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Intraspecific variations in fine root N and P and factors affecting their concentrations in Masson pine plantations across subtropical China

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林业研究:英文版 2023年第5期34卷 1463-1473页

作者： Zunji Jian Jin Xu Yanyan Ni Lei Lei Lixiong Zeng Wenfa Xiao Ecology and Nature Conservation Institute Chinese Academy of ForestryKey Laboratory of Forest Ecology and Environment of National Forestry and Grassland AdministrationBeijing 100091People’s Republic of China Co-Innovation Center for Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjing 210037JiangsuPeople’s Republic of China Wuhan Botanical Garden Chinese Academy of SciencesWuhan 430074HubeiPeople’s Republic of China

Fine roots(<2 mm)play vital roles in water and nutrient uptake.However,intraspecific variations in their chemical traits and their controlling mechanisms remain poorly understood at a regional scale.This study examine... 详细信息

Fine roots(chemical traits and their controlling mechanisms remain poorly understood at a regional scale.This study examined these intraspecific variations in fine roots in Masson pine(Pinus massoniana Lamb.)plantations across subtropical China and their responses to environmental factors.Root nitrogen(N)and phosphorus(P)concentrations and their mass ratios(N:P)ranged from 3.5 to 11.7 g kg^(-1),0.2 to0.9 g kg^(-1),and 7.8 to 51.6 g kg^(-1),respectively.These three chemical traits were significantly different between sites and in longitudinal patterns across subtropical China.Mean annual temperature was positively related to root N concentration but negatively related to root P concentration.There were significant,negative relationships between clay content and root P concentration and between pH and root N concentration.Available N had no significant relationship with root N concentration,while available P was a significantly positive relationship with root P concentration.The combined effects of altitude,climate(temperature and precipitation)and soil properties(pH,clay content,available N and P)explained 26%and 36%of the root N and P concentrations variations,respectively.These environmental variables had direct and indirect effects and exhibited disproportionate levels of total effects on root N and P concentrations.Root N and P concentrations explained 35%and 65%variations in their mass ratios,respectively.The results highlight different spatial patterns of chemical traits and various environmental controls on root N and P concentrations in these ecosystems.More cause-effect relationships of root chemical traits with abiotic and biotic factors are needed to understand nutrient uptake strategies and the mechanisms controlling intraspecific variations in plant traits.

关键词： Fine root chemical traits Environmental variables Pinus massoniana Subtropical China

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Leaf trait variation captures climate differences but differs with species irrespective of functional group

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Journal of Plant Ecology 2015年第1期8卷 61-69页

作者： Guohong Wang Jinglan Liu Tingting Meng State Key Laboratory of Vegetation and Environmental Change Institute of BotanyThe Chinese Academy of SciencesNo.20 NanxincunXiangshan100093 BeijingChina College of Natural Reserves Beijing Forestry UniversityNo.35 QinghuadongluBeijing 100083China

Aims To clarify whether variation in leaf traits with climate differs with scale,i.***.across species and within a species,and to detect whether plant functional group affects species-specific response.Methods Leaf dry matter content(LDMC),specific leaf area(SLA),mass-and area-based leaf N(N_(mass),N_(area))and leaf P concentrations(P_(mass),P_(area))and leaf chlorophyll concentration(SPAD)were measured for 92 woody plant species in two botanical gardens in China.The two gardens share plant species in common but differ in climate.Leaf trait variation between the two gardens was examined via mean comparison at three scales:all species together,species grouped into plant functional groups and within a species.A meta-analysis was performed to summarize the species-specific responses.Important Findings At the scale of all species together,LDMC,SLA,P_(mass) and N_(mass) were significantly lower in the dry-cold habitat than in the wet-warm one,whereas N_(area) and SPAD showed an inverse pattern,indicating a significant environmental effect.The meta-analysis showed that the above-mentioned patterns persisted for SLA,N_(area) and SPAD but not for the other variables at the species-specific scale,indicating that intraspecific variation affects the overall pattern of LDMC,P_(mass) and N_(mass) and P_(area).In terms of species-specific response,posi-tive,negative or nonsignificant patterns were observed among the 92 species.Contrary to our prediction,species-specific responses within a functional group were not statistically more similar than those among functional groups.Our results indicated that leaf trait variation captured climatic difference yet species-specific responses were quite diverse irrespective of plant functional group,providing new insights for interpreting trait variability with climate.

关键词： chemical traits leaf dry matter specific leaf area intraspecific variation life form woody plants botanical garden

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