长江流域资源与环境 >> 2019, Vol. 28 >> Issue (02): 440-449.doi: 10.11870/cjlyzyyhj201902020

• 生态环境 • 上一篇    下一篇

卧龙自然保护区植被覆盖度变化及其对地形因子的响应

魏建瑛,徐建英*,樊斐斐   

  1. (首都师范大学资源环境与旅游学院,北京 100048)
  • 出版日期:2019-02-20 发布日期:2019-02-25

Changes of Vegetation Coverage and Their Response to Topographical Factors in Wolong Nature Reserve

WEI Jian-ying, XU Jian-ying, FAN Fei-fei

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  1. (Collage of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China)
  • Online:2019-02-20 Published:2019-02-25

摘要: 通过像元二分模型在NDVI数据基础上,估算了卧龙自然保护区2000和2015年的植被覆盖度,分析了这15年间研究区域植被覆盖的变化及空间分异特征,初步揭示了植被覆盖变化与地形因子的响应关系。结果表明:(1)2000~2015年间卧龙自然保护区植被覆盖度整体良好,以中高和高植被覆盖为主,空间格局上呈现东南高、西北低的总体趋势。(2)研究时段内高覆盖度面积明显减少,而其他覆盖等级面积存在不同程度的增加,植被覆盖度均值降低。(3)研究区域各海拔范围内均以植被稳定类型为主,低海拔和高海拔地区植被退化显著,在1 500~3 250 m的高程范围内植被稳定和植被改善相对显著。(4)研究区不同坡度间植被变化类型差异不明显;不同坡向上植被变化显著,其中阳坡的植被退化分布,阴坡的植被改善分布明显,随着坡向由阴坡转阳坡,植被退化增加,改善减少。其结论有助于揭示卧龙自然保护区植被覆盖的时空变化特征,对保护区生态环境评价和改进具有重要的参考价值,同时对保护区的管理和植被恢复有一定借鉴意义。

Abstract: Based on dimidiate pixel model, we estimated the Fractional vegetation coverage(FVC) of Wolong Nature Reserve in 2000 and 2015 respectively and explored changes of vegetation coverage in the fifteen years. Furtherly, spatial characteristics of vegetation cover changes were analyzed and their responses to topographical factors were revealed. The results showed that:(1)The vegetation coverage of Wolong Nature Reserve was generally good in both 2000 and 2015. Most of the regions were covered with high vegetation coverage. The overall spatial pattern showed a trend of high in the southeast and low in the northwest.(2) The area of high coverage during the study period reduced significantly, while other coverage level areas increased with different extent, and the average coverage of vegetation decreased a little.(3) Three types of vegetation coverage changes were established in the study, i.e. stability, degradation and improvement. It was found that type of stability distributed dominantly in all elevation ranges. In the case of their spatial distribution, type of degradation was relatively significant in both low and high altitude areas, while types of stability and improvement were relatively significant in the elevation range of 1 500-3 250 m.(4) An obvious change in vegetation coverage was found among varied aspects. The vegetation coverage degraded on the sunny slope and improved on the shady slope. The study explored the spatial distribution and variation characteristics of vegetation coverage in Wolong Nature Reserve, which has important reference value for both evaluation of local ecological environment and vegetation restoration in the reserve management. 


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