2000-2018年天山植被生态质量综合评价

A comprehensive evaluation of the vegetation ecology quality from 2000 to 2018 in the Tianshan Mountains

以MODIS数据反演得到的2000-2018年天山地区净初级生产力、地面湿度、水分利用效率、叶面积指数、植被覆盖度和陆地表面温度6项指标为基础,构建植被生态质量指数,利用SEN+Mann-Kendall、Hurst指数及标准差等方法对2000-2018年天山地区植被生态质量的时空变化特征、可持续性及稳定性等进行分析,探索天山地区植被生态质量与气温降水等气候因子的关系及驱动分区.结果表明,2000-2018年,天山植被生态质量优良区面积占38.2%,等级较差和差的区域面积占41.1%,大部分区域的植被生态质量呈缓慢降低趋势;Hurst指数分析表明,天山大部分区域的植被生态质量将继续保持目前的变化趋势,天山植被生态质量稳定性整体呈"高稳定较少,中低稳定较多"的趋势特征;低覆盖草地的植被生态质量最差,其他林地的植被生态质量最优;天山植被生态质量与气温的相关性显著强于降水,天山地区约20.93%的植被生态质量变化受气候因素的驱动,约25.59%的植被生态质量变化受非气候因素的驱动,说明天山植被生态质量的时空变化是气候变化和人类活动影响下的共同结果.

The MODIS remote sensing data were used to obtain the net primary productivity,wetness,water use efficiency,leaf area index,fractional vegetation cover and land surface temperatures from 2000 to 2018 in the Tianshan Mountains.The spatio-temporal variation,sustainability and other aspects of the ecological quality of vegetation in the Tianshan Mountains from 2000 and 2018 were analyzed based on the SEN+Mann-Kendall,Hurst index and standard deviation after the vegetation ecology index was built.The relationship and driving zones between the ecological quality of vegetation and climate factors such as temperature and precipitation in the Tianshan Mountains were explored.The results showed that the area with a vegetation of good ecological quality accounted for 38.2%of the whole area,and the area with a poor grade accounted for 41.1%.The ecological quality of vegetation in most areas was slowly lowering.A Hurst index analysis showed that the ecological quality of vegetation in most areas of the Tianshan Mountains would continue with the current trend of changes.The overall stability of the ecological quality of the vegetation in the Tianshan Mountains had a trend characteristic of"high stability being less,medium and low stability being more".The ecological quality of vegetation in low-cover grasslands was the worst,and that in other woodlands was the best.About 20.93%of the ecological quality of vegetation changes in the Tianshan Mountains was driven by climate factors,and about 25.59%driven by not-climate factors.We concluded that the spatiotemporal changes in the ecological quality of vegetation from 2000 to 2018 in the Tianshan Mountains resulted from a combined impact of climate changes and increasing human activities.