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	Effects of vegetation coverage and management practice on soil nitrogen loss by erosion in a hilly region of the Loess Plateau in China
	Zhang X. C. ; Shao M. A.
	2003
关键词	vegetation coverage management practice soil nitrogen loss by erosion surface runoff particle-size sediment flow
英文摘要	Soil erosion and nutrient loss due to erosion are world-wide problems. Similar to soil loss by erosion, soil nitrogen (N) loss by erosion in small catchments is affected by vegetation coverage. The practice of comprehensive management for catchments mainly by adjusting cropland, grassland and woodland areas was widely adopted to reduce soil and water loss in catchments of the Chinese Loess Plateau. Three experiments under natural and artificial rainfall conditions on N loss by erosion for a model catchment and for an actual catchment in Zhifanggou of Ansai County in China was performed to determine the relationships between comprehensive management and N loss by runoff in small catchments. The results for vegetation coverage of 60%, 40%, 20% and 0 show that runoff loss of ammonium, nitrate, and total N were 87.08, 44.31, 25.16, 13.71 kg/km(2); 85.50, 74.06, 63.95, 56.23 kg/km(2); and 0.18, 1.18, 1.98, 7.51 t/ km(2), respectively. Due to reduction in the size of cropped area on steeply sloping land, soil N loss by erosion in the catchments was decreased by 15.8% as compared with that in 1992, i.e., from 8 758.5 kg in 1992 to 7 562.2 kg in 1998. Whereas, catchments act as a filter for ammonium and nitrate in rain, the catchment filtering effects on nitrate is remarkably higher than that on ammonium. The enrichment of < 20 mum aggregate in sediment results in the enrichment of organic matter and total N in flood sediment. Greater vegetation coverage can effectively decrease soil erosion and total N loss. However, soil mineral N loss increased as vegetation coverage increased.
出处	Acta Botanica Sinica
卷	45
期	10
页	1195-1203
收录类别	SCI
语种	英语
ISSN号	0577-7496
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/22351]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Zhang X. C.,Shao M. A.. Effects of vegetation coverage and management practice on soil nitrogen loss by erosion in a hilly region of the Loess Plateau in China. 2003.

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