| 摘要: |
| 【目的】分析2000-2009年陕西省植被覆盖的时空变化规律，为区域人地关系协调发展和生态建设政策的制定与实施提供理论依据。【方法】在对2000-2009年MODIS NDVI数据进行时序重建的基础上，采用最大值合成法、差值法获取NDVI时空变化信息，并结合DEM分级数据提取不同高程地区的NDVI变化信息，分析陕西省植被覆盖情况的时空变化规律。【结果】1) 陕西省植被覆盖空间分布存在明显的地域特征，表现为NDVI值陕南秦巴山区＞关中平原区＞陕北黄土高原区。2000-2009年陕西省植被覆盖呈现改善趋势，植被覆盖变化速率表现为陕北黄土高原区高于关中平原区，关中平原区高于陕南秦巴山区。2) 陕北黄土高原区不同高程地区，植被覆盖以明显增加为主。关中平原区高程＜500 m地区的城市附近区域，植被覆盖表现为严重退化。陕南秦巴山区高程＜500 m与高程＞1 500 m地区，植被覆盖表现为轻微减少，而500 m≤高程≤1 250 m地区，植被覆盖明显增加。3) 2000-2009年，陕西省植被覆盖增加地区面积占全省总面积的27.8%，减少地区面积占17.0%。【结论】2000-2009年，陕北黄土高原区植被覆盖增加，是国家退耕还林还草工程实施效果的体现；关中平原区受城市化影响较大，城市周围植被覆盖出现严重退化；陕南秦巴山区植被覆盖较高，并保持稳定。 |
| 关键词: MODIS NDVI 植被覆盖变化 高程 陕西省 |
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| 基金项目:国家林业公益性行业科研专项（201304309） |
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| Analysis of vegetation cover change in Shaanxi province based on MODIS NDVI |
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| Abstract: |
| 【Objective】Spatial and temporal vegetation cover change analyzed in Shaanxi province during 2000-2009,were studied in order to provide a theoretical reference for regional sustainable development and ecological policy-making.【Method】Based on the reconstruction of MODIS NDVI time-series data from 2000 to 2009,the information of NDVI change was obtained under the help of MVC and difference methods,while the information of NDVI change based on the divided of DEM also was obtained at the same time,for analysis of spatial-temporal change of vegetation cover change in Shaanxi province.【Results】1) Spatial vegetation cover had regional characteristics in Shaanxi,which show Qin-Ba mountain area in the south of Shaanxi vegetation cover is better than Guanzhong plain area in the middle of Shaanxi,and Guanzhong plain area is better than the Loess Plateau area in the north of Shaanxi.During 2000 to 2009,vegetation cover in Shaanxi was mainly increased.As far as the raised rate,Loess Plateau area was higher than Guanzhong plain area,which higher than Qin-Ba mountain area.2) In different elevation area,Loess Plateau area showed vegetation cover increased obviously.Nearby urban area,where elevation＜500 m,showed decreased seriously in Guanzhong plain area.In the range of ＜500 m and ＞1500 m,vegetation cover decreased lightly,while in range of 500-1 250 m,vegetation cover in some area increased obviously.(3) During 2000-2009,the increased area of vegetation cover in Shaanxi accounted for 27.8%,while the decreased area accounted for 17.0%.【Conclusion】During 2000-2009,vegetation cover in Loess Plateau area in the north of Shaanxi increased under the influence of returning farmland to forest and grass policy,while vegetation cover nearby urban in Guanzhong plain area decreased significantly affected by urbanization,as well as vegetation cover in Qin-Ba mountain area was stable. |
| Key words: MODIS NDVI vegetation cover change elevation Shaanxi province |
