南瓮河火烧灌丛湿地多年冻土土壤微生物量碳氮的变化特征OA
Changes in soil microbial biomass carbon and nitrogen in the permafrost region of burned shrub wetland in the Nanweng'he National Nature Reserve,northeast China
林火作为北方森林生态系统中重要的干扰因子,不仅改变了森林结构及演替特征,还对土壤理化性质及微生物量产生影响.然而,多年冻土区林火作用下的土壤微生物生物量碳(MBC)和土壤微生物生物量氮(MBN)变化特征尚不明晰.为此,本研究以大兴安岭南瓮河国家级自然保护区 2006 年灌丛湿地火烧迹地为研究对象,采用野外调查和室内实验分析法,解析火烧和未火烧样地 0-100 cm 深度土壤理化性质、MBC 和 MBN 的变化特征.结果表明:1)在 0-100 cm 深度,火烧样地 MBC 和 MBN 含量比未火烧样地高 23.27%和 46.92%;2)在 0-100 cm 深度,火烧样地比未火烧样地的土壤温度(ST)、土壤含水率(SWC)、全碳(TC)、全氮(TN)、全磷(TP)和硝态氮(NO3--N)含量分别高 56.61%、12.45%、37.79%、26.93%、67.49%和 10.81%,容重(BD)、pH 和铵态氮(NH4+-N)含量分别低 36.21%、11.90%和 34.43%;3)火烧样地 MBC 和 MBN 与 ST、SWC、TN 和 TP 呈显著正相关关系(P<0.05),与 pH 和 BD 呈显著负相关关系(P<0.05).综上所述,林火干扰后土壤理化性质及 MBC 和 MBN 含量发生明显变化,进而影响火后生态环境的恢复.本研究结果可为林火干扰后大兴安岭多年冻土区灌丛湿地土壤生态环境恢复提供基础数据和科学依据.
As a significant disturbance factor in the boreal forest ecosystem,forest fires not only change the forest structure and succession characteristics but also affect soil physicochemical properties and microbial biomass.However,the characteristics of soil microbial biomass carbon(MBC)and microbial biomass nitrogen(MBN)dynamics in permafrost regions after forest fires remain unclear.This study focuses on the burned shrub wetlands in 2006 in the Nanweng'he National Nature Reserve of Da-Xing'anling Mountains,and it analyzed the changes in soil physicochemical properties,MBC,and MBN at depths of 0-100 cm after the fire using field investigation and laboratory analysis.The results show that:1)At depths of 0-100 cm,the contents of MBC and MBN at burned sites were 23.27%and 46.92%,respectively,exceeding those at the unburned site;2)At depths of 0-100 cm,soil temperature(ST),soil moisture content(SWC),total carbon(TC),total nitrogen(TN),total phosphorus(TP),and nitrate nitrogen(NO3--N)at burned site were higher by 56.61%,12.45%,37.79%,26.93%,67.49%,and 10.81%,respectively compared with those at the unburned site;bulk density(BD),pH,and ammonium nitrogen(NH4+-N)were lower by 36.21%,11.90%,and 34.43%,respectively;3)At the burned site,MBC and MBN showed significant positive correlations with ST,SWC,TN,and TP(P<0.05)but exhibited significant negative correlations with pH and BD(P<0.05).In summary,forest fire disturbance significantly changes soil physicochemical properties and MBC and MBN contents,thereby impacting ecological recovery.The findings of this study provide fundamental data and scientific framework for restoration of soil ecological environment in shrub wetland in permafrost region of the Da-Xing'anling Mountains following forest fire disturbance.
陈魁;许涛;李晓英;李景涛;李梓钰
东北林业大学林学院,黑龙江 哈尔滨 150040东北林业大学林学院,黑龙江 哈尔滨 150040中国科学院西北生态环境资源研究院冰冻圈科学与冻土工程全国重点实验室,甘肃 兰州 730000东北林业大学林学院,黑龙江 哈尔滨 150040中国科学院西北生态环境资源研究院冰冻圈科学与冻土工程全国重点实验室,甘肃 兰州 730000
林火土壤微生物量碳氮土壤理化性质灌丛湿地大兴安岭多年冻土退化植被变化
forest firesoil microbial biomass carbon and nitrogensoil physicochemical propertiesshrub wetlandDa-Xing'anling Mountainspermafrost degradationvegetation change
《草业科学》 2026 (8)
1940-1952,13
国家自然科学基金项目(42471166、32241032)国家重点研发计划青年科学家项目(2024YFF0810900)冰冻圈科学与冻土工程重点实验室自主部署项目(CSFSE-ZQ-2407)
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