火烧迹地不同恢复方式土壤团聚体微生物量碳特征  

Characteristics of Microbial Biomass Carbon in Soil Aggregates of Burned Area under Different Restorations

作　　者：李红运[1] 辛颖[1] 赵雨森[1] 

机构地区：[1]东北林业大学林学院,哈尔滨150040

出　　处：《水土保持学报》2016年第5期342-347,352,共7页Journal of Soil and Water Conservation

基　　金：国家"十二五"科技支撑计划项目(2011BAD08B02)

摘　　要：为探讨不同恢复方式对大兴安岭重度火烧迹地土壤团聚体形成及其团聚体碳循环的影响,以大兴安岭1987年重度火烧后分别经过人工恢复（兴安落叶松、樟子松）和天然恢复的林分为研究对象,分析不同恢复方式下土壤团聚体有机碳、团聚体微生物量碳和团聚体K2SO4浸提碳的分布特征。结果表明：（1）不同林型间土壤团聚体有机碳含量、团聚体微生物量碳含量和团聚体K2SO4浸提碳含量差异显著（P〈0.05）,其大小关系均是兴安落叶松人工林〉天然次生林〉樟子松人工林。（2）在不同植被恢复方式下,土壤有机碳含量和微生物量碳含量呈随团聚体粒径增大而增大的趋势,且大团聚体显著高于微团聚体（P〈0.05）,土壤K2SO4浸提碳主要分布于1~0.5mm粒径及其更大粒径团聚体中。（3）土壤团聚体有机碳和团聚体微生物量碳富聚于土壤表层（0—5cm）,其含量均随土层深度的增加而减小。除〉2 mm和2~1mm粒径外,其余粒径团聚体K2SO4浸提碳含量呈随土层深度增加而减小的趋势。（4）土壤微生物量碳与土壤有机碳和K2SO4浸提碳呈极显著正相关（P〈0.01）,说明土壤微生物量碳与有机碳和K2SO4浸提碳之间有密切联系。In order to explore the effects of different restoration approaches on soil aggregates＇ formation and it＇s cycle carbon of severely burned area in Greater Xing＇an Mountains,the artificial restoration（Larix gmelini and Pinus sylvestris var.mongolica）and the natural regeneration of forest in Greater Xing＇an Mountains after the severely burned in 1987 respectively were chosen as the research object and analyzed the distribution features of organic carbon,microbial biomass carbon and K2SO4-extractable carbon in soil aggregates under different restoration approaches.The results showed that：（1）There were significant difference（P0.05）for the contents of organic carbon,microbial biomass carbon and K2SO4-extractable carbon in soil aggregates among different forest types,which the characteristics were Larixgmeliniplantationnatural secondary forestPinus sylvestris var.mongolica plantation.（2）Under different vegetation restorations,soil organic carbon and microbial biomass carbon presented an increasing trend along with increasing of particle size of aggregate,and the large aggregates were significant higher amounts of both the soil organic carbon and microbial biomass carbon than the micro aggregates（P0.05）,the K2SO4-extractable carbon mainly distributed in the 1~0.5mm particle size and larger size aggregate.（3）The organic carbon and microbial biomass carbon in soil aggregates mainly distributed in soil surface layer（0—5cm）,which the contents decreased with the increase of soil depth.Except2mm and 2~1mm aggregates,the contents of K2SO4-extractable carbon in soil aggregates presented a decreasing trend along with the increase of soil depth.（4）Microbial biomass carbon had significant positive correlations（P0.01）with soil organic carbon and K2SO4-extractable carbon,revealing that microbial biomass carbon had close relationship with soil organic carbonand K2SO4-extractable carbon.

关 键 词：大兴安岭 火烧迹地 土壤团聚体 微生物量碳 K2SO4浸提碳 

分 类 号：S714.3[农业科学—林学]