基于2000—2014年的MODIS NDVI数据,应用趋势分析法对塔吉克斯坦夏季植被覆盖的时空变化特征进行了研究。结果表明1)15年间,塔吉克斯坦植被覆盖区夏季平均NDVI整体呈增加趋势,但线性趋势不明显;2)15年间,NDVI值较小(<0.2)和较大(>0.5)的等级区间面积波动较大,而处于中间(0.2~0.5)的等级区间面积的较为平稳;3)空间分布上,夏季中西部地区的平均NDVI高于东部地区;海拔较低的山区和地势平坦的谷地NDVI较高,高海拔的山区的NDVI相对较小;4)空间变化上,夏季NDVI升高区面积最大,降低区次之,稳定区面积最小;线性变化显著和极显著区面积较小,不显著区涵盖了95%以上的植被覆盖区;5)摸清植被覆盖的变化特征可以促进该国植被演化趋势的研究,并在生态环境建设政策的制定方面起到积极作用。
This paper analyzes the spatial and temporal variations of vegetation coverage in Tajikistan using the MODIS NDVI data during 2000—2014 and based on the method of trends analysis.The results showed that(1)The average NDVI in the summers of Tajikistan was on the rise in the recent 15 years,but the linear trend was not obvious.(2)The area percentage of NDVI value grade was volatile in the smaller (< 0.2)and bigger (> 0.5)ranges,the middle (0.2～0.5)range of area was relatively smooth.(3)In spatial distribution,the average NDVI in the central and western regions was higher than that in the eastern region;the NDVI of lower altitude mountains and flat valley is higher than that in the high altitude mountains.(4)In spatial variations,the increasing area was the largest,the reducing area is the second,and the stability area was the smallest;To the linear change,the significant and very significant areas were very small,and the less significant area covers more than 95% of the vegetation covered areas.(5)To find out the variation characteristics of vegetation coverage can promote the study of the country's vegetation evolution trend,and play a positive role in the development of ecological environment construction policies.
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