水田土肥流失特征的初步研究  

Priliminary Study on Loss of Soil and Nutrients of Paddy Field by Drainage

作　　者：章明奎[1] 姜宏[1] 

机构地区：[1]浙江大学土壤农业化学系,杭州310029

出　　处：《水土保持学报》1999年第S1期21-23,60,共4页Journal of Soil and Water Conservation

基　　金：国家自然科学基金

摘　　要：水田土壤的排水主要发生在水稻生长的５～１０ 月，泥沙流失和养分流失也主要出现在这一时期。据测定，５～１０ 月泥沙和养分的流失量约占全年流失总量的８５％ 以上，排水中泥沙含量和养分含量也是５～１０月大于其它月份。稻田排水中泥沙和养分含量与土壤性质有关，肥力较高的土壤，Ｎ，Ｐ，Ｋ的流失量也较高。Drainage of paddy field was mainly occurred May to October,duration of rice growth,loss of soil and nutrients also mainly appeared in this period.The results showed that loss of soil and nutrient(N,P,K)by drainage from May to October was more than 85% of whole year,and concentration of soil and nutrient in drainage from May to October was much higher than that of other months,the concentration of soil and nutrient in drainage was varied with soil properties and season,N,P and K concentration in drinage was increased with soil fertility.

关 键 词：养分流失 排水 水田 

分 类 号：S158.3[农业科学—土壤学]