农业工程学报2012，Vol.28Issue(6)：120-125,6.DOI:10.3969/j.issn.1002-6819.2012.06.020
沂蒙山区不同强降雨下土壤的氮素流失特征分析
Characteristics of soil nitrogen loss under different intense rainfalls in Yimeng mountainous area
摘要
Abstract
In order to analyze the loss characteristics of different forms of nitrogen under different natural rainfall intensities,a fixed-point experiment was conducted in Meng Lianggu basin, a typical watershed in the area of YiHe upstream located in Yimeng Mountainous area. The processes of rainfall and runoff in 2010 were observed and three typical rainfall events including the first rainstorm, a heavy rain and a heavy rainstorm were selected. Results showed that different forms of nitrogen contents presented the same increasing tend except for particulate nitrogen during the first rainstorm event of the flood season. In the heavy rain process,total nitrogen content reached the maximum before the runoff peak and dissolved nitrogen and then dissolved nitrate nitrogen contents reached the maximum. During the heavy rainstorm, total nitrogen and particulate nitrogen contents reached rapidly the maximum before the runoff peak and then declined quickly. The discharge weighted concentration of total nitrogen and particulate nitrogen increased with the rainfall intensity in the order of heavy rain<rainstorm <heavy rainstorm. Dissolved nitrogen accounted for 49.9265%-85.292% of total nitrogen loss concentration and dissolved nitrate nitrogen played a dominated role in dissolved nitrogen. Furthermore, the average loss rates of nitrogen and sediment were both declined with the rainfall intensity decreasing in the order of heavy rainstorm>rainstorm>heavy rain. The research could provide a basis for the protection of water environment and the control of non-point pollution of typical watersheds in Yimeng Mountainous area.关键词
氮/降雨/径流/流失/沂蒙山区Key words
nitrogen/ rain/ runoff/ losses/ Yimeng mountainous area分类
农业科技引用本文复制引用
井光花,于兴修,刘前进,李振炜..沂蒙山区不同强降雨下土壤的氮素流失特征分析[J].农业工程学报,2012,28(6):120-125,6.基金项目
教育部新世纪优秀人才支持计划项目(NCET-08-0877) （NCET-08-0877）
水利部淮委科技项目(SBJ2010003)和临沂市重大科技项目(201011019) （SBJ2010003）
