豫西地区植被覆盖的空间变化研究

Study on Vegetation Coverage Space Change of Henan Western Mountain Area

应用遥感技术,利用长时间序列的SPOT VEGETATION NDVI数据集,结合改进的像元二分模型,对豫西山区1998年、2003年和2008年的植被覆盖度进行计算。结果表明,豫西山区植被覆盖总体上略有上升,局部地区植被覆盖度有所下降。高海拔区域植被覆盖相对稳定,退化概率较低;低海拔区域植被退化和恢复的概率都相对较高;坡度小的区域植被退化和修复的概率都较高;坡度较大的区域植被轻微退化概率增大,坡度越大,植被覆盖修复的概率越低;南坡和北坡植被覆盖度相对较高,东坡和西坡植被覆盖度较低;西南坡向的植被退化相对严重,东南坡向植被退化概率相对较低。

This paper chose the SPOT VEGETATION NDVI dataset as data source,used the improved pixel binary model,calculated the vegetation coverage of the year 1998,2003 and 2008,then combined with the DEM,slope and aspect data of Western Mountain Area of Henan Province,as well as quantitatively researched the vegetation coverage of this area.The result showed that：①The vegetation coverage of Western Mountain Area of Henan showed the rise trend.②The vegetation coverage showed a downtrend because of large-scale land-use.③The vegetation coverage in high altitude areas was steady-going,the probability of stable and recover was relatively high,and the degradation probability was lower.But in the low altitude areas,the change of vegetation coverage was very shrewd,and the probability of degradation and recover both was relative high.④In the small slope areas,the probability of degradation and recover both was relative high.In the steep area,the degradation probability grew higher,and the slope was higher,the recover probability was lower.⑤The vegetation coverage in south and north aspect was relatively high and it was lower in east and west aspect.The vegetation degradation in west-south aspect was more seriously than in east-south aspect.