北京平谷区土壤有效磷的空间变异特征及其环境风险评价
Spatial Variability of Soil Available Phosphorus and Environmental Risk Analysis of Soil Phosphorus in Pinggu County of Beijing
中国农业科学 . 2009, (4): 1290 -1298 .  DOI: 10.3864/j.issn.0578-1752.2009.04.020