中国水土保持科学2025，Vol.23Issue(1)：193-199,7.DOI:10.16843/j.sswc.2022207
流域泥沙入河负荷辨识方法
Identification methods of sediment export load from watershed
摘要
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 1 672.63%,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.关键词
次降雨/泥沙入河负荷/监测/7Be示踪/RUSLE模型/CSSIKey words
single rainfall/sediment export load/monitoring/7Be tracer/RUSLE model/CSSI分类
农业科技引用本文复制引用
杨翠红,王旭,郭豪,李勇,陈婷婷,黄智刚,周小淇,吴宗猛,杨江怡..流域泥沙入河负荷辨识方法[J].中国水土保持科学,2025,23(1):193-199,7.基金项目
国家自然科学基金"'退桉还蔗'下南亚热带蔗区小流域生态系统碳储量及土壤有机碳演变机制研究"(42477042),"湿热区土壤水蚀面源污染对垦殖强度的响应:中缅泰对比研究"(42220104004) （42477042）
