| 紫色土磷素流失的环境风险评估-土壤磷的“临界值” |
| |
| 引用本文： | 李学平,石孝均,刘萍,隋涛.紫色土磷素流失的环境风险评估-土壤磷的“临界值”[J].土壤通报,2011(5):1153-1158. |
| |
| 作者姓名： | 李学平 石孝均 刘萍 隋涛 |
| |
| 作者单位： | 滨州学院城市与环境系;西南大学资源环境学院; |
| |
| 基金项目： | 国家“十一五”科技支撑计划项目(2006BAD05B09); 国家土壤肥力监测网络和农业部“948”项目(2006-Z53)资助 |
| |
| 摘 要： | 采用室内培养的方法,研究了3种类型的紫色土旱地和淹水土壤磷素流失的环境阈值。结果表明:无论是淹水土壤或旱地生境,3种紫色土Olsen-P与CaCl2-P之间都存在一个"临界值",酸性、中性和钙质紫色土磷素淋失临界点的Olsen-P含量分别为67.2、85.8和113.8 mg kg-1。淹水土壤磷素环境敏感值在酸性、中性和钙质紫色土上,Olsen-P含量分别为49.2、77.9和92.1 mg kg-1。3种紫色土在淹水还原条件下土壤磷环境敏感临界值比旱地低,淹水还原条件提高了紫色土磷向水体释放的风险。淹水土壤Olsen-P含量与田表水TP、DP浓度之间存在"临界值",酸性、中性和钙质土临界值处土壤Olsen-P含量分别为(65±1.41)mg kg-1(、96.7±2.7)mg kg-1和(105.5±1.1)mg kg-1。土壤0.01 mol L-1 CaCl2-P与田表水TP、DP之间呈极显著的线性关系。可以利用这些指标对紫色土区域土壤磷环境风险进行评价,并确定区域磷肥的最佳管理策略。
|
| 关 键 词： | 紫色土 Olsen-P CaCl2-P 临界值 |
Environmental Risk Assessment about Purple Soil Phosphorus Loss-Its Phosphorus Change-point |
| |
| LI Xue-ping ,SHI Xiao-jun ,LIU Ping ,SUI Tao.Environmental Risk Assessment about Purple Soil Phosphorus Loss-Its Phosphorus Change-point[J].Chinese Journal of Soil Science,2011(5):1153-1158. |
| |
| Authors: | LI Xue-ping SHI Xiao-jun LIU Ping SUI Tao |
| |
| Institution: | LI Xue-ping 1,2,SHI Xiao-jun 2,LIU Ping 1,SUI Tao 1(1.Department of City and Environment,Binzhou university,Binzhou 256600,China,2.College of Resources and Environment,Southwest University,Chongqing 400716,China) |
| |
| Abstract: | The indoor experiment was conducted on three types of purple soils.The environmental threshold of soil phosphorus loss was studied in dry and paddy fields.The results showed that,whether it was rice or dry land habitat,three kinds of purple soil Olsen-P and CaCl2-P existed between a change-point.Three kinds of purple soil phosphorus leaching thresholds varied greatly.Acid,neutral and calcareous purple soil phosphorus leaching critical point of the Olsen-P contents were respectively 67.2,85.8,and 113.8 mg kg... |
| |
| Keywords: | Purple soil Olsen-P CaCl2-P Change-point |
| 本文献已被 CNKI 等数据库收录！ |
|
