文献类型： 外文期刊

作者： Wan, Song-Ze ¹ ; Yang, Gui-sheng ² ; Mao, Rong ¹ ;

作者机构： 1.Jiangxi Agr Univ, Key Lab, State Forestry & Grassland Adm Forest Ecosyst Pro, Nanchang 330045, Jiangxi, Peoples R China

2.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Haikou 571101, Hainan, Peoples R China

3.Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Wetland Ecol & Environm, Changchun 130102, Peoples R China

关键词： Eutrophicat on; Marsh; Nitrogen deposition; Nutrient allocation strategy; Plant growth form; Vegetation dynamics

期刊名称：ECOLOGICAL INDICATORS （ 影响因子：4.958； 五年影响因子：5.846 ）

ISSN： 1470-160X

年卷期： 2020 年 110 卷

页码：

收录情况： SCI

摘要： Temperate wetlands have been experienced increased nitrogen (N) and phosphorus (P) loadings, but how plant N and P fractions respond to nutrient enrichments and its role in driving vegetation dynamics remain elusive in these ecosystems. Here, we used a 3-year N (6.0 g N m(-2) year(-1)) and P (1.2 g P m(-2) year(-1)) addition experiment to investigate the effects of nutrient enrichment on aboveground plant biomass, leaf N, P, structural N (N-S), non-structural N (N-NS), inorganic P (P-I), and organic P (P-O) concentrations of five common species belonging to two growth forms (grass and sedge) in a freshwater marsh, Northeast China. Our results showed that, although leaf N and P concentrations increased with respective nutrient additions, the responses of aboveground plant biomass and leaf nutrient allocation patterns to nutrient enrichments were idiosyncratic. Specifically, N addition simultaneously increased leaf N-NS:N-N ratio and aboveground biomass of grass species (Deyeuxia angustifolia and Glyceria spiculosa), while P addition increased leaf P-I:P-O ratio and aboveground biomass of sedge species (Carex meyeriana, C. lasiocatpa, and C. humida). This indicated that the species-specific responses of leaf nutrient fractions to N and P addition may explain the altered vegetation structure in this wetland. Our findings suggest that leaf nutrient fractions are more reliable than total nutrient concentrations to indicate the adaptative strategies of wetland plants to nutrient enrichments, and highlight that the shifts in leaf N and P allocation patterns would be a potential tool to predict the effect of nutrient enrichments on vegetation dynamics in temperate wetlands.