文献类型：期刊文献

中文题名：南亚热带人工林树种配置对土壤有机碳含量和稳定性的影响

英文题名：Effect of tree species configuration on the content and stability of soil organic carbon in southern subtropical plantations

作者：叶晓丹[1] 王晖[2] 栾军伟[3] 王一[3] 刘世荣[2]

第一作者：叶晓丹

机构：[1]广东海洋大学滨海农业学院,湛江524088;[2]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;[3]国际竹藤中心竹藤资源与环境研究所,竹藤科学与技术国家林业和草原局重点实验室,北京100102

年份：2025

卷号：45

期号：22

起止页码：11331-11343

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：中国林业科学研究院基本科研业务费专项资助(CAFYBB2021ZW001);国家自然科学基金项目(32301559,31930078);“十四五”国家重点研发计划项目(2021YFD2200405)。

语种：中文

中文关键词：南亚热带;树种丰富度;功能类型;土壤有机碳;稳定性

外文关键词：southern subtropical;tree species richness;functional types;soil organic carbon;stability

分类号：S714.2

摘要：通过人工造林促进碳封存已成为应对气候变化的一种有效策略。然而,不同树种配置模式如何影响土壤有机碳(SOC)积累和稳定性尚不清楚。以中国南亚热带地区不同树种组成及多样性(1,2,4,6个树种梯度)组配的人工林生态系统为研究对象,系统探究了树种丰富度和功能类型对SOC含量和稳定性的影响。结果表明,土壤易氧化有机碳(EOC)含量、SOC含量和EOC/SOC比值在不同树种丰富度梯度下均未呈现显著差异,但其主要受到树种及其功能类型的显著影响。具体而言,针叶纯林SOC含量显著低于阔叶纯林,针阔混交林SOC含量显著高于针叶纯林和阔叶纯林。针叶纯林、阔叶纯林、针阔混交林和阔阔混交林间土壤EOC含量无显著差异,但林分中存在固氮树种时会显著降低土壤EOC含量。此外,马尾松纯林的EOC/SOC比值显著高于其他林分,而混交林中存在固氮树种时EOC/SOC比值显著降低。结构方程模型结果进一步表明SOC含量主要受树种混交和土壤总氮的直接影响,树种丰富度则通过促进细根生物量和细根氮输入量对SOC含量产生积极影响。EOC/SOC比值主要受固氮树种、真菌/细菌丰度比值和土壤氮有效性的直接影响,树种丰富度主要通过增加细根生物量和真菌/细菌丰度比值进而对EOC/SOC比值产生间接效应。结果表明在纯林尤其是马尾松等针叶纯林中引入固氮树种混交能显著提高SOC含量及其稳定性。研究结果为南亚热带地区科学选择造林树种优化林分配置以提高人工林长期土壤碳封存能力提供了理论依据。
Afforestation to promote carbon sequestration has become an effective strategy for mitigating climate change.However,knowledge of how different configuration modes of tree species affected soil organic carbon(SOC)accumulation and stability remains poorly understood.In this study,a manipulative planted forest involving varying tree species compositions and diversity in the southern subtropical region of China was conducted to systematically investigate the effects of tree species richness(i.e.,one,two,four,six species)and functional types on SOC content and stability.The results showed that the soil easily oxidizable organic carbon(EOC)content,SOC content,and the soil EOC/SOC ratio did not exhibit significant differences across the tree species richness gradients,but were significantly influenced by tree species and their functional types.Specifically,the SOC content in coniferous pure forests was significantly lower than that in broadleaved pure forests,whereas mixed conifer?broadleaved planted forests showed significantly higher SOC content compared to both coniferous and broadleaved pure forests.No significant differences in EOC content were observed among coniferous and broadleaved pure forests,conifer?broadleaved and broadleaved?broadleaved mixed forests.However,the presence of nitrogen?fixing tree species significantly reduced the soil EOC content.Additionally,the soil EOC/SOC ratio in Pinus massoniana planted forest was significantly higher than that in other forest types,while the presence of nitrogen?fixing tree species in mixtures significantly decreased the soil EOC/SOC ratio.The results from the structural equation model further revealed that the SOC content was primarily directly affected by tree species mixing and soil total nitrogen,while tree species richness positively influenced SOC content by promoting fine root biomass and fine root nitrogen input.The soil EOC/SOC ratio was mainly directly affected by the presence of nitrogen?fixing tree species,fungal/bacterial abundance ratio,and soil nitrogen availability,with tree species richness indirectly affecting the EOC/SOC ratio by increasing fine root biomass and the fungal/bacterial abundance ratio.These findings suggested that introducing nitrogen?fixing tree species into mixed forests,especially coniferous pure forests such as Pinus massoniana,can significantly improve SOC content and stability.This study provides a theoretical basis for optimizing tree species selection and stand configuration to enhance the long?term soil carbon sequestration capacity of plantations in the southern subtropical region.