首页|Can small-scale altitudinal gradients predict spatial and temporal patterns in tropical forests?

Can small-scale altitudinal gradients predict spatial and temporal patterns in tropical forests?

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In tropical montane forests, compositional and structural changes are commonly driven by broad-scale altitudinal variation. Here, given the lack of knowledge on small-scale vegetation changes and temporal dynamics, we address the effects of small-scale variations in soil and alti-tude on tree community structure, temporal dynamics and phylogenetic diversity in a semi-deciduous tropical forest of the Atlantic Forest Domain, southeastern Brazil. In 2010 and 2015 we sampled thirty plots of 400 m 2 , set up along an altitudinal gradient between 1000 and 1500 m a.s.l.. In each plot, we collected soil samples for chemical and tex-tural analyses. We fitted linear models to test the effects of altitude and soil on community dynamics and phylogenetic parameters. Altitude and soil explained the spatial variation in number of individuals and phylogenetic diversity met-rics. From lower to higher altitudes, we found decreasing fertility, increasing tree density and decreasing phylogenetic diversity. Altitude significantly influenced the increases in total biomass (from 240.9 to 255.4 t ha −1 ) and individual biomass (from 0.15 to 0.17 t) recorded in the interval. And while community temporal dynamics had rates of 1.96％ for mortality, 1.02％ for recruitment, 1.61％ for biomass loss and 2.81％ for biomass gain, none of them were explained by altitude or soil. Temporal species substitution averaged 0.1 in the interval. Altogether, these results suggest that the small-scale variations in altitude and soil likely determine the conditions and resources that drive community assem-bly and structure, which are expressed by spatial variations along the altitudinal gradient. At the same time, temporal patterns were not influenced by altitude-related environmen-tal variation, resulting in a similar dynamic behaviour across the gradient, suggesting that broad-scale factors may play a more important role than local ones.

Fine-scaleSemideciduous forestsMontane forestsDynamic patterns

Mariana Caroline Moreira Morelli、Cléber Rodrigo de Souza、Jean Daniel Morel、Vinícius Andrade Maia、Alisson Borges Miranda Santos、Kaline Fernandes Miranda、Rubens Manoel dos Santos

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Forest Sciences Department,Federal University of Lavras,Campus Universitário,Cx.P.3037,Lavras,MG, CEP 37200-000,Brazil

Department of Biology,Federal University of Lavras,Campus Universitário,Lavras,MG, CEP 37200-000,Brazil

first survey(2010)was carried out within projects financed by Foundation for the Support to the Researches in Minas Gerais(FCouncil for Scientific and Technological Development(CNPq)Council for Scientific and Technological Development(CNPq)second survey(2015)didn't have funding and was made with particular resources

under the codes APQ-03501-09FAPEMIG481363/2009-2CNPq

2021

林业研究(英文版)
东北林业大学,中国生态学学会

林业研究(英文版)

CSTPCDCSCDSCI
影响因子：0.365
ISSN：1007-662X
年,卷(期)：2021.32(5)
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