干旱区生态环境知识资源中心(Arid): 华北半干旱区2个农业流域地表氮素流失特征的对比研究

Arid

	华北半干旱区2个农业流域地表氮素流失特征的对比研究
其他题名	Comparison of Nitrogen Loss via Surface Runoff from Two Agricultural Catchments in Semi-arid North China
	陆海明; 尹澄清; 王夏晖; 邹鹰
来源期刊	环境科学
ISSN	0250-3301
出版年	2008
卷号	29 期号:10 页码:2689-2695
中文摘要	在2004和2005年2个水文年期间,通过野外降雨径流监测和室内分析,对位于华北半干旱地区天津市重要饮用水水源地于桥水库周边2个典型农业小流域地表径流氮素流失特征进行了对比研究。结果表明,2个农业小流域全年氮输出主要集中在6-9月；试验期间桃花寺流域41%的地表径流和52%的总氮负荷发生在2次〉60mm降雨中,曹各庄流域输出地表径流和总氮负荷较均匀地分布于不同降雨类型的降雨事件中；桃花寺流域和曹各庄流域地表径流氮素输出发生的最小降雨量分别约为20mm和10mm；曹各庄流域和桃花寺流域年均径流系数分别为0.0132和0.0016,前者为后者的8.3倍；曹各庄流域年均总氮输出量是1.048kg·（hm~2·a）~(-1),桃花寺流域年均总氮输出量是0.158kg·（hm~2·a）~(-1),前者是后者的6.6倍。2个农业流域内的微地形地貌、景观格局和迁移廊道性质的不同是造成流域氮素流失特征差异的主要原因：受长期人为活动干扰形成的复杂地形地貌结构降低了流域的降雨-产流能力；桃花寺流域地表径流氮素主要污染源（村庄）离受纳水体的距离约为1500m,而曹各庄流域此距离约为200m,较短的迁移距离增加氮素迁移到受纳水体的风险；曹各庄流域道路型的传输廊道可以很快地将地表径流氮素迁移到受纳水体,而桃花寺流域地表径流氮素则可以在传输廊道中被小石坝、植被过滤带和干塘等汇型结构所持留。
英文摘要	Nitrogen loss characteristics via surface runoff from two typical agricultural catchments into Yuqiao Reservoir-the important drinking water source area for Tianjin city in semi-arid North China were investigated through two-year in-situ monitoring and indoor chemical analysis. The results showed that annual nitrogen export mainly concentrated in the rainy period between June to September. About 41% of the annual water output and 52 % of the annual total nitrogen output took place in two rainfall events with rainfall 〉 60 mm in Taohuasi catchment （ T catchment）, while the distribution of water and nitrogen export among various rainfalls in Caogezhuang catchment （C catchment） was smooth. The rainfall thresholds for the appearance of water and nitrogen export from the outlet of T catchment and C catchment were 20 mm and 10 mm. The mean annual runoff coefficients of C and T catchments were 0.013 2 and 0.001 6, respectively. The mean annual total nitrogen exports from C catchment and T catchment were 1.048 kg·（ hm~2·a）~(-1) and 0.158 kg·（hm~2·a）~(-1) respectively. The difference of micro-topography, landscape pattern and hydrological pathway between two catchments could explain the nitrogen export gap. Micro-topographical features created by long-term anthropological disturbance decrease the runoff generation ability. The distance between nitrogen source area and the outlet in T catchment was around 1 500 m, while such distance in C catchment was just around 200 m. The short distance added the nitrogen export risk via surface runoff. Road-type hydrological pathway in C catchment could transfer nitrogen into the receiving water via surface runoff directly, while nitrogen could be detained within the pathway by many sink structures such as small stones, vegetated buffer strip and dry ponds in T catchment.
中文关键词	华北 ; 农业流域 ; 氮 ; 地表径流 ; 迁移 ; 景观格局 ; 迁移廊道
英文关键词	North China agricultural catchment nitrogen surface runoff transfer landscape pattern hydrological pathway
类型	Article
语种	中文
国家	中国
收录类别	CSCD
WOS类目	Environmental Sciences & Ecology
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:3396903
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/222526
作者单位	陆海明, 南京水利科学研究院, 水文水资源与水利工程科学国家重点实验室, 南京, 江苏 210029, 中国.; 邹鹰, 南京水利科学研究院, 水文水资源与水利工程科学国家重点实验室, 南京, 江苏 210029, 中国.; 尹澄清, 中国科学院生态环境研究中心, 环境水质学国家重点实验室, 北京 100085, 中国.; 王夏晖, 中国环境规划院, 北京 100012, 中国.
推荐引用方式 GB/T 7714	陆海明,尹澄清,王夏晖,等. 华北半干旱区2个农业流域地表氮素流失特征的对比研究[J],2008,29(10):2689-2695.
APA	陆海明,尹澄清,王夏晖,&邹鹰.(2008).华北半干旱区2个农业流域地表氮素流失特征的对比研究.环境科学,29(10),2689-2695.
MLA	陆海明,et al."华北半干旱区2个农业流域地表氮素流失特征的对比研究".环境科学 29.10(2008):2689-2695.