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林业资源管理 ›› 2022›› Issue (2): 91-99.doi: 10.13466/j.cnki.lyzygl.2022.02.013

• 科学研究 • 上一篇    下一篇

闽江流域植被覆盖度时空变化及地形分异特征

高倩倩1,2(), 陈灿1,2(), 刘贺娜1,2, 罗倩1,2, 李霞3, 林勇明1,2, 吴承祯4   

  1. 1.福建农林大学 林学院,福州 350002
    2.福建农林大学 福建省高校森林生态系统过程与经营重点实验室,福州 350002
    3.福建林业职业技术学院,福建 南平 353000
    4.武夷学院 生态与资源工程学院,福建 南平 354300
  • 收稿日期:2021-11-25 修回日期:2022-03-01 出版日期:2022-04-28 发布日期:2022-06-13
  • 通讯作者: 陈灿
  • 作者简介:高倩倩(1997-),女,浙江温州人,在读硕士,研究方向:城市林业及管理。Email: gqaoianian@126.com
  • 基金资助:
    福建省林业科技项目“风力干扰条件下福建沿海防护林森林碳库和生物量研究”(2021FKJ22)

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

摘要:

为揭示区域地形复杂性对植被覆盖度的影响以及为流域地区制定合理的经济和环保策略提供依据,以福建省闽江流域为研究区,基于Landsat TM和Landsat OLI影像,利用混合像元分解法估算了闽江流域2003,2009,2014,2019年4个时期的植被覆盖度,得到闽江流域植被覆盖度时空动态特征及植被变化地形分异特征。结果表明:1)闽江流域植被覆盖度从2003年的0.72增加到2019年的0.81,呈上升趋势,山地密集地区植被覆盖度情况优于河湖沿岸地区。2)流域整体向修复方向发展,植被覆盖度Ⅰ、Ⅱ、III、Ⅳ等级向Ⅴ等级转变,除Ⅴ等级面积扩张外,各等级面积均呈现收缩现象,收缩面积为Ⅳ(0.43)>Ⅲ(0.39)>Ⅱ(0.36)>Ⅰ(0.17)。3)平地植被覆盖度值最小,随着海拔和坡度升高闽江流域植被覆盖度增加;海拔<377m、坡度<30 °范围内,退化面积大于修复面积,平地植被覆盖度稳定性最低。通过分析可知,闽江流域植被覆盖度受地形因子的影响,制定植被修复政策时,需充分考虑地形因素。

关键词: 闽江流域, 植被覆盖度, 时空变化, 地形

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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