Journal
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
Volume 127, Issue -, Pages 37-44Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envexpbot.2016.03.008
Keywords
Ecosystem nutrient cycling; Foliar nutrient concentration; Internal nutrient cycling; Nutrient addition; Nutrient resorption efficiency; Nutrient resorption proficiency; Alpine grassland; N:P resorption efficiency ratio
Categories
Funding
- Western Young Scholar Program-B of the Chinese Academy of Sciences [2015-XBQN-B-21]
- China 1000 Talent Program [Y472171]
- National Natural Science Foundation of China [31570002, 41301103]
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Nutrient additions may affect plant nutrient resorption and hence alter plant community composition and nutrient cycling in ecosystems. However, there is still much debate about how changes in nutrient availability affects nutrient resorption. Field experiments were conducted in 2013 on the Kunlun Mountain alpine grassland in northwestern China to investigate the variation between two dominant grasses Stipa capillata and Seriphidium rhodanthum in term of their nutrient resorption response to contrasting N and P addition levels. Results showed increasing N addition reduced N resorption efficiency and proficiency, and the N:P resorption ratio for both grass species, but increased P resorption efficiency and proficiency for only S. rhodanthum. Phosphorus addition increased P and N resorption efficiency of S. rhodanthum. In contrast, P addition decreased P resorption efficiency but had no impact on N resorption efficiency of S. capillata. Our results suggest that nutrient resorption responses to nutrient availability differed between perennial grass species. For both species, P additions reduced P resorption proficiency but increased N resorption proficiency. Thus, nutrient resorption is sensitive to soil nutrient availability and is an important strategy for nutrient conservation strategy for alpine grasses. (C) 2016 Elsevier B.V. All rights reserved.
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