Effects of Forest Fires on Soil Microbial Biomass Carbon and Nitrogen in Shrub Wetlands of the Permafrost Zone in the Greater Khingan Range
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维普
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林火是影响多年冻土稳定性的主要因素之一,对火后多年冻土区土壤微生物生物量碳氮的变化特征进行分析,为火后冻土土壤恢复提供理论依据.以大兴安岭漠河2002年火烧灌丛湿地为研究对象,在未火烧和火烧区分别随机设置5个试验样地采用土钻分别采集土壤深度(h)为0＜h≤30 cm和30 cm＜h≤60 cm 土层土壤土样,分析火后0～60 cm 土层土壤理化性质和土壤微生物生物量碳/氮(MBC/MBN)的变化特征.结果表明:(1)火烧样地0＜h≤30 cm和30 cm＜h≤60 cm 土层的MBC质量分数分别降低54.69％和53.11％,MBN质量分数分别降低38.77％、33.00％.(2)火烧样地0＜h≤30 cm 土层的土壤温度和土壤密度分别增加90.82％、161.54％,土壤含水率、全碳质量分数和全氮质量分数分别降低88.51％、48.57％和32.98％;30 cm＜h≤60 cm 土层的土壤温度、土壤含水率、硝态氮(NO3--N)质量分数和pH分别增加213.26％、24.23％、38.36％和3.75％,土壤全碳、全氮和全磷质量分数分别降低44.70％、38.0％和31.03％.(3)在0＜h≤30 cm 土层,MBC、MBN与土壤含水率、土壤全碳、全氮和全磷质量分数呈显著正相关关系,与土壤密度和林火强度(FS)呈显著负相关关系,土壤全碳质量分数、土壤密度和林火强度是影响MBC和MBN的主要因子;在30 cm＜h≤60 cm 土层,MBC、MBN与全碳质量分数、全磷质量分数呈显著正相关关系,与土壤密度呈显著负相关关系;土壤密度、全碳质量分数和土壤含水率是影响MBC和MBN的主要因子.
Forest fires are one of the main factors affecting the stability of permafrost.This study analyzes the changes in soil mi-crobial biomass carbon and nitrogen in permafrost zones after fire,providing a theoretical basis for soil recovery post-fire.The research was conducted in the shrub wetlands of Mo'he,Greater Khingan Range,which experienced a forest fire in 2002.Five experimental plots were randomly established in both unburned and burned areas,where soil samples were col-lected at depths of 0＜h≤30 cm and 30 cm＜h≤60 cm using a soil auger.The study analyzed the physicochemical properties of the soil and the changes in microbial biomass carbon(MBC)and nitrogen(MBN)in the 0-60 cm soil layer after fire.The results showed that:(1)The mass fraction of MBC in the burned site decreased by 54.69％and 53.11％for the 0＜h≤30 cm and 30 cm＜h≤60 cm layers,respectively,while the mass fraction of MBN decreased by 38.77％and 33.00％,respectively.(2)In the burned site,the soil temperature and soil density of the 0＜h≤30 cm layer increased by 90.82％and 161.54％,respectively,and the soil moisture content,total carbon mass fraction,and total nitrogen mass fraction sig-nificantly decreased by 88.51％,48.57％,and 32.98％,respectively.For the 30 cm＜h≤60 cm layer,the soil tempera-ture,soil moisture content,nitrate nitrogen(NO3-N)mass fraction,and pH increased by 213.26％,24.23％,38.36％,and 3.75％,respectively,while the mass fractions of total carbon,total nitrogen,and total phosphorus decreased by 44.70％,38.0％,and 31.03％.(3)In the 0＜h≤30 cm layer,MBC and MBN showed a significant positive correlation with soil moisture content,total carbon,total nitrogen,and total phosphorus mass fractions,while exhibiting a significant negative correlation with soil density and fire severity(FS).The total carbon mass fraction,soil density,and fire severity were the primary factors influencing MBC and MBN.In the 30cm＜h≤60cm layer,MBC and MBN were significantly posi-tively correlated with total carbon and total phosphorus mass fractions and significantly negatively correlated with soil densi-ty.Soil density,total carbon mass fraction,and soil moisture content were the main factors affecting MBC and MBN.
维普
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