农业环境科学学报2017，Vol.36Issue(6)：1177-1185,9.DOI:10.11654/jaes.2017-0043
黄土丘陵沟壑区沟道土地整治对径流-泥沙-氮素排放影响的模拟研究
Simulation study on the effects of typical gully land consolidation on runoff-sediment-nitrogen emissions in the loess hilly-gully region
摘要
Abstract
It is necessary but difficult to evaluate the influence of gully land consolidation on water resources and water quality in the loess hilly-gully region. Through the rainfall simulation experiments in different rainfall intensities and channel land consolidation ratios, this study evaluated impacts of gully land consolidation project on surface and underground runoff, analyzed responses of gully land consolidation project on nitrogen emissions and also discussed the mechanism of gully land consolidation on precipitation distribution and nitrogen emis-sions. Results indicated that the gully land consolidation project could regulate the distribution of precipitation, intercept rainfall runoff and promote the transformation of underground runoff. The regulation level increased with the increase of gully land consolidation ratio,and the average proportions of surface runoff, soil retention and underground residence from precipitation of different rainfall intensities can be ad-justed from 62:21:17 to 45:22:33 and 27:23:50 when the gully land consolidation ratios were designed as 30%and 60%respectively. The gully land consolidation project reduced the discharge of sediment, nitrate nitrogen and ammonium nitrogen in surface runoff but with an in-creased risk of nitrate nitrogen output in groundwater runoff.The gully land consolidation with a proportion of 60%could reduce 69%~82%of sediment output, 63%~74%of ammonium nitrate output, and 31%~48%of nitrate nitrogen output in surface runoff, but increased 160%~337%of nitrate nitrogen output and had no effect on the ammonium nitrogen output in groundwater runoff.关键词
黄土丘陵沟壑区/沟道土地整治/降水转化/径流泥沙/氮素Key words
loess hilly-gully region/gully land consolidation/precipitation transformation/runoff and sediment/nitrogen分类
资源环境引用本文复制引用
孙彭成,高建恩,韩赛奇,尹燕,周媚芳,韩剑桥..黄土丘陵沟壑区沟道土地整治对径流-泥沙-氮素排放影响的模拟研究[J].农业环境科学学报,2017,36(6):1177-1185,9.基金项目
陕西省自然科学基础研究计划(2016ZDJC-20) （2016ZDJC-20）
陕西省科技统筹创新工程项目(2013KTDZ03-03-01) （2013KTDZ03-03-01）
国家自然科学基金项目(41371276, 51309194) （41371276, 51309194）
西北农林科技大学博士科研启动基金(2452015337) （2452015337）
中国科学院知识创新工作程专项(A315021615) Natural Science Foundation of Shaanxi Province , China(2016ZDJC-20) （A315021615）
Science and Technology Innovation Program of Shaanxi Province,China(2013KTDZ03-03-01) （2013KTDZ03-03-01）
The National Natural Science Foundation of China(41371276,51309194) （41371276,51309194）
The Doctor Research Start-up Projects of NWAFU(2452015337) （2452015337）
Knowledge Innovation Project of Chinese Academy of Sciences(A315021615) （A315021615）
