天然降雨条件下典型小流域氮流失特征  

Characteristics of nitrogen loss in small watershed area during rainfall

作　　者：方楠[1] 吴春山[2] 张江山[2] 王菲凤[2] 郭树宏[2] 

机构地区：[1]福建中医学院中医系,福建福州350108 [2]福建师范大学环境科学研究所,福建福州350007

出　　处：《环境污染与防治》2008年第9期51-54,59,共5页Environmental Pollution & Control

摘　　要：为研究福州市第二水源地——山仔水库天然降雨条件下非点源污染物中氮流失特征,选取涵盖山仔水库库区主要土地利用类型的典型小流域为研究对象,对4次降雨径流的全过程进行了氮浓度测定,对降雨过程中的径流量及氮浓度随径流量的变化进行了监测研究。结果表明,总氮、硝态氮与铵态氮的浓度通常比径流量先达到峰值;土地利用类型对氮流失有明显影响,一般为水田>旱地>松竹林;氮流失以硝态氮为主(占总氮的比例在0.4159～0.5400);径流量与不同土地利用类型(松竹林、水田、旱地)的氮负荷之间存在着多项式关系,R2分别为0.9607、0.9755、0.9834。The study was performed to define the nitrogen losses in small watershed area of Shanzi reservoir, the second largest source of water for Fuzhou. Data of flows and concentrations of nitrogen species of runoffs of four recent rainfall events showed that the runoff peaked after came after the most intense rainfalls and that the peak con centrations of nitrogen species came before the runoffs peaked. The land use pattern had significant impact on nitrogen loss, following the declining order of paddy fields, sweet potatoes and pine bamboo. Most of the loss were in the form of NO^-N. The runoff and nitrogen loadings data were correlated by a polynomial formula, and the R2 values for pine bamboo, paddy fields and sweet potatoes lands were 0. 960 7,0. 975 5 and 0. 983 4,respectively.

关 键 词：天然降雨 非点源污染 氮流失 多项式回归 

分 类 号：X52[环境科学与工程—环境工程]