Effects of fire and nitrogen addition on photosynthesis and growth of three dominant understory plant species in a temperate forest

查看全文 作　　者：Mengjun [1]Hu;Shiqiang [1,2]Wan

机构地区：[1]International Joint Research Laboratory for Global Change Ecology,School of Life Sciences,Henan University,Kaifeng,Henan 475004,China;[2]College of Life Sciences,Hebei University,Baoding,Hebei 071002,China

出　　处：《Journal of Plant Ecology》索引2019年第12卷第4期,共10页

基　　金：This work was financially supported by the National Natural Science Foundation of China(31430015). 摘　　要：Aims Fire and atmospheric nitrogen(N)deposition have the potential to influence growth and productivity of forest canopy.However,their impacts on photosynthesis and growth traits of understory plants in forests remain largely unexplored.This study was conducted to examine the effects of burning and N addition on foliar N content,net photosynthesis and growth traits of three dominant shrub species(Vitex negundo,Lindera glauca and Symplocos chinensis)in a temperate forest in Central China.Methods The experiment used a pair-nested design,with four treatments(control,burning,N addition and burning plus N addition)and five replicates.Leaf mass area(LMA),area-based concentrations of foliar N and chlorophyll(N_(area) and Chl_(area)),net photosynthesis(A_(n)),stomatal conductance(g_(s)),maximum photosynthetic rate(A_(max))and maximal carboxylation rate(V_(cmax)),basal diameter,height and branch length(BL)of the three species were measured.Important Findings Across the three species,burning stimulated LMA,N_(area),Chl_(area),A_(n),g_(s),A_(max) and V_(cmax),and consequently enhanced basal diam-eter,height and BL.Nitrogen addition increased A_(n) and gs but did not affect LMA,N_(area),Chl_(area),A_(max),V_(cmax),basal diameter,height or BL.However,N addition strengthened the positive effects of burning on g_(s),V_(cmax),A_(n) and BL.The findings indicate the primary role of light resources in determining plant photosynthesis and growth of understory shrub species after fire and highlight that understory plants should be considered in projection of biomass accumulation and productivity of forests under environmental perturbations. 关键词：burning climate transitional zone disturbance gas exchange NUTRIENT SHRUB

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Effects of fire and nitrogen addition on photosynthesis and growth of three dominant understory plant species in a temperate forest

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