UNASSIGNED:陆地生态系统的生产力和群落结构受总降水量和年内降水模式的调节,气候变化已经改变了。降水事件的时间和大小是年内降水模式的两个关键因素,并可能通过影响土壤水分来驱动生态系统功能。然而,年内降水模式如何影响生态系统的生产力和群落结构的可推广模式尚不清楚。
UNASSIGNED:我们综合了17项研究的633个观测值,并进行了全球荟萃分析,以调查年内降水模式对陆地生态系统生产力和群落结构的影响。通过对年内降水模式进行分类,我们还评估了降水事件的大小和时间对植物生产力的重要性。
UNASSIGNED:我们的结果表明,年内降水模式使多样性降低了6.3%,但提高了地下净初级生产力,丰富,和相对丰度16.8%,10.5%,和45.0%,分别。值得注意的是,我们发现降水事件的时间一致性对植物生产力更为重要,而植物群落结构受益于降水变异性的增加。此外,植物生产力与群落结构和土壤水分动态响应的关系较符合非线性模型。
UNASSIGNED:揭示了植物生产力和群落结构对年际降水模式变化的响应模式,强调了降水事件的时间一致性对生产系统运行的重要性,这对于增强对受降水模式改变影响的生态系统的结构和功能的理解并预测其变化至关重要。
UNASSIGNED: The productivity and community structures of terrestrial ecosystems are regulated by total precipitation amount and intra-annual precipitation patterns, which have been altered by climate change. The timing and sizes of precipitation events are the two key factors of intra-annual precipitation patterns and potentially drive ecosystem function by influencing soil moisture. However, the generalizable patterns of how intra-annual precipitation patterns affect the productivity and community structures of ecosystems remain unclear.
UNASSIGNED: We synthesized 633 observations from 17 studies and conducted a global meta-analysis to investigate the influences of intra-annual precipitation patterns on the productivity and community structures of terrestrial ecosystems. By classifying intra-annual precipitation patterns, we also assess the importance of the magnitude and timing of precipitation events on plant productivity.
UNASSIGNED: Our results showed that the intra-annual precipitation patterns decreased diversity by 6.3% but increased belowground net primary productivity, richness, and relative abundance by 16.8%, 10.5%, and 45.0%, respectively. Notably, we found that the timing uniformity of precipitation events was more important for plant productivity, while the plant community structure benefited from the increased precipitation variability. In addition, the relationship between plant productivity and community structure and soil moisture dynamic response was more consistent with the nonlinear model.
UNASSIGNED: The patterns of the responses of plant productivity and community structure to altered intra-annual precipitation patterns were revealed, and the importance of the timing uniformity of precipitation events to the functioning of production systems was highlighted, which is essential to enhancing understanding of the structures and functions of ecosystems subjected to altered precipitation patterns and predicting their changes.