Correlations and stoichiometric characteristics of C,N,and P contents in Juniperus saltuaria plants,litter,and soil in the Sygera Mountains,southeastern Xizang,China  

作　　者：GUO Liangna LI Jiangrong FU Fangwei ZHANG Bo ZHU Sijie LIU Yuzhuo LI Jieting CHEN Ganggang ZHANG Yibo 

机构地区：[1]Research Institute of Tibet Plateau Ecology,Tibet Agricultual&Animal Husbandry University,Nyingchi 860000,China [2]Key Laboratory of Forest Ecology in Tibet Plateau,Ministry of Education,Nyingchi 860000,China [3]National Key Station of Field Scientific Observation&Experiment,Nyingchi 860000,China [4]Key Laboratory of Alpine Vegetation Ecological Security in Tibet,Nyingchi 860000,China

出　　处：《Journal of Mountain Science》2024年第12期4254-4268,共15页山地科学学报（英文）

基　　金：funded by the National Ministry of Science and Technology Ecological Station(LZF2020-2025);the Longterm Ecological Observation Study of Alpine Pine in Southeast Tibet(Science and Technology Innovation Base)(XZ202301JD0001G);the Graduate Student Innovation Project of Tibet Agriculture and Animal Husbandry College(YJS2023-01);the Tibet Agriculture and Animal Husbandry College Talent Team Development Fund Project(XZNMXYRCXM-2024-10).

摘　　要：Research on the multicomponent synergistic relationships between plants,litter,and soil from the perspective of ecological stoichiometry helps to understand nutrient cycling and distribution mechanisms within ecosystems.This study focused on Juniperus saltuaria,the dominant tree species in the forestline ecotone of Sygera Mountains,southeastern Xizang,China.We systematically measured and analyzed the Carbon(C),nitrogen(N),and phosphorus(P)contents and their relationships in plants(leaves,branches,trunks,fine roots),litter(undecomposed layer,partially decomposed layer,fully decomposed layer),and soil(0-10 cm,10-20 cm,20-40 cm)at different slope positions.The results showed significant differences in the C,N,and P contents and stoichiometry of plants and soil at different slope positions,while no significant differences were observed among litter layers.At the same slope position,the C,N,and P contents in leaves and surface soil were the highest,with soil nutrients significantly decreasing with increasing depth.For litter,the C content in the undecomposed layer was significantly higher than that in the partially and fully decomposed layers while the P content showed the opposite trend.Surface soil(0-20 cm)exhibited a decoupled relationship with plants but a coupled relationship with litter while deep soil(20-40 cm)showed a coupled relationship with plants.J.saltuaria showed faster growth rates on uphill slope.In this study area,J.saltuaria exhibited consistent trends of N,P,and N:P ratios homeostasis across different slope positions and organs,with leaves and fine roots both limited by N.Significant interactive effects between plants,litter,and soil nutrients were observed across different slope positions.Positive correlations were found between leaf and litter,and between fine root and leaf while the relationships between litter and soil,and between soil and fine root,varied.This study helps improve our understanding of the nutrient interactions between plants,litter,and soil in dominant species of alpine forest e

关 键 词：Leaf-litter-soil system Slope position C:N:P stoichiometry Forestline ecotone Nutritional restriction Juniperus saltuaria 

分 类 号：Q948.113[生物学—植物学]