Nutrient resorption of coexistence species in alpine meadow of the Qinghai-Tibetan Plateau explains plant adaptation to nutrient-poor environment | |
Jiang C. M. ; Yu G. R. ; Li Y. N. ; Cao G. M. ; Yang Z. P. ; Sheng W. P. ; Yu W. T. | |
2012 | |
关键词 | Leaf nutrient concentration Nutrient resorption Allometric equations Alpine meadow Qinghai-Tibetan Plateau organic nitrogen phosphorus stoichiometry leaf nitrogen functional-significance terrestrial ecosystems mineral-nutrition grassland biomes scale patterns arctic plants wild plants |
英文摘要 | Nitrogen (N) and phosphorus (P) resorption from senescing organs are important plant nutrient conservation mechanisms. However, whether nutrient resorption can indicate plant adaptation to nutrient-poor environment remains a controversy. We quantified nutrient resorption efficiency of major species in an alpine meadow of the Qinghai-Tibetan Plateau. N and P resorption for these species averaged 65.2% and 67.4%, respectively, which was at the high end of the values of global scale. Among three life forms, sedges contained least N and P and had highest resorption efficiency, indicating sedges had a competitive advantage over grasses and forbs in this nutrient-poor environment. This result was consistent with the fact that sedge was the typically dominant plant functional group in Qinghai-Tibetan Plateau. By fitting the allometric equations ([ nutrient](senescent) = A([nutrient](live))(B)) separately for N and P, we found much smaller B (N) than B (P), which suggested that relative to the resorption from senescent leaves, the cost of N uptake from soils increased more quickly than that of P as resource availability decreased. This phenomenon was contrary to the corresponding N and P acquisition pattern of the tropical ecosystem, which matched the large geographical gradients of N vs. P limitation (N for alpine ecosystem, while P for tropical ecosystem). This study suggests that surveying leaf nutrient concentration and resorption could provide indicative information about plant adaptation to nutrient-poor soil within and across ecosystems. Our finding offers insights to nutrient management and ecosystem restoration in nutrient-poor environment and delivers information for upcoming meta-studies and model simulation of global leaf nutrient resorption. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved. |
出处 | Ecological Engineering |
卷 | 44 |
页 | 1-9 |
收录类别 | SCI |
语种 | 英语 |
ISSN号 | 0925-8574 |
内容类型 | SCI/SSCI论文 |
源URL | [http://ir.igsnrr.ac.cn/handle/311030/26892] |
专题 | 地理科学与资源研究所_历年回溯文献 |
推荐引用方式 GB/T 7714 | Jiang C. M.,Yu G. R.,Li Y. N.,et al. Nutrient resorption of coexistence species in alpine meadow of the Qinghai-Tibetan Plateau explains plant adaptation to nutrient-poor environment. 2012. |
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