陕西师范大学学报（自然科学版）Issue(3)：86-92,7.DOI:10.15983/j.cnki.jsnu.2015.03.433
基于137Cs 示踪和 WaTEM／SEDEM 模型的黑土区小流域侵蚀产沙模拟
Modeling soil erosion and sediment yield in a small catchment of the black soil region using 137Cs technique and WaTEM/SEDEM
摘要
Abstract
Severe erosion of black soil in Northeastern China has attracted great attention,and more work on soil erosion and soil conservation have been conducted in recent years.However, few studies on physical erosion modeling in this region have been conducted.In the study,24 reservoir catchments in Baiquan county were selected as study objects,and the 137 Cs technique was successfully combined with a soil erosion model WaTEM/SEDEM (Water and Tillage Erosion Model and Sediment Delivery Model).The 137 Cs-derived soil erosion intensities were used as input data to run and calibrate the WaTEM/SEDEM model firstly,and then the model was validated using the sediment yields from the 24 reservoir catchments.Soil erosion intensity in the cultivated lands is the highest,averaging 24.5 t/(hm2 ·a),and the mean erosion intensities in shrub and grass lands are 5.6 and 9.5 t/(hm2 ·a),respectively.The mean erosion intensity in forest lands is the minimum.The optimal combination of the minimum and maximum K tc values of WaTEM/SEDEM was 4 m and 8 m,with the highest c NS (Nash-Sutcliffe coefficient)of 0.62. The calibrated model has a robust modeling capacity,and the correlation coefficients of the modeled sediment yield(Y S )and the specific sediment yield(Y SS )and the observed counterparts are both over 0.70 for the 24 reservoir catchments.This study can provide scientific basis for soil erosion study and conservation measures implemented in the black soil region and other similar regions.关键词
黑土区/土壤侵蚀/核素示踪/模型/模拟Key words
black soil region/soil erosion/nuclear tracing/model/modeling分类
农业科技引用本文复制引用
李国强,方海燕..基于137Cs 示踪和 WaTEM／SEDEM 模型的黑土区小流域侵蚀产沙模拟[J].陕西师范大学学报（自然科学版）,2015,(3):86-92,7.基金项目
国家自然科学基金资助项目 （）
