期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 772, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.144951
关键词
Nutrient retranslocation; Nutrient use strategy; Nutrient conservation; Resorption efficiency; Resorption proficiency; Nutrient limitation
资金
- National Natural Science Foundation of China [31872691, 41877094, 31960242, 31760153]
- Natural Science Foundation of Guangxi Province of China [2018JJB130210]
- Guangxi Bagui Scholarship Program
- National High-Level Talents Specical Support Program
- Department of Energy Terrestrial Ecosystem Sciences Program [89243018S-SC-000017]
- U.S. Geological Survey Ecosystems Mission Area
Our study found that plants in nutrient-limited forests exhibit higher nitrogen resorption efficiency, while those in phosphorus-limited forests show higher phosphorus resorption proficiency, indicating a preferential resorption of the more limiting nutrient in response to nutrient limitation. Stoichiometric control was demonstrated by the positive relationship between NRE: PRE and leaf N:P ratios within each forest. Additionally, nutrient concentration controls were observed, with higher resorption proficiency in the nutrient-poor forest than in the nutrient-rich forest.
Leaf resorption is critical for considerations of how plants use and recycle nutrients, but fundamental unknowns remain regarding the controls over plant nutrient resorption. Empirical studies suggest al least three basic types of resorption control, including (i) stoichiometric control, (ii) nutrient limitation control, and (iii) nutrient concentration control strategies. However, which strategies are adopted in given conditions and whether multiple strategies coexist in an ecosystem are still open questions. To address these unknowns, leaf nitrogen (N) and phosphorus (P) resorption efficiency (NRE and PRE) and proficiency were measured for seven woody species at a nutrient-rich but potentially N-limited secondary forest and a nutrient-poor and potentially P-limited secondary forest. NRE was higher in the N-limited forest while PRE was higher in the P-limited forest, suggesting that plants responded to nutrient limitation with preferential resorption of the more limiting nutrient. NRE: PRE was positively related to leaf N:P ratios within each forest, demonstrating a role for stoichiometric control. Nutrient concentration controls were also found, with higher nutrient resorption proficiency in the nutrient-poor forest than in the nutrient-rich forest. The controls of stoichiometry and nutrient concentration were community-wide, but the nutrient limitation control was species-specific. Our results highlight the coexistence of multiple nutrient resorption strategies in a single ecosystem, and suggest these strategies are scale-dependent. (C) 2021 Elsevier B.V. All rights reserved.
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