摘要
为估算新疆卡山保护区1990-2014年植被覆盖度的空间格局和变化规律,以Landsat5TM和Landast8OLI遥感影像为数据源,运用基于NDVI的改进后像元二分模型,计算植被覆盖度,从不同空间和时间尺度上分析了保护区植被的年际变化与气候和人文变化的响应。结果表明:1)受气候和人文因素的影响,1990-2014年保护区植被覆盖度下降明显,表现为低盖度区和中低盖度区面积增加,高盖度区和中高盖度区面积减少;人文因素对植被覆盖度的影响在2009-2014年较气候因素更为显著;在空间分布上,2009-2014年对比1990-2009年保护区植被覆盖度的变化较显著。2)卡山保护区的植被覆盖度自1990-2009年虽有所下降,但总体处于较稳定状态,而2009-2014年间植被盖度处于不断下降趋势;在1990-2009年昌吉地区植被覆盖度的下降幅度与阿勒泰地区相近且较低,而2009-2014年间昌吉地区植被盖度下降幅度明显高于阿勒泰地区。
In order to estimate the spatial pattern and variations of vegetation coverage in Kalamaili Ungulate Nature Reserve during 1990-2014,with Landsat5 TM and Landast8 OLI images as a data source,this paper analysed the relationship between the vegetation interannual variations in the reserve and the climate and the human factors from different spatial and temporal scales by using the improved dimidiate pixel model based on NDVIto calculate vegetation coverage.The results were as followings.Influenced by climate and human activities,the vegetation coverage in the eserve decreased significantly during 1990-2014.The area of low and mid-low vegetation coverage districts increased,while those of high and mid-high vegetation coverage districts decreased.The influence of human factors on vegetation coverage was more significant than the that of climate during 2009-2014.The changes of vegetation coverage,spatial distribution during 2009-2014 were more significant than those during 1990-2009 in the reserve.The research showed that the vegetation coverage in the reserve decreased from 1990 to 2009,but the overall situation was still in a stable state.While the vegetation coverage was on a declining trend from 2009 to 2014.The decline of vegetation coverage in Changji was similar and lower than that in Altay region during 1990-2009,but it was significantly higher than that in Altay region during 2009-2014.
出处
《西北林学院学报》
CSCD
北大核心
2016年第4期227-232,共6页
Journal of Northwest Forestry University
基金
"十二五"农村领域国家科技计划(2012BAD22B0502)
国家林业局珍稀濒危物种野外救护与繁育项目"普氏野马放野后自然灾害对其生存繁衍的影响及生境优化对策研究"
关键词
卡山保护区
植被覆盖度
降水量
温度
像元二分模型
Kalamaili Ungulate Nature Reserve
vegetation coverage
precipitation
temperature
the dimidiate pixel model
