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[1]CAO Wei,GAO Yun-fei,LI Zhi-guang,et al.Quantitative Calculation of Biological-control Factor in Helong Region[J].Research of Soil and Water Conservation,2012,19(04):96-100.

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Quantitative Calculation of Biological-control Factor in Helong Region

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 19 Number of periods: 2012 04 Page number: 96-100 Column: Public date: 2012-08-20

Title:: Quantitative Calculation of Biological-control Factor in Helong Region

Author(s):: CAO Wei^1,2, GAO Yun-fei², LI Zhi-guang³, YANG Sheng-tian⁴, CAO Yong⁵; 1. Beijing Forestry University, Beijing 100875, China;
2. Monitoring Center of Soil and Water Conservation and Ecological Environment of Yellow River, Xi’an 710021, China;
3. The Monitoring Center of Soil and Water Conservation, MWR, Beijing 100055, China;
4. School of Geography, Beijing Normal University, Beijing 100875, China;
5. Suide Governs the Surveillance Bureau of Yellow River Conversation of Soil and Water, Suide, Shaanxi 718000, China

Keywords:: Helong region; biological-control factor; vegetation coverage; rainfall erosivity

CLC:: Q948

DOI:: -

Abstract:: 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.

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