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[1]ZHAO Wenhui,CHEN Ni,YAN Rui,et al.Study on Variation of the Vegetation Coverage Based on Terrain Factors in the Beiluo River Basin in the Past 20 Years[J].Research of Soil and Water Conservation,2016,23(04):10-14.

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Study on Variation of the Vegetation Coverage Based on Terrain Factors in the Beiluo River Basin in the Past 20 Years

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 04 Page number: 10-14 Column: Public date: 2016-04-28

Title:: Study on Variation of the Vegetation Coverage Based on Terrain Factors in the Beiluo River Basin in the Past 20 Years

Author(s):: ZHAO Wenhui^1,3, CHEN Ni^1,2, YAN Rui^1,3, ZHANG Xiaoping³; 1. College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing University, Nanjing 210093, China;
3. Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China

Keywords:: vegetation restoration; terrain factors; spatiotemporal variations; Beiluo River Basin

CLC:: S127;P208

DOI:: -

Abstract:: Based on the 1987, 1995 and 2007 Landsat TM image data, combining with terrain factors extracted from DEM, trend of vegetation restoration and their distribution characteristics on the terrain were analyzed to provide basic information for watershed ecological construction and benefit evaluation in the region. Vegetation fraction was estimated using Normalized Deviation Vegetation Index derived from Remote Sensing Image and the Pixel Dichotomy Model. The results showed that ninety percent of the area in the basin was the hilly-gully and the table-gully regions; sixty-seven percent of the area was the slope with the gradients ranging from 8° to 25°; the area of the four slope aspects was almost equal. The average vegetation coverage in the basin increased from 41.1% in 1987 and 45.4% in 1995 to 63.4% in 2007 while it had a slight increase in 1995 compared with 1987 in the spectrum of slope degree, aspect, elevation, the vegetation distribution pattern was basically consistent. The vegetation coverage in 2007 increased significantly in the terrain spectrum, especially in the area with altitudes ranging from 900 m to 1 300 m, and gradient less than 35° and the sunny slope aspect.

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