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Temporal shifts in the explanatory power and relative importance of litter traits in regulating litter decomposition

引用

Forest Ecosystems 2022年第6期9卷 755-763页

作者： Zhaolin Sun Peng Tian Xuechao Zhao Yanping Wang Shunzhong Wang Xiangmin Fang Qingkui Wang Shengen Liu School of Forestry and Landscape Architecture Anhui Agricultural UniversityHefei230036China Huitong Experimental Station of Forest Ecology CAS Key Laboratory of Forest Ecology and ManagementInstitute of Applied EcologyShenyang110016China University of Chinese Academy of Sciences Beijing100049China College of Forestry Taishan Forest Ecosystem Research StationShandong Agricultural UniversityTai'an271018China Institute of Botany The Chinese Academy of SciencesBeijing100093China College of Forestry Jiangxi Agricultural UniversityNanchang330032China College of Biological and Pharmaceutical Sciences China Three Gorges UniversityYichang443000China

Background:litter traits critically affect litter decomposition from local to global ***,our understanding of the temporal dynamics of litter trait-decomposition linkages,especially their dependence on plant functional type remains ***:We decomposed the leaf litter of 203 tree species that belong to two different functional types(deciduous and evergreen)for 2 years in a subtropical forest in *** Weibull residence model was used to describe the different stages of litter decomposition by calculating the time to 10%,25%and 50%mass loss(Weibull t_(1/10),t_(1/4),and t_(1/2)respectively)and litter mean residence time(Weibull MRT).The resulting model parameters were used to explore the control of litter traits(e.g.,N,P,condensed tannins and tensile strength)over leaf litter decomposition across different decomposition ***:The litter traits we measured had lower explanatory power for the early stages(Weibull t_(1/10)and t_(1/4))than for the later stages(Weibull t_(1/2)and MRT)of *** relative importance of different types of litter traits in influencing decomposition changed dramatically during decomposition,with physical traits exerting predominant control for the stages of Weibull t_(1/10)and MRT and nutrient-related traits for the stages of Weibull t_(1/4),and t_(1/2).Moreover,we found that litter decomposition of the early three stages(Weibull t_(1/10),t_(1/4),and t_(1/2))of the two functional types was controlled by different types of litter traits;that is,the litter decomposition rates of deciduous species were predominately controlled by nutrient-related traits,while the litter decomposition rates of evergreen species were mainly controlled by carbon-related ***:This study suggests that litter trait-decomposition linkages vary with decomposition stages and are strongly mediated by plant functional type,highlighting the necessity to consider their temporal dynamics and plant functional types for impr

关键词： Decomposition model Decomposition stage litter decay litter physical traits litter quality Plant functional type

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