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Impacts of competition and nitrogen addition on plant stoichiometry and non-structural carbohydrates in two larch species

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Journal of forestry Research 2021年第5期32卷 2087-2098页

作者： Xiaoyi Wu Xuhua Du Shiyan Fang Jieyu Kang Zhichao Xia Qingxue Guo College of Life and Environmental Sciences Hangzhou Normal UniversityHangzhou 310036People’s Republic of China Key Laboratory of State forestry Administration on Bamboo Resources and Utilization China National Bamboo Research CenterHangzhou 310012People’s Republic of China

Previous research has shown that competition between plants can have differential effects on leaf stoichiometry and non-structural carbohydrate(NSC)in different ***,little attention has been given to understanding these effects on non-photosynthetic organs,particularly of deciduous tree *** we assess the impact of competition on below and aboveground biomass,stoichiometry,nutrient composition and NSC in pure and mixed forests of two Larch species,Larix kaempferi and *** under nitrogen(N)*** enrichment did not result in stronger intraspecific competition for both species and *** benefited from the presence of *** under different N *** kept relatively stable C/N compared to roots and branches in response to competition,while N addition imposed stronger impacts on N/P of different organs rather than *** contrast to stable C concentrations,starch and soluble sugar concentrations were more easily impacted by competition and the addition of *** forced *** and *** to allocate more carbon into storage by increasing their starch concentration and starch/soluble sugar of stems under ***,no significant differences in stoichiometry and NSC concentration between intra-and interspecific competition were *** and nutrient pools of *** stems,branches and coarse roots consistently declined due to competition regardless of N *** and fine roots of *** accumulated more N when in competition with *** than with a conspecific neighbor under N *** results show that NSC was more sensitive to competition relative to stoichiometric traits(N and P)of non-photosynthetic organs.

关键词： Intraspecific and interspecific competition Non-photosynthetic organs Resource competition Remobilization and storage mixed forest plantations

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