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FOREST RESOURCES WANAGEMENT ›› 2022›› Issue (2): 91-99.doi: 10.13466/j.cnki.lyzygl.2022.02.013

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Spatiotemporal Variations and Topographic Differentiation of Fractional Vegetation Cover in Minjiang River

GAO Qianqian1,2(), CHEN Can1,2(), LIU Hena1,2, LUO Qian1,2, LI Xia3, LIN Yongming1,2, WU Chengzhen4   

  1. 1. College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350002,China
    2. Collegiate Key Lab of Forest-Ecosystem Process and Management in Fujian,Fujian Agriculture and Forestry University,Fuzhou 350002,China
    3. Fujian Forestry Vocational & Technical College,Nanping,Fujian 353000,China
    4. College of Ecology and Resource Engineering,Wuyi University,Nanping,Fujian 354300,China
  • Received:2021-11-25 Revised:2022-03-01 Online:2022-04-28 Published:2022-06-13
  • Contact: CHEN Can E-mail:gqaoianian@126.com;canchen@fafu.edu.cn

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Abstract:

In order to reveal the influence of the complexity of the regional topography on the vegetation coverage and to provide the basis for formulating reasonable economic and environment protection strategies in the basin area,this paper used the mixed pixel decomposition method to estimate the vegetation coverage,and analyzed the temporal and spatial characteristics of vegetation coverage and the topographic differentiation characteristics of vegetation change based on the Landsat TM and Landsat OLI images of the Minjiang River Basin in Fujian Province in 2003,2009,2014 and 2019 respectively. The results showed that:1)TheFractional Vegetation Cover (FVC) in the Minjiang River Basin increased from 0.72 in 2003 to 0.81 in 2019 and the FVC in the mountainous area was better than that along lakes and rivers. 2)The basin as a whole was developing in the direction of restoration.,and the vegetation coverage grades I,II,III,and IV transformed to grade V. Except for the expansion of grade V,the area of all grades had contracted,and the contraction area was IV (0.43)> III(0.39)> II(0.36)>I(0.17).3) The vegetation coverage of flat land was the smallest.With the elevation and slope increasing,the vegetation coverage of the Minjiang River Basin increased. In the range of elevation < 377 m and slope < 30 °,the degraded area was larger than the repaired area. The stability of vegetation coverage on flat land is the lowest. The analysis showed that the vegetation coverage of Minjiang River Basinwas affected by topographic factors. When formulating vegetation restoration policies,topographic factors should be fully considered.

Key words: Minjiang River Basin, Fractional Vegetation Cover, spatial and temporal variation, topography

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