title: Responses of plant nutrient resorption to phosphorus addition in freshwater marsh of Northeast China.
abstract: Anthropogenic activities have increased phosphorus (P) inputs to most aquatic and terrestrial ecosystems. However, the relationship between plant nutrient resorption and P availability is still unclear, and much less is known about the underlying mechanisms. Here, we used a multi-level P addition experiment (0, 1.2, 4.8, and 9.6 g P m(-2) year(-1)) to assess the effect of P enrichment on nutrient resorption at plant organ, species, and community levels in a freshwater marsh of Northeast China. The response of nutrient resorption to P addition generally did not vary with addition rates. Moreover, nutrient resorption exhibited similar responses to P addition across the three hierarchical levels. Specifically, P addition decreased nitrogen (N) resorption proficiency, P resorption efficiency and proficiency, but did not impact N resorption efficiency. In addition, P resorption efficiency and proficiency were linearly related to the ratio of inorganic P to organic P and organic P fraction in mature plant organs, respectively. Our findings suggest that the allocation pattern of plant P between inorganic and organic P fractions is an underlying mechanism controlling P resorption processes, and that P enrichment could strongly influence plant-mediated biogeochemical cycles through altered nutrient resorption in the freshwater wetlands of Northeast China.
authors: Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China.
authors: Rong
authors: R
authors: Mao
authors: State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.
authors: De-Hui
authors: DH
authors: Zeng
authors: Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China.
authors: Xin-Hou
authors: XH
authors: Zhang
authors: Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China.
authors: Chang-Chun
authors: CC
authors: Song
mesh_terms: D018533:Biomass; D002681:China; D017753:Ecosystem; D005618:Fresh Water; D009584:Nitrogen / Q000378:metabolism*; D009928:Organ Specificity / Q000187:drug effects; D010758:Phosphorus / Q000494:pharmacology*; D010944:Plants / Q000187:drug effects / Q000378:metabolism*; D013045:Species Specificity; D053833:Wetlands
chemical_list: D010758:Phosphorus; D009584:Nitrogen
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