干旱对鄱阳湖流域植被生态系统GEP的影响

Impact of drought on the GEP of Poyang Lake basin vegetation ecosystem

总生态系统生产力GEP(gross ecosystem productivity),是生态系统固定的碳总量,作为碳循环研究的重要组成部分,有着不可估量的生态价值和极为重要的人文社会意义.在全球气候变暖背景下,干旱对陆地生态系统GEP造成了一定影响.该文以鄱阳湖流域为研究区,利用生态耦合模型估算2000—2016年间每月GEP,计算干旱指数SPI(standard precipitation index)探究干旱在时间和空间分布上对GEP的影响.通过对模型模拟的GEP与MODIS的GEP产品进行对比分析,发现两者具有较好的相关性,且在GEP低值区间两者表现几乎完全一致.研究结果表明,干旱对鄱阳湖流域植被生态系统GEP存在抑制效应,随着干旱程度的加剧,GEP显著减少;两者不仅在时间上存在一致协同变化趋势,在空间分布上也表现出强烈的一致性.通过该研究,有助于管理部门了解干旱对GEP产生影响的作用机制,为流域生态环境保护提供科学支撑.

Gross ecosystem productivity(GEP)is a fixed total amount of carbon in vegetation ecosystem,which,as an important part of carbon cycle research,has inestimable ecological value and extremely important human and social significance.In the context of global warming,drought has caused a certain impact on terrestrial ecosystem GEP.In this paper,with the Poyang Lake basin as the study area and using ecological coupling model monthly GEP during 2000-2016 is estimatedd,and the influence of drought on GEP in time and spatial distribution is explored by drought index SPI(Standard Precipitation Index).The GEP simulated by the model is analyzed in comparison with the GEP products of MODIS,and the above two have a good correlation and perform almost identically in the low GEP area.The research results show that there is an inhibitory effect of drought on GEP of Poyang Lake basin ecosystem,and GEP decreases significantly with the intensification of drought.They not only have a consistent and synergistic change trend in time,but also show a strong consistency in spatial distribution.These results are able to help related departments understand the influencing mechanism drought on GEP and provide scientific support for ecological protection in the basin.