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Interactions between climate and soil shape tree community assembly and above-ground woody biomass of tropical dry forests
Forest Ecology and Management ( IF 3.7 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.foreco.2020.118348
Vinícius Andrade Maia , Cléber Rodrigo de Souza , Natália de Aguiar-Campos , Nathalle Cristine Alencar Fagundes , Alisson Borges Miranda Santos , Gabriela Gomes Pires de Paula , Paola Ferreira Santos , Wilder Bento Silva , Gisele Cristina de Oliveira Menino , Rubens Manoel dos Santos

Abstract The resilience or sensitivity of seasonally dry tropical forests (SDTF) to climate change remains an important issue because of their biodiversity and ecosystem services provision. Understand the underlying ecological processes of SDTF is crucial for the development of conservation and management strategies. We tested the hypotheses that SDTF tree species richness, above-ground woody biomass (AGWB), species and phylogenetic compositions are related to climate, soil and their interactions. We sampled 16 old-growth forest sites (313 plots) of SDTF within a 290 km latitudinal gradient. The sites are located in the transition zone between Caatinga and Cerrado biogeographic domains, and are near from Atlantic domain (~100 km). In each site we collected data on vegetation (trees with diameter at breast height ≥3 cm) and soil, and obtained climate data from WorldClim. Almost all vegetation attributes were significantly related to climate and soil. Soil texture mediated the effects of precipitation for tree species richness, AGWB and phylogenetic composition. Tree species richness decreases with annual precipitation but increases under less seasonal conditions; water availability leads to increases in AGWB and drives changes in both taxonomic and phylogenetic composition in these environments. Our findings indicate that tree species richness, above-ground woody biomass, taxonomic and phylogenetic composition of SDTFs are, in general, vulnerable to drought events even from local to regional scales and show the importance of local-scale aspects to understand SDTF diversity and ecosystem functioning; and provide useful information for conservation and management strategies.

中文翻译:

热带干旱林气候和土壤形态树木群落组装与地上木质生物量的相互作用

摘要 由于提供生物多样性和生态系统服务,季节性干燥热带森林 (SDTF) 对气候变化的恢复力或敏感性仍然是一个重要问题。了解 SDTF 的潜在生态过程对于保护和管理策略的制定至关重要。我们测试了 SDTF 树种丰富度、地上木质生物量 (AGWB)、物种和系统发育组成与气候、土壤及其相互作用相关的假设。我们在 290 公里的纬度梯度内对 SDTF 的 16 个原始森林地点(313 个地块)进行了采样。这些站点位于卡廷加和塞拉多生物地理域之间的过渡带,靠近大西洋域(约 100 公里)。在每个地点,我们收集了植被(胸高直径 ≥ 3 cm 的树木)和土壤的数据,并从 WorldClim 获得气候数据。几乎所有的植被属性都与气候和土壤显着相关。土壤质地介导了降水对树种丰富度、AGWB 和系统发育组成的影响。树种丰富度随着年降水量而减少,但在较少季节性条件下增加;可用水导致 AGWB 增加,并推动这些环境中分类学和系统发育组成的变化。我们的研究结果表明,SDTFs 的树种丰富度、地上木质生物量、分类学和系统发育组成通常容易受到干旱事件的影响,即使是从局部到区域尺度,也表明局部尺度对于了解 SDTF 多样性和生态系统的重要性运作;并为保护和管理战略提供有用的信息。
更新日期:2020-10-01
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