首页|Response of plant,litter,and soil C:N:P stoichiometry to growth stages in Quercus secondary forests on the Loess Plateau,China
Response of plant,litter,and soil C:N:P stoichiometry to growth stages in Quercus secondary forests on the Loess Plateau,China
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NETL
NSTL
万方数据
维普
Ecological stoichiometry is an important indi-cator of biogeochemical cycles and nutrient limitations in terrestrial ecosystems.However,little is known about the response of ecological stoichiometry to plant growth.In this study,carbon(C),nitrogen(N),and phosphorus(P)concen-trations were evaluated in plant tissues(trees,shrubs,and herbs),litter,and soil of young(≤40-year-old),middle-aged(41-60-year-old),near-mature(61-80-year-old),and mature(81-120-year-old)Quercus secondary forests on the Loess Plateau,China.Vegetation composition,plant biomass,and C stock were determined to illustrate their interaction with stoichiometry.Only tree biomass C significantly increased with stand development.Leaf N and trunk P concentrations generally increased,but branch P decreased with growth stage.Fine roots had the highest C and P concentrations at the middle-aged stage.In contrast,shrubs,herbs,litter,and soil C:N:P stoichiometry did not change significantly during stand development.Leaf N and P were positively correlated with soil C,N,P,and their ratios.However,there was no significant correlation between litter and leaves in terms of C:N:P stoichiometry.A redundancy analysis showed that soil N best explained leaf N and P variance,and tree bio-mass and C stock were related to biotic factors such as tree age and shrub biomass.Hierarchical partitioning analysis indicated that,compared with soil or litter variables,stand age only accounted for a relatively small proportion of leaf C,N,and P variation.Thus,secondary Quercus ecosystems might have inherent ability to maintain sensitive responses of metabolically active organs to environmental factors dur-ing stand aging.The results of this work help to elucidate the biogeochemical cycling of secondary forest ecosystems in tree development,provide novel insights into the adaptation strategies of plants in different organs and growth stages,and could be used to guide fertilization programs and optimize forest structure.
Ecological stoichiometryTree biomass C stockUnderstory plantAgeStand development
Juanjuan Zhang、Xinyang Li、Meng Chen、Linjia Huang、Ming Li、Xu Zhang、Yang Cao
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College of Forestry,Northwest A&F University,Yangling 712100,People's Republic of China
State Key Laboratory of Soil Erosion and Dryland Farming On Loess Plateau,Northwest A&F University,Yangling 712100,Shaanxi,People's Republic of China
Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling 712100,Shaanxi,People's Republic of China
National Nature Science Foundation of ChinaNational Nature Science Foundation of ChinaNational Key R&D Program of ChinaNational Key R&D Program of ChinaCAS"Light of West China"Program
NETL
NSTL
万方数据
维普
