草业科学2026，Vol.43Issue(8)：1940-1952,13.DOI:10.11829/j.issn.1001-0629.2024-0732
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
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
摘要
Abstract
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.关键词
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Key words
forest fire/soil microbial biomass carbon and nitrogen/soil physicochemical properties/shrub wetland/Da-Xing'anling Mountains/permafrost degradation/vegetation change引用本文复制引用
陈魁,许涛,李晓英,李景涛,李梓钰..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[J].草业科学,2026,43(8):1940-1952,13.基金项目
国家自然科学基金项目(42471166、32241032) （42471166、32241032）
国家重点研发计划青年科学家项目(2024YFF0810900) （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) （CSFSE-ZQ-2407）
