期刊
GLOBAL ECOLOGY AND BIOGEOGRAPHY
卷 20, 期 2, 页码 354-361出版社
WILEY
DOI: 10.1111/j.1466-8238.2010.00602.x
关键词
Carbon : nitrogen ratio; isometric scaling; litter; plant; secondary forests; soil; time
资金
- US National Science Foundation (NSF) [DEB 0743778, DEB 0840964, DBI 0850290, ESP 0919466]
- Office of Science (BER), Department of Energy [DE-FG02-006ER64319]
- Midwestern Regional Center of the National Institute for Climatic Change Research at Michigan Technological University [DE-FC02-06ER64158]
- Div Of Biological Infrastructure
- Direct For Biological Sciences [0850290] Funding Source: National Science Foundation
- EPSCoR
- Office Of The Director [0919466] Funding Source: National Science Foundation
Aim Carbon (C) and nitrogen (N) stoichiometry is a critical indicator of biogeochemical coupling in terrestrial ecosystems. However, our current understanding of C : N stoichiometry is mainly derived from observations across space, and little is known about its dynamics through time. Location Global secondary forests. Methods We examined temporal variations in C : N ratios and scaling relationships between N and C for various ecosystem components (i.e. plant tissue, litter, forest floor and mineral soil) using data extracted from 39 chronosequences in forest ecosystems around the world. Results The C : N ratio in plant tissue, litter, forest floor and mineral soil exhibited large variation across various sequences, with an average of 145.8 +/- 9.4 (mean +/- SE), 49.9 +/- 3.0, 38.2 +/- 3.1 and 18.5 +/- 0.9, respectively. In most sequences, the plant tissue C : N ratio increased significantly with stand age, while the C : N ratio in litter, forest floor and mineral soil remained relatively constant over the age sequence. N and C scaled isometrically (i.e. the slope of the relationship between log-transformed N and C is not significantly different from 1.0) in litter, forest floor and mineral soil both within and across sequences, but not in plant tissue either within or across sequences. The C : N ratio was larger in coniferous forests than in broadleaf forests and in temperate forests than in tropical forests. In contrast, the N-C scaling slope did not reveal significant differences either between coniferous and broadleaf forests or between temperate and tropical forests. Main conclusions These results suggest that C and N become decoupled in plants but remain coupled in other ecosystem components during stand development.
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