河龙区间植物措施因子定量计算  

Quantitative Calculation of Biological-control Factor in Helong Region

作　　者：曹炜[1,2] 高云飞[2] 李智广[3] 杨胜天[4] 曹勇[5] 

机构地区：[1]北京林业大学,北京100083 [2]黄河水土保持生态环境监测中心,西安710021 [3]水利部水土保持监测中心,北京100055 [4]北京师范大学地理学与遥感科学学院,北京100875 [5]黄河水土保持绥德治理监督局,陕西绥德718000

出　　处：《水土保持研究》2012年第4期96-100,共5页Research of Soil and Water Conservation

基　　金：中华人民共和国国务院第一次全国水利普查项目

摘　　要：为解决区域植物措施(B)因子的计算问题,以河龙区间为研究区,通过计算半月降雨侵蚀力确定了主要侵蚀性降雨季,应用MODIS NDVI产品提取了半月植被覆盖度,得到侵蚀性降雨季植被覆盖度。根据已有研究成果,结合土地利用,计算了区域B因子,应用小区观测数据对植被覆盖度反演结果进行了检验。结果表明:反演与实测的植被覆盖度季节变化曲线变化趋势、值域范围基本一致。7—8月为主要侵蚀性降雨季,平均植被覆盖度达到57.23%,B因子平均值为0.345。年均降雨量与植被覆盖度成正比关系,与B因子成反比。该文采用的植物措施因子计算方法为区域土壤侵蚀监测提供参考。In order to calculate the regional biological-control（B） factor,Helong region was taken as the study area.Using MODIS NDVI product,the vegetation coverage per half month was extracted,the erosive rainfall season was determined,then the erosive rainfall season vegetation coverage was calculated.Based on existing research results and land use information,the regional factor B was calculated,and then the inversion vegetation coverage with the data of observations in unit plot was retrieved.The results showed that the inversion and observed results of the vegetation coverage of seasonal variation curve was basically the same in terms of the trend and value range.As the main erosive rainfall season appeared during July and August,the average vegetation coverage reached 57.23%,the average factor B was 0.345.The average annual rainfall was proportional to the vegetation coverage,and was inversely proportional to the B factor.In this paper,the method for calculation of biological-control factor can be used in regional soil erosion monitoring.

关 键 词：河龙区间 植物措施因子 植被覆盖度 降雨侵蚀力 

分 类 号：Q948[生物学—植物学]