【摘 要】
：
Broad-leaved Korean pine mixed forest,which has important ecological value,is the climax vegetation in Northeast of China,and Changbai Mountains is an ideal area to study the positive and negative fee
【机 构】
：
Northeast Forestry University,Harbin 150040,China
【出 处】
：
International Symposium on Forest Soils(2013年森林土壤国际研讨会)
论文部分内容阅读
Broad-leaved Korean pine mixed forest,which has important ecological value,is the climax vegetation in Northeast of China,and Changbai Mountains is an ideal area to study the positive and negative feedback of temperate forest on precipitation variation.In this study,we analyzed the spatial heterogeneity of soil bacteria at the depth of 0~5 cm and 5~10 cm,and thizosphere soil at 30%increase in precipitation,30%decrease in precipitation and the control plots in broad-leaved Korean pine mixed forest of Changbai Mountains.There are 2991 81 valid sequences we sequenced in total,and 271496 sequences through optimized,average sequence are 33242 for each soil sample.The results showed that the diversity and the richness of soil bacteria decreased with soil depth.The diversity and evenness of soil bacteria responded differently for precipitation variation in two layers of topsoil,and the diversity and evenness of thizosphere decreased as precipitation increased.The dominant microorganism population in different precipitation plots were same,Proteobacteria,Acidobacteria,Planctomycetes,Actinobacteria and Chloroflexi.Precipitation variation did not change the type of advantage bacterium group but change its abundance.The response mechanism of dominant microorganism population for precipitation variations was different with each other.From the sample similarity,we found that precipitation variations influenced the soil bacterial community composition,and the response magnitude of topsoil differed from thizosphere.
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