Responses and sensitivity of N, P and mobile carbohydrates of dominant species to increased water, N and P availability in semi- arid grasslands in northern China
作者机构：Key Laboratory of Forest Ecology and ManagementInstitute of Applied EcologyChinese Academy of SciencesNo.72 Wenhua RoadShenhe DistrictShenyang 110016China College of Resources and EnvironmentUniversity of Chinese Academy of SciencesNo.19A Yuquan RoadShijingshan DistrictBeijing 100049China Forest dynamicsSwiss Federal Research Institute WSlZuercherstrasse 111CH-8903 BirmensdorfSwitzerland
出 版 物：《Journal of Plant Ecology》 (植物生态学报（英文版）)
年 卷 期：2017年第10卷第3期
页 面：486-496页
核心收录：
基 金：The National Natural Science Foundation of China(41371076,31370009) the National Key Basic Research Program of China(2011CB403204) the State Key Laboratory of Forest and Soil Ecology(LFSE2013-01)
主 题：climate change non-structural carbohydrates perennial grasses perennial forbs steppe
摘 要：Aims We aimed to improve the understanding of the carbon and nutri-ent physiological responses and adaptation of semi-arid grassland plants to environmental *** We investigated plant leaf non-structural carbohydrate(NSC=solu-ble sugars+starch),nitrogen(N)and phosphorus(P)levels in an Inner Mongolian semi-arid grassland community treated with water,N and P additions for 8 *** dominant grasses(Agropyron cris-tatum(L.)Gaertn.,Stipa krylovii Roshev.)and two forbs(Artemisia frigida Willd.,Potentilla bifurca L.)were *** Findings Water addition decreased plant leaf N and P concentrations,whereas N and P addition increased them,indicating that the semi-arid grassland studied suffers from a shortage of N and P *** N and P addition decreased the levels of soluble sugars,starch and thus also NSC in plant leaves,which may be attributed to(i)increased carbohydrate consumption associated with a higher growth rate,and(ii)a dilution effect of greater plant size under N and P *** addition tended to increase the leaf NSC levels both in the grasses(+9.2%)and forbs(+0.6%only),which may be a result of increased photosynthesis of plants with increased water *** conditions of ambient and increased water supply in the present study,N addition resulted in an N/P ratio of16 in the grasses but a significantly lower N/P ratio of11 in the forb *** finding implies that growth of the two grass spe-cies will be limited mainly by P availability but the forbs will still be mainly limited by N supply if N deposition,alone or in combination with summer precipitation,continues to increase as predicted in Inner Mongolia.
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