流域泥沙入河负荷辨识方法

doi:10.16843/j.sswc.2022207

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Abstract Background The sugarcane planting area expanded to the hilly land, which intensified the soil erosion intensity in the sugarcane plantation area of Guangxi. Driven by rainfall and runoff, eroding sediment and nutrients into the water, causing serious environmental pollution. However, there are few methods to determine the eroded sediment from sugarcane fields into river. Therefore, determining the appropriate method to the eroding sediment export load from sugarcane fields, which is of great significance to control soil erosion and select the reasonable soil and water conservation measures in sugarcane growth regions. Methods In this study, a small sugarcane growing watershed in Guangxi was selected to determine the proportion of sugarcane eroding sediment contribution based on Compound Specific Stable Isotopes (CSSI). Soil loss were determined by field monitoring, ⁷Be tracer technique and RUSLE model under three heavy rainfall events during the early sugarcane planting period in 2020-2021. Sediment export load from sugarcane land were estimated by combinative use of field monitoring, ⁷Be tracer technique, RUSLE model and CSSI techniques, respectively. Results 1) Eroding sediment from sugarcane land contributed 24.5% to 42.8% in Nala watershed, which was one of the main source of sediment into the river. 2) Soil loss measured by the three methods ranged from 0.18 to 5.57 t/hm² under single rainfall event in the order of ⁷Be technique > RUSLE > Monitoring. 3) Sediment export load from sugarcane was between 0.04 and 1.07 t/hm² determined by Monitoring-CSSI method. Compared with the results of Monitoring-CSSI method, the relative error of ⁷Be-CSSI method was 2.74% to 1672.63%, Nash-Sutcliffe (E) coefficient was –1.47. The relative error of RUSLE-CSSI method ranged from –16.42% to 208.41%, and E value was 0.8. Conclusions Compared with the export load from sugarcane land measured by monitoring-CSSI method, the results of ⁷Be-CSSI method and RUSLE-CSSI method both have large error. Thus, those two methods are unsuitable for determining sediment export load from watershed.

Key words： single rainfall sediment export load monitoring ⁷Be tracer RUSLE model CSSI

Received: 20 October 2022

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S157A

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	Articles by authors
	YANG Cuihong
	WANG Xu
	GUO Hao
	LI Yong
	CHEN Tingting
	HUANG Zhigang
	ZHOU Xiaoqi
	WU Zongmeng
	YANG Jiangyi

Cite this article:

YANG Cuihong,WANG Xu,GUO Hao, et al. Identification methods of sediment export load from watershed[J]. SSWC, 2025, 23(1): 193-199.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2022207 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2025/V23/I1/193

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