文献类型：期刊文献

中文题名：岷江上游干旱河谷?山地森林交错带土壤碳氮含量及同位素的空间异质性

英文题名：Spatial Heterogeneity of Soil Carbon and Nitrogen Contents and Isotopes in the Arid Valley-Mountain Forest Ecotone in the Upper Reaches of Minjiang River,China

作者：陈健[1,2] 陈淼[1,2] 邢红爽[1,2] 李非凡[1,2] 刘顺[1,2] 许格希[1,2] 史作民[1,2,3]

第一作者：陈健

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国家定位观测研究站,理县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：2024

卷号：4

期号：1

起止页码：23-34

中文期刊名：陆地生态系统与保护学报

外文期刊名：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)。

语种：中文

中文关键词：干旱河谷;橿子栎;交错带;空间异质性;同位素

外文关键词：dry valley;Quercus baronii;ecotone;spatial heterogeneity;isotopes

分类号：S714

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.