摘要
【目的】探究岷江上游干旱河谷−山地森林交错带土壤碳氮循环的空间异质性及其影响机制,为该地区科学管理提供理论依据。【方法】于岷江上游干旱河谷与山地森林的过渡区选取具有典型代表性的橿子栎(Quercus baronii)灌木林为研究对象,基于拉丁超立方体抽样设计对样地土壤进行取样,采用经典统计学和地统计学相结合的方法分析了样地土壤碳氮含量和碳氮同位素的描述性统计特征、空间异质性、空间相似性及其相关关系。【结果】岷江上游干旱河谷−山地森林交错带橿子栎灌木林土壤δ^(13)C和土壤δ^(15)N分别呈现弱变异和中等程度的空间变异。土壤δ^(13)C和土壤δ^(15)N均呈现正的空间自相关关系,并且土壤δ^(13)C的空间聚集性高于土壤δ^(15)N。土壤δ^(13)C的空间异质性由结构性因素主导,土壤δ^(15)N的空间异质性受结构性因素和随机性因素共同影响。土壤δ^(13)C与土壤δ^(15)N的空间分布具有很强的相似性,并且都与土壤碳氮含量具有较强的空间关联。土壤δ^(13)C与土壤δ^(15)N具有很强的相关关系,并都受到土壤水分、碳氮含量及其比值的直接或间接影响。【结论】岷江上游干旱河谷−山地森林交错带橿子栎灌木林具有不同的土壤碳氮同位素空间变异程度和耦合的碳氮同位素关系。
【Objective】This study was aimed to explore the spatial heterogeneity of soil carbon(C)and nitrogen(N)cycling and its impact mechanisms of arid valley-mountain forest ecotone in the upper reaches of Minjiang River,and to provide a theoretical basis for scientific management in this region.【Method】A typical shrub forest of Quercus baronii was selected in the transition area between the arid valley and the mountain forest in the upper reaches of Minjiang River.Soil samples were sampled through a Latin hypercube sampling design,descriptive statistical characteristics,spatial heterogeneity,spatial similarity and correlation of soil C and N contents and their isotopes(δ^(13)C and δ^(15)N)were analyzed using a combination of classical statistics and geostatistical methods.【Result】The soil δ13C and soil δ^(15)N of Quercus baronii shrub forest in the arid valley-mountain forest ecotone in the upper reaches of Minjiang River showed a weak and moderate spatial variability,respectively.Both soil δ^(13)C and soil δ^(15)N showed positive spatial autocorrelation,and the spatial aggregation of soil δ^(13)C was higher than that of soil δ^(15)N.The spatial heterogeneity of soil δ^(13)C was dominated by structural factors,and the spatial heterogeneity of soil δ^(15)N was jointly influenced by structural and stochastic factors.The spatial distributions of soil δ^(13)C and soil δ^(15)N were strongly similar,and were both strongly spatially correlated with soil C and N contents.Soi lδ^(13)C and soil δ^(15)N were strongly correlated and were both directly or indirectly affected by soil moisture,C and N contents and C/N ratio.【Conclusion】The soil δ^(13)C andδ15N showed different spatial variability but coupled relationship in the Q.baronii shrub forest in the arid valley-mountain forest ecotone in the upper reaches of Minjiang River.
作者
陈健
陈淼
邢红爽
李非凡
刘顺
许格希
史作民
Chen Jian;Chen Miao;Xing Hongshuang;Li Feifan;Liu Shun;Xu Gexi;Shi Zuomin(Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration,Ecology and Nature Conservation Institute,Chinese Academy of Forestry,Beijing 100091,China;Sichuan Miyaluo Forest Ecosystem National Observation and Research Station,Lixian County 623100,China;Co-Innovation Center for Sustainable Forestry in Southern China,Nanjing Forestry University,Nanjing 210037,China)
出处
《陆地生态系统与保护学报》
2024年第1期23-34,共12页
Terrestrial Ecosystem and Conservation
基金
“十四五”国家重点研发计划课题(2023YFD2200404-03)
中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2021ZA002-2,CAFYBB2022QC002,CAFYBB2022SY021)。
关键词
干旱河谷
橿子栎
交错带
空间异质性
同位素
dry valley
Quercus baronii
ecotone
spatial heterogeneity
isotopes
