文献类型：期刊文献

中文题名：树种多样性对宝天曼天然栎林土壤有机碳的影响

英文题名：Effects of tree species diversity on soil organic carbon in natural forests of Quercus aliena var.acuteserrata in Baotianman

作者：李铭杰[1,2] 牛保亮[1,2] 陈志成[1,2] 刘彦春[3] 刘世荣[1,2]

第一作者：李铭杰

机构：[1]国家林业和草原局森林生态环境重点实验室,中国林业科学研究院森林生态环境与自然保护研究所,北京100091;[2]河南宝天曼森林生态系统国家野外科学观测研究站,南阳474350;[3]河南大学生命科学学院,开封475004

年份：2025

卷号：45

期号：21

起止页码：10687-10697

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：十四五国家重点研发计划项目(2021YFD22004,2023YFE0105100-2);科技部国家野外台站运行经费资助。

语种：中文

中文关键词：土壤有机碳;树种多样性;土壤理化性质;养分有效性

外文关键词：soil organic carbon;tree species diversity;soil physical and chemical properties;nutrient availability

分类号：S714.2

摘要：高树种多样性往往伴随更高的土壤碳含量,但其背后的驱动机制尚未完全阐明。例如,树种多样性如何通过调控土壤理化性质(如养分有效性和孔隙结构)来影响土壤有机碳积累,仍缺乏系统认知。为了揭示暖温带典型落叶阔叶天然林土壤有机碳及土壤理化性质与树种多样性之间的关系。选取宝天曼不同树种多样性的锐齿槲栎(Quercus aliena var.acuteserrata)天然次生林,测定分析土壤0—10,10—20,20—40,40—60 cm不同深度的总有机碳、总氮、总磷、有效氮、有效磷、氨态氮、硝态氮、土壤pH等土壤化学性质、生态化学计量特征及土壤容重、毛管孔隙度、田间持水量、土壤总孔隙度、饱和含水量、非毛管孔隙度等土壤物理性质。采用方差分析、主成分分析和结构方程模型等探究研究区不同树种多样性下土壤有机碳含量差异及其与土壤因子之间的关系。结果表明:1)相比于低树种多样性林分,高树种多样性林分显著提升了表层土壤有机碳含量(0—10、10—20 cm土层分别增加了54.3%和40.3%),但20 cm以下的土壤无显著差异。同时,高树种多样性使0—10 cm土层容重显著降低11.2%,毛管孔隙度显著增加10.9%,而其他土壤物理性质未发生显著变化。此外,高树种多样性林分显著提升了0—60 cm各土层全氮和全磷含量,导致养分化学计量比降低,但10—20 cm和20—40 cm土层pH值显著下降。2)宝天曼锐齿槲栎林土壤有机碳含量与土壤理化性质存在密切联系。其中土壤有效氮对土壤有机碳的影响最大,其次是土壤总氮、毛管孔隙度、饱和含水量和有效磷。3)树种多样性通过降低土壤pH值,增加土壤硝态氮、有效氮和有效磷等养分的含量,间接增加土壤有机碳。高树种多样性对土壤养分有效性的提升,是暖温带天然林土壤有机碳增加的主要原因,本研究加深了树种多样性提高森林土壤有机碳机制的认知。
Higher tree species diversity is always associated with increased soil carbon storage;however,the underlying mechanisms driving this relationship remain incompletely elucidated.For instance,it is still not systematically clear how tree species diversity affects soil organic carbon(SOC)accumulation through the regulation of soil physicochemical properties,such as nutrient availability and pore structure.To explore the relationship between SOC,soil physicochemical properties and tree species diversity in typical warm?temperate deciduous broad?leaf forests,natural secondary forests of Quercus aliena var.acuteserrata with varying tree species diversity in Baotianman were selected.Soil chemical properties(including total organic carbon,total nitrogen,total phosphorus,available nitrogen,available phosphorus,ammonium nitrogen,nitrate nitrogen,and soil pH),ecological stoichiometric characteristics,and soil physical properties(including bulk density,capillary porosity,field water?holding capacity,total porosity,saturated water content,and non?capillary porosity)were measured and analyzed at soil depths of 0—10,10—20,20—40,and 40—60 cm.Analysis of variance,principal component analysis and structural equation model were used to investigate the variations in SOC content and its relationship with soil factors under varying tree species diversity in this study.The results showed that:1)Compared to low tree species diversity stands,high tree species diversity significantly increased surface SOC content(by 54.3%and 40.3%in the 0—10 cm and 10—20 cm layers,respectively),while no significant differences were observed below 20 cm depth.High tree species diversity significantly reduced bulk density by 11.2%and increased capillary porosity by 10.9%in the 0—10 cm layer,while other soil physical properties remained unchanged.Moreover,high?diversity stands enhanced total nitrogen and total phosphorus contents throughout the 0—60 cm profile,which decreased stoichiometric ratios,although soil pH values significantly declined in the 10—20 cm and 20—40 cm layers.2)In Quercus aliena var.acuteserrata forests of Baotianman,SOC content exhibited strong correlations with soil physicochemical properties.Among the measured factors,available nitrogen(AN)contributes the most to SOC,followed by nitrogen TN,capillary porosity,saturated water content,and available phosphorus(AP).3)Tree species diversity indirectly enhanced SOC by reducing soil pH and increasing the contents of key nutrients,including nitrate nitrogen(NO-3?N),AN,and AP.The improved soil nutrient availability under high tree species diversity was identified as the primary driver of SOC accumulation in warm?temperate natural forests.This study deepens the understanding of the mechanisms by which tree species diversity enhances forest SOC.