stand structural diversity rather than species diversity enhances aboveground carbon storage in secondary subtropical forests in eastern china
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2016
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Abstract
Stand structural diversity, typically characterized by variances in tree
diameter at breast height (DBH) and total height, plays a critical role in
influencing aboveground carbon (C) storage. However, few studies have
considered the multivariate relationships of aboveground C storage with
stand age, stand structural diversity, and species diversity in natural
forests. In this study, aboveground C storage, stand age, tree species, DBH
and height diversity indices, were determined across 80 subtropical forest
plots in Eastern China. We employed structural equation modelling (SEM) to
test for the direct and indirect effects of stand structural diversity,
species diversity, and stand age on aboveground C storage. The three final
SEMs with different directions for the path between species diversity and
stand structural diversity had a similar goodness of fit to the data. They
accounted for 82 % of the variation in aboveground C storage, 55–59 % of
the variation in stand structural diversity, and 0.1 to 9 % of the
variation in species diversity. Stand age demonstrated strong positive total
effects, including a positive direct effect (β = 0.41), and a
positive indirect effect via stand structural diversity (β = 0.41)
on aboveground C storage. Stand structural diversity had a positive direct
effect on aboveground C storage (β = 0.56), whereas there was
little total effect of species diversity as it had a negative direct
association with, but had a positive indirect effect, via stand structural
diversity, on aboveground C storage. The negligible total effect of species
diversity on aboveground C storage in the forests under study may have been
attributable to competitive exclusion with high aboveground biomass, or a
historical logging preference for productive species. Our analyses suggested
that stand structural diversity was a major determinant for variations in
aboveground C storage in the secondary subtropical forests in Eastern China.
Hence, maintaining tree DBH and height diversity through silvicultural
operations might constitute an effective approach for enhancing aboveground
C storage in these forests.
| Reference Key |
ali2016biogeosciencesstand
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|---|---|
| Authors | ;A. Ali;E.-R. Yan;H. Y. H. Chen;S. X. Chang;Y.-T. Zhao;X.-D. Yang;M.-S. Xu |
| Journal | tetrahedron letters |
| Year | 2016 |
| DOI |
10.5194/bg-13-4627-2016
|
| URL | |
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