the total areas of very high risk (probability >80%), high risk (probability 60%–80%) and medium risk (probability 40%–60%) accounted for 1.77%, 5.40% and 13.96% of the total study area, respectively. North of Longshan and east of Yongshun are the key regions to control agricultural non-point pollution of phosphorus.关键词
喀斯特/植烟土壤/有效磷/时空变异/环境风险Key words
Karst area/Tobacco-planting soil/Available phosphorus/Spatiotemporal variation/Environmental risk分类
农业科技引用本文复制引用
李强,戴美玲,向德明,黎娟,周米良,田峰,田明慧,张黎明..湘西喀斯特区植烟土壤有效磷时空变异及风险评估[J].土壤,2018,50(1):181-189,9.基金项目
湖南省教育厅项目(CX2010B309),湖南省烟草公司项目(2016-02)和湘西烤烟良好农业操作规范及推广应用研究项目(州烟司2012-37)资助. （CX2010B309）
