Effects of cultivation and reforestation on suspended sediment concentrations: a case study in a mountainous catchment in China

doi:10.5194/hess-20-13-2016

	Effects of cultivation and reforestation on suspended sediment concentrations: a case study in a mountainous catchment in China
	Fang, N. F.1,2; Chen, F. X.3; Zhang, H. Y.1,2; Wang, Y. X.1,2; Shi, Z. H.2,3
刊名	HYDROLOGY AND EARTH SYSTEM SCIENCES
	2016
卷号	20 期号:1 页码:13-25
ISSN号	1027-5606
DOI	10.5194/hess-20-13-2016
通讯作者	Shi, Z. H.(shizhihua70@gmail.com)
英文摘要	Understanding how sediment concentrations vary with land use/cover is critical for evaluating the current and future impacts of human activities on river systems. This paper presents suspended sediment concentration (SSC) dynamics and the relationship between SSC and discharge (Q) in the 8973 km(2) Du catchment and its sub-catchment (4635 km(2)). In the Du catchment and its sub-catchment, 4235 and 3980 paired SSC-Q samples, respectively, were collected over 30 years. Under the influence of the Household Contract Responsibility System and Grain-for-Green projects in China, three periods were designated, the original period (1980s), cultivation period (1990s) and reforestation period (2000s). The results of a Mann-Kendall test showed that rainfall slightly increased during the study years; however, the annual discharge and sediment load significantly decreased. The annual suspended sediment yield of the Du catchment varied between 1.3 x 10(8) and 1.0 x 10(10) kg, and that of the sub-catchment varied between 6.3 x 10(7) and 4.3 x 10(9) kg. The SSCs in the catchment and sucatchment fluctuated between 1 and 22400 gm(-3) and between 1 and 31800 gm(-3), respectively. The mean SSC of the Du catchment was relatively stable during the three periods (+/- 83 gm(-3)). ANOVA (analysis of variance) indicated that the SSC did not significantly change under cultivation for low and moderate flows, but was significantly different under high flow during reforestation of the Du catchment. The SSC in the sub-catchment was more variable, and the mean SSC in the sub-catchment varied from 1058 +/- 2217 gm(-3) in the 1980s to 1256 +/- 2496 gm(-3) in the 1990s and 891 +/- 1558 gm(-3) in the 2000s. Reforestation significantly decreased the SSCs during low and moderate flows, whereas cultivation increased the SSCs during high flow. The sediment rating curves showed a stable relationship between the SSC and Q in the Du catchment during the three periods. However, the SSC-Q of the sub-catchment exhibited scattered relationships during the original and cultivation periods and a more linear relationship during the reforestation period.
资助项目	National Natural Science Foundation of China[41525003] ; National Natural Science Foundation of China[41301294] ; Fundamental Research Funds for the Central Universities[2014YB053]
WOS关键词	LAND-USE CHANGES ; SOIL-EROSION ; WATERSHED SCALE ; REGIONAL SCALES ; YELLOW-RIVER ; YIELD ; RUNOFF ; BASIN ; IMPACT ; GENERATION
WOS研究方向	Geology ; Water Resources
语种	英语
出版者	COPERNICUS GESELLSCHAFT MBH
WOS记录号	WOS:000369668400002
资助机构	National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/67507]
专题	中国科学院地理科学与资源研究所
通讯作者	Shi, Z. H.
作者单位	1.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Peoples R China 2.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Yangling 712100, Peoples R China 3.Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Peoples R China
推荐引用方式 GB/T 7714	Fang, N. F.,Chen, F. X.,Zhang, H. Y.,et al. Effects of cultivation and reforestation on suspended sediment concentrations: a case study in a mountainous catchment in China[J]. HYDROLOGY AND EARTH SYSTEM SCIENCES,2016,20(1):13-25.
APA	Fang, N. F.,Chen, F. X.,Zhang, H. Y.,Wang, Y. X.,&Shi, Z. H..(2016).Effects of cultivation and reforestation on suspended sediment concentrations: a case study in a mountainous catchment in China.HYDROLOGY AND EARTH SYSTEM SCIENCES,20(1),13-25.
MLA	Fang, N. F.,et al."Effects of cultivation and reforestation on suspended sediment concentrations: a case study in a mountainous catchment in China".HYDROLOGY AND EARTH SYSTEM SCIENCES 20.1(2016):13-25.