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紫色土小流域土壤及氮磷流失特征研究
引用本文:韩建刚,李占斌,钱程.紫色土小流域土壤及氮磷流失特征研究[J].生态环境,2010,19(2):423-427.
作者姓名:韩建刚  李占斌  钱程
作者单位:1. 江苏大学环境学院,江苏,镇江,212013
2. 中国科学院水利部水土保持研究所//黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西,杨凌,712100;西安理工大学水利水电学院,陕西,西安,710048
基金项目:国家自然科学基金项目,中国博士后科学基金项目,江苏省博士后科研资助计划项目,江苏省高校自然科学基础研究面上项目,中欧合作研究项目,江苏大学科研立项 
摘    要:紫色土区土壤及其养分流失对长江水环境产生严重威胁。然而,有关该地区自然降雨侵蚀下土壤及氮磷流失规律的研究却较为少见。以紫色土农田利用为主小流域为研究对象,监测自然降雨侵蚀下土壤及其氮磷的流失过程,以期服务于流域尺度土壤及养分流失的模拟与控制。结果表明,次降雨径流含沙量与流量的变化基本同步,峰值含沙量往往出现在峰值流量处或略有提前,此后,含沙量迅速降低。硝态氮流失浓度与流量的变化成反比,峰值流量处流失浓度一般达到最低,此后,随着流量的降低,其流失浓度存在较为明显的升高过程。铵态氮与水溶性磷的流失表现为剧烈波动的变化特征。氮素流失的主要形态是硝态氮,其占到次降雨无机氮流失总量的88%~97%。

关 键 词:紫色土  土壤流失  硝态氮  铵态氮  水溶性磷

Nitrogen,phosphorous and soil losses by runoff in a farmland-dominated watershed in purple soil region
HAN Jiangang,LI Zhanbin,QIAN Cheng.Nitrogen,phosphorous and soil losses by runoff in a farmland-dominated watershed in purple soil region[J].Ecology and Environmnet,2010,19(2):423-427.
Authors:HAN Jiangang  LI Zhanbin  QIAN Cheng
Institution:HAN Jiangang1,LI Zhanbin2,3,QIAN Cheng1 1.School of the Environment,Jiangsu University,Zhenjiang 212013,Jiangsu,China,2.Institute of Soil , Water Conservation,CAS & MWR,Yangling 712100,Shaanxi,3.Xi\'an University of Technology,Xi\'an 710048
Abstract:Soil and nutrient losses from purple soils have been reported to increase pollution of the Yangtze River.However,few studies addressed their concentration variations in runoff under natural rainstorms.Soil,nitrogen and phosphorous losses by runoff were investigated in a farmland-dominated watershed in the purple soil regions for the purpose of erosion control and simulation.The peak sediment concentrations generally preceded or occurred simultaneously with their peak runoff rates for most of runoff events.S...
Keywords:purple soil  soil loss  nitrate nitrogen  ammonia nitrogen  dissolved reactive phosphorus
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