林火干扰对广东马尾松林土壤有机碳密度及其活性有机碳的影响  

Effects of forest fire disturbance on soil organic carbon density and labile organic carbon of Pinus massoniana forests in Guangdong Province,China

作　　者：罗碧珍[1] 胡海清[1] 罗斯生 魏书精[2] 吴泽鹏[2] 刘菲[1] LUO Bizhen;HU Haiqing;LUO Sisheng;WEI Shujing;WU Zepeng;LIU Fei(College of Forestry,Northeast Forestry University,Harbin 150040,China;Guangdong Provincial Key Laboratory of Silviculture,Protection and Utilization,Guangdong Academy of Forestry,Guangzhou 510520,China)

机构地区：[1]东北林业大学林学院,黑龙江哈尔滨150040 [2]广东省森林培育与保护利用重点实验室,广东省林业科学研究院,广东广州510520

出　　处：《南京林业大学学报（自然科学版）》2020年第5期132-140,共9页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家自然科学基金面上项目(41371109);中央高校基本科研业务费专项资金项目(2572017PZ05);国家林业公益性行业科研专项项目(201404402);国家重点研发计划(2018YFE0207800);广西自然科学基金项目(2014GXNSFBA118108)。

摘　　要：【目的】森林在全球碳循环中发挥着重要作用。林火干扰是全球生物地球化学循环的关键驱动因子,影响植被结构变化及森林演替方向,从而对森林生态系统土壤有机碳密度及碳周转产生重要作用,进而影响森林碳循环与碳平衡。笔者定量研究林火干扰对森林生态系统土壤有机碳密度及其活性有机碳的影响,科学阐明林火干扰对森林生态系统土壤有机碳的影响机制,为火烧迹地恢复与森林碳减排增汇提供参考。【方法】以广东省佛冈马尾松林为研究对象,采用相邻样地比较法、化学分析法,在森林生态系统水平上,定量测定不同林火干扰强度对土壤有机碳密度、土壤活性有机碳含量和细根生物量的影响,对林火干扰后土壤有机碳密度的变化进行定量研究,探讨林火干扰对土壤有机碳密度以及活性有机碳的影响机制,深入分析森林生态系统土壤有机碳的循环与分配过程。【结果】林火干扰对马尾松林的土壤有机碳密度、活性有机碳含量和细根生物量均有影响,不同林火干扰强度下土壤有机碳密度与土壤活性有机碳含量变化趋势均表现为对照>轻度林火干扰>中度林火干扰>重度林火干扰。轻度林火干扰对土壤有机碳密度的影响差异不显著(P>005),而中度和重度林火干扰则显著降低土壤有机碳密度(P<005)。林火干扰的马尾松林土壤细根生物量均低于对照样地,变化趋势为重度林火干扰>中度林火干扰>轻度林火干扰,轻度林火干扰只显著降低土壤表层细根生物量(P<005),而中度和重度林火干扰显著降低了土壤表层和浅层细根生物量(P<005)。【结论】林火干扰减小了土壤有机碳密度,减少幅度随土壤剖面深度增加而逐渐变小。轻度林火干扰仅显著降低了表层土壤有机碳密度,而中度和重度林火干扰显著降低了土壤表层和浅层土壤有机碳密度,进而导致土壤有机碳密度显著�【Objective】Forests play an important role in the global carbon(C) cycle.Fire disturbance in forests is a key driving factor of the global biogeochemical cycle, as it affects vegetation structure and the direction of forest succession,which play important roles in soil organic C density and C turnover in forest ecosystems, thus affecting the forest C cycle and C balance.A quantitative study of the effects of forest fire disturbance on soil organic C density and active organic C in forest ecosystems was conducted.It also contributed to clarification of the mechanism of forest fire disturbance on soil organic C in forest ecosystems, and provided information about the recovery of burned land and forest C emission reduction effects.【Method】In a subtropicalP.massonianaforest in Guangdong Province, adjacent plot comparison and chemical analysis methods were used to quantitatively determine the soil organic C density, soil active organic C content and fine root biomass at different levels of fire disturbance(low, moderate and high) in the forest ecosystem.The impact of forest fire disturbance on soil organic C density, and the mechanism of forest fire disturbance on soil organic C density and active organic C were investigated and an in-depth analysis of the C cycle and partitioning of soil organic C in the forest ecosystem process was undertaken.【Result】The results showed that forest fire disturbance had an effect on soil organic C density, soil labile organic C content and fine root biomass inP.massonianaforest, and the trend for soil organic C density and soil labile organic C content was: control > low forest fire disturbance > moderate forest fire disturbance > high forest fire disturbance.There was no significant difference in the effect of low forest fire disturbance on soil organic C density(P> 0.05), whereas moderate and high forest fire disturbances significantly reduced soil organic C density(P< 0.05).The soil fine root biomass inP.massonianaforest was lower than that in the control plots, and the

关 键 词：林火干扰 马尾松林 土壤有机碳 活性有机碳 细根生物量 

分 类 号：S762[农业科学—森林保护学]