Zambrano Jenny, Marchand Philippe, Swenson Nathan G
National Socio-Environmental Synthesis Center (SESYNC), Annapolis, MD 21401, USA
National Socio-Environmental Synthesis Center (SESYNC), Annapolis, MD 21401, USA.
Proc Biol Sci. 2017 May 31;284(1855). doi: 10.1098/rspb.2017.0523.
Tree neighbourhood modelling has significantly contributed to our understanding of the mechanisms structuring communities. Investigations into the impact of neighbouring crowding on tree performance have generally been conducted at local scales, missing important regional-scale context such as the suitability of the climate for each species. Favourable climates may enhance tree performance, but this may come at the cost of increased neighbourhood crowding and competition negatively impacting survival and growth. Through the synthesis of continental-scale forest inventory and trait datasets from the northeast USA and Puerto Rico we present an analytical approach that elucidates the important interactions between local competitive and regional climatic contexts. Our results show strong asymmetries in competitive interactions and significant niche differences that are dependent on habitat suitability. The strong interaction between local neighbourhood and regional climate highlights the need for models that consider the interaction between these two processes that have been previously ignored.
树木邻域建模极大地促进了我们对构建群落机制的理解。对邻近拥挤对树木生长表现影响的研究通常是在局部尺度上进行的，忽略了重要的区域尺度背景，例如每个物种的气候适宜性。适宜的气候可能会提高树木的生长表现，但这可能是以增加邻域拥挤和竞争为代价的，而邻域拥挤和竞争会对树木的存活和生长产生负面影响。通过综合来自美国东北部和波多黎各的大陆尺度森林清查和性状数据集，我们提出了一种分析方法，该方法阐明了局部竞争和区域气候背景之间的重要相互作用。我们的结果表明，竞争相互作用中存在强烈的不对称性，并且存在依赖于栖息地适宜性的显著生态位差异。局部邻域与区域气候之间的强烈相互作用凸显了需要考虑这两个先前被忽视的过程之间相互作用的模型。
