检索结果-南通市图书馆

Journal of Plant Ecology 2019年第4期12卷 615-623页

作者： Tao Yan Jiaojun Zhu Huanhuan Song Kai Yang CAS Key Laboratory of Forest Ecology and Management Institute of Applied EcologyShenyang 110016China Qingyuan Forest CERN Chinese Academy of SciencesShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China

Aims Larch is the dominant timber species in Northeast China.However,compared with the adjacent secondary forests,soil available ni-trogen(N)significantly declined in~40-year-old larch plantations.Thus,it is of great importance to determine how N use strategies in larch change in response to declining soil N availability.Methods We investigated the changes in N concentration and ^(15)N natural abundance(δ^(15)N)from 18 August to 25 October in the leaves,stems,branches and roots of 1-year-old Larix kaempferi seedlings under nutrient-sufficient(NSu)and nutrient-starvation(NSt)condi-tions with a pot experiment in Northeast China.Important Findings Stem and branch N concentrations exhibited upward trends,and leaf N concentration exhibited a downward trend.Root N concentration exhibited an upward trend under NSu conditions,but a downward trend under NSt conditions.These results suggested that stems and branches were served as N storage organs,but roots shifted from storage to resorption organs when switched from NSu to NSt.Leaf nutrient resorption was intensely occurred on 11 October,as indi-cated by the sharply decreased leaf N concentration and increased stem,root and branch N concentrations.Theδ^(15)N of roots,branches and leaves overlapped between NSu and NSt approximately on 11 October,which may be regulated by isotope discrimination dur-ing N resorption.Leaf N resorption efficiency under NSt(76.33%)was significantly higher than that of NSu(56.76%),indicating that nutrient stress stimulates leaf N resorption.Taken together,larch seedlings enhance leaf nutrient resorption and shift roots from nu-trient storage to nutrient resorption to adapt to NSt conditions.These changes might relieve the adverse effects of declining soil nutrient availability on seedling survival and regeneration.

关键词： nutrient stress storage organ resorption organ redistribution stable nitrogen isotope

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