DOI: 10.1111/gcb.12235
论文题名: Convergent responses of nitrogen and phosphorus resorption to nitrogen inputs in a semiarid grassland
作者: Lü X.-T. ; Reed S. ; Yu Q. ; He N.-P. ; Wang Z.-W. ; Han X.-G.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 9 起始页码: 2775
结束页码: 2784
语种: 英语
英文关键词: Ecological stoichiometry
; Foliar nutrient concentration
; Intraspecific variation
; Nitrogen addition
; Nutrient resorption
; Plant-soil feedback
; Resorption ratio
; Temperate steppe
Scopus关键词: nitrogen
; phosphorus
; biodiversity
; biogeochemical cycle
; community composition
; concentration (composition)
; ecosystem function
; grass
; grassland
; intraspecific variation
; nitrogen
; nutrient cycling
; phosphorus
; resorption
; semiarid region
; soil nutrient
; steppe
; stoichiometry
; article
; chemistry
; ecological stoichiometry
; ecosystem
; foliar nutrient concentration
; intraspecific variation
; nitrogen addition
; nutrient resorption
; plant-soil feedback
; Poaceae
; resorption ratio
; temperate steppe
; ecological stoichiometry
; foliar nutrient concentration
; intraspecific variation
; nitrogen addition
; nutrient resorption
; plant-soil feedback
; resorption ratio
; temperate steppe
; Ecosystem
; Nitrogen
; Phosphorus
; Poaceae
; China
; Leymus chinensis
; Poaceae
; Stipa grandis
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 4 years 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. © 2013 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62345
Appears in Collections: 影响、适应和脆弱性
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作者单位: State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110164, China; Southwest Biological Science Center, U.S. Geological Survey, Moab, UT, 84532, United States; Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China; State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
Recommended Citation:
Lü X.-T.,Reed S.,Yu Q.,et al. Convergent responses of nitrogen and phosphorus resorption to nitrogen inputs in a semiarid grassland[J]. Global Change Biology,2013-01-01,19(9)