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题名: Convergent responses of nitrogen and phosphorus resorption to nitrogen inputs in a semiarid grassland
作者: Lu X. T. ; Reed S. ; Yu Q. ; He N. P. ; Wang Z. W. ; Han X. G.
出处: Global Change Biology
发表日期: 2013
卷: 19
期: 9
页: 2775-2784
关键词: ecological stoichiometry ; foliar nutrient concentration ; intraspecific ; variation ; nitrogen addition ; nutrient resorption ; plant-soil feedback ; resorption ratio ; temperate steppe ; nutrient resorption ; terrestrial ecosystems ; inner-mongolia ; limitation ; deposition ; availability ; stoichiometry ; proficiency ; patterns ; plants
英文摘要: Human activities have significantly altered nitrogen (N) availability in most terrestrial ecosystems, with consequences for community composition and ecosystem functioning. Although studies of how changes in N availability affect biodiversity and community composition are relatively common, much less remains known about the effects of N inputs on the coupled biogeochemical cycling of N and phosphorus (P), and still fewer data exist regarding how increased N inputs affect the internal cycling of these two elements in plants. Nutrient resorption is an important driver of plant nutrient economies and of the quality of litter plants produce. Accordingly, resorption patterns have marked ecological implications for plant population and community fitness, as well as for ecosystem nutrient cycling. In a semiarid grassland in northern China, we studied the effects of a wide range of N inputs on foliar nutrient resorption of two dominant grasses, Leymus chinensis and Stipa grandis. After 4years of treatments, N and P availability in soil and N and P concentrations in green and senesced grass leaves increased with increasing rates of N addition. Foliar N and P resorption significantly decreased along the N addition gradient, implying a resorption-mediated, positive plant-soil feedback induced by N inputs. Furthermore, N:P resorption ratios were negatively correlated with the rates of N addition, indicating the sensitivity of plant N and P stoichiometry to N inputs. Taken together, the results demonstrate that N additions accelerate ecosystem uptake and turnover of both N and P in the temperate steppe and that N and P cycles are coupled in dynamic ways. The convergence of N and P resorption in response to N inputs emphasizes the importance of nutrient resorption as a pathway by which plants and ecosystems adjust in the face of increasing N availability.
收录类别: SCI
语种: 英语
ISSN号: 1354-1013
内容类型: SCI/SSCI论文
URI标识: http://ir.igsnrr.ac.cn/handle/311030/30356
Appears in Collections:历年回溯文献_SCI/SSCI论文

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Lu X. T.;Reed S.;Yu Q.;He N. P.;Wang Z. W.;Han X. G.. Convergent responses of nitrogen and phosphorus resorption to nitrogen inputs in a semiarid grassland, Global Change Biology,2013,19(9): 2775-2784
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