The coupled model AVIM-RIEMS2.0 is employed to examine the effects of climate change on the terrestrial ecosystem over East Asia during three decades since the 1980s. The vegetation parameters present significantly different responses to climate change in subregions, since the effects of climate change trigger seasonal signals on land surface processes at the regional scale. In the 1980s, the increasing temperature and rainfall lead to a decrease in biomass and leaf area index (LAI) in winter, but a slight increase in net primary productivity (NPP) over China. However, summertime precipitation shows interval changes of cyclic increase-decrease pattern over eastern China, and the similar pattern also occurs for the variations in biomass and LAI. In the 1990s, the temperature and precipitation over the most regions in East Asia demonstrate the opposite changes compared to the 1980s, which results in converse variations in LAI and vegetation carbon flux. In the 2000s, biomass and LAI in the mid-lower reaches of Yangtze River basin and southeast coastal regions exhibit the same changes as precipitation in winter, and NPP shows a similar response to temperature. The biomass and LAI show consistent responses to regional climate change in summer, while different responses are seen for NPP. In general, climate change had a great impact on the vegetation in the 1990s, which produced the remarkable influences on LAI and biomass in winter and the significant impacts on NPP in summer. Over the regions affected significantly by East Asian monsoon, e.g. South China, the terrestrial ecosystem displays a roughly consistent response to regional climate change.

译文

自20世纪80年代以来的三十年中,使用耦合模型AVIM-RIEMS2.0来研究气候变化对东亚陆地生态系统的影响。由于气候变化的影响在区域范围内触发了季节性信号,因此植被参数对次区域气候变化的响应存在显着差异。20世纪80年代,温度和降雨的增加导致冬季生物量和叶面积指数 (LAI) 下降,但中国的净初级生产力 (NPP) 略有增加。然而,夏季降水显示出中国东部地区循环增减模式的间隔变化,生物量和LAI的变化也出现类似的模式。20世纪90年代,与20世纪80年代相比,东亚大部分地区的温度和降水表现出相反的变化,这导致LAI和植被碳通量的相反变化。21世纪00年代,长江流域中下游和东南沿海地区的生物量和LAI与冬季的降水变化相同,NPP对温度的响应相似。生物量和LAI在夏季对区域气候变化表现出一致的响应,而NPP则表现出不同的响应。总的来说,气候变化对20世纪90年代植被的影响很大,冬季对LAI和生物量的影响很大,夏季对NPP的影响也很大。在受东亚季风影响较大的地区,例如华南地区,陆地生态系统对区域气候变化表现出大致一致的响应。

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