当前位置: X-MOL 学术Nature › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Shifts in tree functional composition amplify the response of forest biomass to climate
Nature ( IF 64.8 ) Pub Date : 2018-03-21 , DOI: 10.1038/nature26152
Tao Zhang , Ülo Niinemets , Justin Sheffield , Jeremy W. Lichstein

Forests have a key role in global ecosystems, hosting much of the world’s terrestrial biodiversity and acting as a net sink for atmospheric carbon. These and other ecosystem services that are provided by forests may be sensitive to climate change as well as climate variability on shorter time scales (for example, annual to decadal). Previous studies have documented responses of forest ecosystems to climate change and climate variability, including drought-induced increases in tree mortality rates. However, relationships between forest biomass, tree species composition and climate variability have not been quantified across a large region using systematically sampled data. Here we use systematic forest inventories from the 1980s and 2000s across the eastern USA to show that forest biomass responds to decadal-scale changes in water deficit, and that this biomass response is amplified by concurrent changes in community-mean drought tolerance, a functionally important aspect of tree species composition. The amplification of the direct effects of water stress on biomass occurs because water stress tends to induce a shift in tree species composition towards species that are more tolerant to drought but are slower growing. These results demonstrate concurrent changes in forest species composition and biomass carbon storage across a large, systematically sampled region, and highlight the potential for climate-induced changes in forest ecosystems across the world, resulting from both direct effects of climate on forest biomass and indirect effects mediated by shifts in species composition.

中文翻译:

树木功能组成的变化放大了森林生物量对气候的响应

森林在全球生态系统中发挥着关键作用,承载着世界上大部分的陆地生物多样性,并充当大气碳的净汇。森林提供的这些和其他生态系统服务可能对气候变化以及更短时间尺度(例如,每年到十年)的气候变率敏感。先前的研究记录了森林生态系统对气候变化和气候变异的反应,包括干旱引起的树木死亡率增加。然而,森林生物量、树种组成和气候变异之间的关系尚未使用系统采样数据在大区域内进行量化。在这里,我们使用美国东部 1980 年代和 2000 年代的系统森林清单来表明森林生物量对水资源短缺的十年尺度变化做出反应,并且这种生物量响应被社区平均耐旱性的同时变化放大,这是树种组成的一个重要功能方面。水分胁迫对生物量的直接影响会放大,因为水分胁迫往往会导致树种组成向更耐旱但生长较慢的树种转变。这些结果表明,在一个大型系统采样区域,森林物种组成和生物量碳储存同时发生变化,并强调了气候对森林生物量的直接影响和间接影响导致全球森林生态系统发生气候变化的潜力由物种组成的变化介导。树种组成的一个重要功能方面。水分胁迫对生物量的直接影响会放大,因为水分胁迫往往会导致树种组成向更耐旱但生长较慢的树种转变。这些结果表明,在一个大型系统采样区域,森林物种组成和生物量碳储存同时发生变化,并强调了气候对森林生物量的直接影响和间接影响导致全球森林生态系统发生气候变化的潜力由物种组成的变化介导。树种组成的一个重要功能方面。水分胁迫对生物量的直接影响会放大,因为水分胁迫往往会导致树种组成向更耐旱但生长较慢的树种转变。这些结果表明,在一个大型系统采样区域,森林物种组成和生物量碳储存同时发生变化,并强调了气候对森林生物量的直接影响和间接影响导致全球森林生态系统发生气候变化的潜力由物种组成的变化介导。水分胁迫对生物量的直接影响会放大,因为水分胁迫往往会导致树种组成向更耐旱但生长较慢的树种转变。这些结果表明,在一个大型系统采样区域,森林物种组成和生物量碳储存同时发生变化,并强调了气候对森林生物量的直接影响和间接影响导致全球森林生态系统发生气候变化的潜力由物种组成的变化介导。水分胁迫对生物量的直接影响会放大,因为水分胁迫往往会导致树种组成向更耐旱但生长较慢的树种转变。这些结果表明,在一个大型系统采样区域,森林物种组成和生物量碳储存同时发生变化,并强调了气候对森林生物量的直接影响和间接影响导致全球森林生态系统发生气候变化的潜力由物种组成的变化介导。
更新日期:2018-03-21
down
wechat
bug