Study on Environmental Risk and Economic Benefits of Rotation Systems in Farmland of Erhai Lake Basin  

作　　者：TANG Qiu-xiang REN Tian-zhi Wilko Schweers LIU Hong-bin LEI Bao-kun LIN Tao ZHANGGui-long 

机构地区：[1]Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R. China [2]Institute of Agriculture Environmental Resources Research, Yunnan Academy of Agricultural Sciences, Kunming 650205, P.R.China [3]Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, P.R.China [4]Xinjiang Academy of Agricultural Sciences, Urumqi 830043, P.R.China

出　　处：《Journal of Integrative Agriculture》2012年第6期1038-1047,共10页农业科学学报（英文版）

基　　金：funded by the National Water Special Program of China during 11th Five-Year Plan period(2008ZX07105-002)

摘　　要：This study was designed to find out an optimised planting system of reducing non-point （source） pollution by analyzing the reasons and the factors of influence non-point pollution in farmland of Erhai Lake basin. The results showed that incomes, residual nitrogen in soil, and the loss of nitrogen in surface water in rice-garlic system were higher than those in rice-fava bean system. There were positive correlations between the nitrogen loss of farmland, nitrogen inputs, residual nitrogen in soil, and incomes of farmland. Economic benefits and environment benefits are both appropriate, if the area of rice-garlic system would be reduced to 53% and the area of rice-fava bean system increased to 36% of total cropping area in the investigated watershed. Adjustment of planting structure and introduction of reasonable rotation systems is considered an effective measure of controlling agricultural non-point pollution in watersheds of Erhai Lake.This study was designed to find out an optimised planting system of reducing non-point （source） pollution by analyzing the reasons and the factors of influence non-point pollution in farmland of Erhai Lake basin. The results showed that incomes, residual nitrogen in soil, and the loss of nitrogen in surface water in rice-garlic system were higher than those in rice-fava bean system. There were positive correlations between the nitrogen loss of farmland, nitrogen inputs, residual nitrogen in soil, and incomes of farmland. Economic benefits and environment benefits are both appropriate, if the area of rice-garlic system would be reduced to 53% and the area of rice-fava bean system increased to 36% of total cropping area in the investigated watershed. Adjustment of planting structure and introduction of reasonable rotation systems is considered an effective measure of controlling agricultural non-point pollution in watersheds of Erhai Lake.

关 键 词：watershed management Erhai Lake FARMLAND crop rotation environmental risk economic benefits 

分 类 号：X171[环境科学与工程—环境科学] TV213[水利工程—水文学及水资源]