文献类型：期刊文献

中文题名：川西亚高山森林演替对土壤碳氮磷及化学计量特征的影响

英文题名：Effects of subalpine forest succession on soil carbon,nitrogen,phosphorus and stoichiometry in western Sichuan Province,China

作者：刘顺[1,2] 陈淼[1,2] 邢红爽[1,2] 陈健[1,2] 许格希[1,2] 巩闪闪[1,2] 贾磊[1,2] 孙镇[1,2] 史作民[1,2,3]

第一作者：刘顺

机构：[1]中国林业科学研究院森林生态环境与自然保护研究所,国家林业和草原局森林生态环境重点实验室,北京100091;[2]四川米亚罗森林生态系统定位观测研究站,阿坝623100;[3]南京林业大学南方现代林业协同创新中心,南京210037

年份：2025

卷号：45

期号：13

起止页码：6256-6268

中文期刊名：生态学报

外文期刊名：Acta Ecologica Sinica

收录：;北大核心:【北大核心2023】；

基金：国家重点研发计划(2021YFD2200405);中国林业科学研究院基本科研业务费专项(CAFYBB2022SY021)。

语种：中文

中文关键词：化学计量;碳氮磷;土层;森林演替;亚高山

外文关键词：stoichiometry;C,N and P;soil depth;forest succession;subalpine

分类号：S714.2

摘要：为了探讨川西亚高山森林演替对土壤碳(C)、氮(N)、磷(P)含量和化学计量特征的影响,揭示森林演替过程中土壤养分积累和循环机制,进而为区域森林生态系统服务功能评价和提升提供理论基础。采用空间代替时间的方法,选择川西亚高山演替前期阔叶林(阶段Ⅰ)、中期针阔混交林(阶段Ⅱ和Ⅲ)和演替后期暗针叶林(阶段Ⅳ)等不同演替阶段的森林为对象,研究不同土层土壤C、N、P含量及其化学计量特征在森林演替过程中的变异模式,解析森林演替对土壤C、N、P密度的影响规律及关键影响因素。研究表明,演替阶段和土层对土壤有机碳(SOC)、全氮(TN)和全磷(TP)含量、C∶P和N∶P有显著影响,但对C∶N影响不显著。土壤SOC、TN和TP含量、C∶P和N∶P随着演替的进行总体呈先升高后下降的趋势,而随着土层深度的增加呈下降的趋势。不同演替阶段0—60 cm土层SOC、TN和TP密度分别介于7.27—15.86 t/hm^(2)、0.41—0.99 t/hm^(2)和0.21—0.41 t/hm^(2),以阶段II较高。Mantel检验结果显示不同演替阶段SOC密度受N∶P、C∶P、Rao二次熵指数、功能离散指数FDis、水解性氮和有效磷的显著影响;除了以上因子外,TN密度还受植物丰富度的显著影响;TP密度只与C∶N和有效磷显著相关。研究揭示了森林恢复演替对土壤C、N、P含量和密度及其化学计量特征的影响,强调了土壤养分相对限制状况和植物功能多样性在调控森林演替对土壤C、N积累的重要作用,可以为川西亚高山土壤功能的提升和指导退化生态系统恢复提供科学依据。
Soil carbon(C),nitrogen(N),and phosphorus(P)conditions reflect soil fertility,and their stoichiometric characteristics play a vital role in indicating soil nutrient balance,and achieving sustainable forest management.Soil C,N and P stoichiometry are significantly altered by forest succession,however,the results are not consistent.The knowledge on the dynamics of soil C,N,P and their stoichiometry along subalpine forest succession in western Sichuan is still lacking.To explore the effects of subalpine forest succession on C,N,and P and their stoichiometry,and to reveal the mechanisms of nutrient accumulation and cycling in soils during forest succession,thereby providing a theoretical basis for evaluating and enhancing subalpine forest ecosystem service functions,four forests along a successional sequence—pre-successional broadleaf forests(Stage Ⅰ),mid-successional mixed coniferous and broadleaf forests(Stages Ⅱ and Ⅲ),and late-successional dark coniferous forests(Stage Ⅳ)—were selected as study objects using the“space for time substitution”approach in subalpine region of western Sichuan.The changes in soil C,N,and P contents and their stoichiometry ratios in different soil layers along the succession sequence were studied,and the successional patterns of soil C,N,and P density and the key influencing factors were analyzed.The results showed that the succession stage and soil layer had a significant effect on the contents of soil organic carbon(SOC),total nitrogen(TN),and total phosphorus(TP),as well as the C∶P,and the N∶P,but had no significant effect on the C∶N.The SOC,TN and TP contents,C∶P,and N∶P showed an overall trend of first increasing and then decreasing along the succession sequence,while decreasing with soil depth.The SOC,TN,and TP densities within the 0—60 cm soil layer across the different successional stages ranged from 7.27 to 15.86 t/hm^(2),0.41 to 0.99 t/hm^(2),and 0.21 to 0.41 t/hm^(2),respectively,with the higest values occurring at stage II.The Mantel test results showed that the SOC density across different successional stages was significantly affected by N∶P,C∶P,Rao′s quadratic entropy index,functional dispersion index(FDis),and available phosphorus.In addition to the above factors,TN density was also significantly affected by available nitrogen and plant richness,whereas TP density was only significantly correlated with C∶N and available phosphorus.The results revealed the effects of forest succession on soil C,N,and P contents,density,and stoichiometry,emphasizing the important role of relative soil nutrient limitation and plant functional diversity in regulating the accumulation of C,N,and P along the succession sequence.This can provide scientific basis for the improvement of soil function in subalpine areas of western Sichuan.