KMS Chongqing Institute of Green and Intelligent Technology, CAS
Effects of P addition on plant C:N:P stoichiometry in an N-limited temperate wetland of Northeast China | |
Mao, Rong1,2; Chen, Hui-Min1,3; Zhang, Xin-Hou1; Shi, Fu-Xi1; Song, Chang-Chun1 | |
2016-07-15 | |
摘要 | Phosphorus (P) enrichment induced by anthropogenic activities results in modified plant nutrient status, which potentially alters the stoichiometry of carbon (C), nitrogen (N), and P in plants. However, how increased P availability changes plant C:N:P stoichiometry at different hierarchical scales is unclear in N-limited ecosystems. In this study, we conducted a four-level P addition experiment (0, 1.2, 4.8, and 9.6 g P m(-2) year(-1)) to elucidate the effect of P enrichment on plant C:N:P stoichiometric ratios at both the species and community levels in a freshwater wetland in the Sanjiang Plain, Northeast China. We found that species- and community-level plant C:N:P stoichiometry responded consistently to six years of P addition, although there was a shift in species dominance. Phosphorus addition increased plant N and P concentrations and thus decreased C:N, C:P, and N:P ratios irrespective of the P addition levels. These similar change trends at different scales resulted from the identical responses of plant N and P concentrations in different species to P addition. Moreover, plant N concentration exhibited an increasing trend with increasing P addition levels, whereas plant C:N ratio showed a declining trend. At the community level, P addition at the rates of 1.2, 4.8, and 9.6 g P m(-2) year(-1) decreased the C:N ratio by 24%, 27%, and 34%; decreased the C: P ratio by 33%, 35%, and 38%; and decreased the N:P ratio by 12%, 10%, and 6%, respectively. Our results indicate that the stoichiometric responses to P addition are scale-independent, and suggest that altered plant C:N:P stoichiometry induced by P enrichment would stimulate organic matter decomposition and accelerate nutrient cycles in N-limited temperate freshwater wetlands. (C) 2016 Elsevier B.V. All rights reserved. |
关键词 | c:n:p Stoichiometric Ratios Deyeuxia Angustifolia Eutrophication Freshwater Marsh Glyceria Spiculosa Species Dominance |
DOI | 10.1016/j.scitotenv.2016.03.158 |
发表期刊 | SCIENCE OF THE TOTAL ENVIRONMENT |
ISSN | 0048-9697 |
卷号 | 559页码:1-6 |
收录类别 | SCI |
WOS记录号 | WOS:000375136600001 |
语种 | 英语 |