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卢永鹏,周晓果,孙冬婧,陈静文,李晓琼,陈秋海,许峻模,明安刚.生态营林对桉树人工林土壤颗粒态与矿物结合态有机碳积累的影响[J].广西科学,2026,33(3):500-510. [点击复制]
- LU Yongpeng,ZHOU Xiaoguo,SUN Dongjing,CHEN Jingwen,LI Xiaoqiong,CHEN Qiuhai,XU Junmo,MING Angang.Effects of Eco-silviculture on the Accumulation of Soil Particulate and Mineral-Associated Organic Carbon in Eucalyptus spp.Plantations[J].Guangxi Sciences,2026,33(3):500-510. [点击复制]
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| 生态营林对桉树人工林土壤颗粒态与矿物结合态有机碳积累的影响 |
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卢永鹏1, 周晓果2,3, 孙冬婧2,3, 陈静文2, 李晓琼1, 陈秋海2, 许峻模2, 明安刚3,4
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| (1.广西大学林学院, 广西南宁 530004;2.广西科学院生态环境研究所, 广西南宁 530007;3.崇左凭祥友谊关森林生态系统广西野外科学观测研究站, 广西凭祥 532600;4.中国林业科学研究院热带林业实验中心, 广西凭祥 532600) |
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| 摘要: |
| 为阐明生态营林对桉树(Eucalyptus spp.)人工林土壤颗粒态有机碳(Particulate Organic Carbon，POC)与矿物结合态有机碳(Mineral-Associated Organic Carbon，MAOC)积累的差异化调控机制，本研究以广西南亚热带传统营林尾巨桉(Eucalyptus urophylla×E.grandis)纯林(TEP)、生态营林尾巨桉纯林(EP)及其与红锥(Castanopsis hystrix)、望天树(Parashorea chinensis)、降香黄檀(Dalbergia odorifera)的混交林(分别简称MEC、MEP、MED)为研究对象，系统测定土壤碳输入、理化性质、微生物群落与功能、碳组分等指标，结合Mantel检验与结构方程模型(Structural Equation Modeling，SEM)解析关键驱动因子及其路径。结果表明：(1)与传统营林相比，生态营林显著提升土壤有机碳(Soil Organic Carbon，SOC)、POC的含量，增幅分别为26.56%—41.66%、42.38%—65.99%，且POC/SOC呈上升趋势，对MAOC含量的提升(14.72%—24.57%)未产生统计学差异；(2)POC积累与土壤含水量(Soil Water Content，SWC)、pH值、全氮(Total Nitrogen，TN)、微生物生物量、细根生物量(Fine root biomass)及全磷(Total Phosphorus，TP)含量等因子密切相关，而MAOC形成主要与土壤酶活性和养分条件密切相关；(3)结构方程模型进一步揭示，POC积累主要由细根碳输入、土壤酶活性和微生物生物量直接驱动，而MAOC形成则依赖于土壤酶活性和土壤理化性质调控的微生物转化过程。本研究表明，生态营林通过促进碳输入、改善土壤微环境，差异化地增强土壤活性碳库与稳定碳库的积累，其中混交树种配置可进一步优化碳积累路径，MED对SOC和POC含量的提升效果最显著。本研究结果可为桉树人工林碳汇功能的定向提升与可持续经营提供科学依据。 |
| 关键词: 生态营林 桉树人工林 土壤颗粒态有机碳 土壤矿物结合态有机碳 |
| DOI：10.13656/j.cnki.gxkx.20260708.005 |
| 投稿时间：2026-01-08修订日期：2026-02-09 |
| 基金项目:广西质量发展专项资金重点产业链质量提升项目(GXZLFZ2025-05)，广西科学院基本科研业务费资助项目(2024YWF2104)和广西自筹经费林业科技项目(2024GXZCJFK13)资助。 |
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| Effects of Eco-silviculture on the Accumulation of Soil Particulate and Mineral-Associated Organic Carbon in Eucalyptus spp.Plantations |
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LU Yongpeng1, ZHOU Xiaoguo2,3, SUN Dongjing2,3, CHEN Jingwen2, LI Xiaoqiong1, CHEN Qiuhai2, XU Junmo2, MING Angang3,4
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| (1.School of Forestry, Guangxi University, Nanning, Guangxi, 530004, China;2.Institute of Eco-Environment Research, Guangxi Academy of Sciences, Nanning, Guangxi, 530007, China;3.Youyiguan Forest Ecosystem Observation and Research Station of Guangxi, Pingxiang, Guangxi, 532600, China;4.Experimental Center of Tropical Forestry, Chinese Academy of Forestry, Pingxiang, Guangxi, 532600, China) |
| Abstract: |
| In order to elucidate the differential regulatory mechanisms of eco-silviculture on the accumulation of soil Particulate Organic Carbon (POC) and Mineral-Associated Organic Carbon (MAOC) in Eucalyptus spp.plantations,this study investigated a conventionally managed pure Eucalyptus urophylla×E.grandis plantation,an eco-silviculture managed pure E.urophylla×E.grandis plantation,and mixed plantations of E.urophylla×E.grandis with Dalbergia odorifera,Castanopsis hystrix,or Parashorea chinensis (referred to as MEC,MEP and MED,respectively) in the southern subtropical region of Guangxi,China.Soil carbon input,physicochemical properties,microbial community structure and function,and carbon fractions were systematically measured.Key drivers and their paths were analyzed through Mantel tests and Structural Equation Modeling (SEM).The results are summarized as follows:(1)Compared with conventional silviculture,eco-silviculture significantly increased the content of Soil Organic Carbon (SOC) and POC by 26.56%-41.66% and 42.38%-65.99%,respectively,and the POC/SOC exhibited an increasing trend.However,the increase in MAOC (14.72%-24.57%) was not statistically significant.(2)POC accumulation was closely associated with Soil Water Content (SWC),pH value,Total Nitrogen (TN),microbial biomass,fine root biomass and Total Phosphorus (TP),whereas MAOC formation was mainly regulated by soil enzyme activities and nutrient availability.(3)SEM further revealed that POC accumulation was directly driven by fine-root carbon input,soil enzyme activities and microbial biomass,while MAOC formation depended on microbial transformation processes regulated by soil enzyme activities and soil physicochemical properties.This study demonstrates that eco-silviculture differentially enhances the accumulation of both labile and stable soil carbon pools by promoting carbon input and improving the soil microenvironment.The configuration of mixed-species plantations can further optimize carbon sequestration pathways,with the mixed plantations of E.urophylla×E.grandis with D.odorifera exhibiting the most pronounced enhancement in SOC and POC.These findings provide a scientific basis for the targeted enhancement of carbon sink functionality and sustainable management of Eucalyptus spp.plantations. |
| Key words: eco-silviculture Eucalyptus spp.plantation soil particulate organic carbon soil mineral-associated organic carbon |
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