基于AnnAGNPS模型的黄土高原小流域土壤侵蚀定量评价  

Soil erosion quantitative evaluation of small watershed in Loess Plateau based on AnnAGNPS model

作　　者：贾宁凤[1] 段建南[2] 李保国[3] 李旭霖[4] 陈焕伟[1] 

机构地区：[1]山西大学经济与工商管理学院,太原030006 [2]湖南农业大学资源环境学院,长沙410128 [3]中国农业大学资源和环境学院,北京100094 [4]莱阳农学院农学系,莱阳265200

出　　处：《农业工程学报》2006年第12期23-27,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金重大项目(39990490);国家自然科学基金(49971040)

摘　　要：以位于黄土丘陵沟壑区的砖窑沟流域为试点,利用A nnAGNPS模型进行土壤侵蚀定量评价。采用流域8次径流事件监测数据进行模型检验,径流量和沉积物量的相对误差分别为10%和-10%,A nnAGNPS模型能够比较理想地模拟流域长期的径流量和沉积物量,并可应用于黄土丘陵沟壑区的径流流失和土壤侵蚀定量评价。采用2004年土地利用状况模拟分析了流域土壤侵蚀量及其空间分布,结果表明:该流域平均片蚀和细沟侵蚀强度为3508 t/(km2.a),属中度侵蚀等级,黄土沟壑地的平均侵蚀强度最大,属极强度侵蚀等级;严重的沟道侵蚀显著增加了运移到流域出口的泥沙。The Annualized Agricultural Non-Point Source Pollution model（AnnAGNPS） was used to evaluate soil erosion of Zhuanyaogou watershed in the hilly area of loess Plateau in China. Results show that the relative errors of runoff and sediment yield are 10% and -10% using monitoring data of eight times runoff events, respectively. AnnAGNPS model provides reasonable estimation result of long-term annual runoff and sediment yield. AnnAGNPS model is suitable for quantitative evaluating runoff losses and soil erosion in the hilly area of Loess Plateau. Therefore, the soil erosion of small watershed was simulated based on the land use pattern in 2004 and the spatial distribution of soil erosion were analyzed. The average sheet and rill erosion intensity is 3508 t/（km^2·a）, which belongs to moderate erosion. Average gully erosion intensity belongs to intensive erosion, which is distinctly higher than that of other land use types. Because there is serious gully erosion, the sediment loading of watershed outlet is obviously added.

关 键 词：ANNAGNPS模型 黄土丘陵沟壑区 径流量 沉积物量 

分 类 号：S157.1[农业科学—土壤学]