摘要
[目的]探索大通县植被变化规律。[方法]基于Landsat TM卫星遥感影像数据,通过ArcGIS10.0与ENVI5.1软件,提取并分析了大通县不同时期的植被覆盖度时空变化总体特征及其变化原因,并结合大通县DEM数据提取地形因子,研究了不同海拔对植被覆盖度变化的影响。[结果]大通县2000年、2005年、2010年、2014年的平均植被覆盖度依次为73.57%、67.53%、56.13%、69.18%,植被覆盖度fc>0.65的区域和植被覆盖度稳定区的面积占总面积的比例均达到60%以上,植被覆盖总体情况良好;随着海拔的上升,植被覆盖度总体上呈现出先增加后减少的趋势,海拔高度低于3 500m的地带,中高与高等植被覆盖度占比在40%以上,但随着海拔的升高,植被覆盖度下降明显。[结论]引起大通县植被覆盖度动态变化的主要原因是社会经济政策与人类活动的共同影响,有效的政策引导以及森林生态安全屏障的构筑是大通县植被覆盖度提高的主要因素。
[Objective]In order to study the vegetation changes in Datong county.[Methods]based on the US Landsat TM satellite remote sensing data,and through ArcGIS10.0and ENVI 5.1software,extracted and analyzed the spatial and temporal variation of vegetation coverage characteristics and reasons for the changes overall Datong county in different periods,combined with the DEM terrain data extraction factor,we studied the effects of altitude on different vegetation coverage change.[Results]The results showed that：the average vegetation coverage in 2000,2005,2010,2014 in Datong county were 73.57%,67.53%,56.13%,69.18%,the area of vegetation coverage regional and vegetation coverage stable region over 0.65,reached more than 60%.The vegetation coverage was in good condition,with increasing altitude,the vegetation coverage showing the overall downward trend after the first increase,less than3500 maltitude zone,high and higher vegetation coverage accounting for more than 40%,but with increasing elevation,vegetation coverage decreased significantly.[Conclusion]The main cause of vegetation coverage in Datong county of dynamic change was the combined effect of human activities and socio-economic policy,effective policy guidance and forest ecology build safety barrier were the major factors in Datong county of which the vegetation coverage was increased.
出处
《山西农业大学学报（自然科学版）》
CAS
2016年第10期725-734,共10页
Journal of Shanxi Agricultural University(Natural Science Edition)
基金
青海民族大学2015年校级理工自然科学项目(2015XJZ23)
关键词
植被覆盖度
时空变化
地形因子
GIS
Vegetation coverage
Temporal and spatial variation
Topographic factors
GIS
