Distribution of soil microorganism in Larix gmelinii forests of the Great Xing’an Mountains,Inner Mongolia
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摘要: 采用稀释平板法,在内蒙古大兴安岭森林生态系统定位站研究了5种不同林型的土壤微生物数量组成及垂直分布特征。结果表明,兴安落叶松Larix gmelinii林中分布的微生物以细菌占优势,占微生物总数量的80.19% ~ 96.83%;微生物的总数量是杜香Ledum palustre-兴安落叶松林(28.85 106个g-1)>草类-兴安落叶松林(20.67 106个g-1)>柴桦 Betula fruticosa-兴安落叶松林(10.08 106个g-1)>火烧迹地(2.95 106个g-1)>皆伐兴安落叶松林(2.07 106个g-1);细菌是杜香-兴安落叶松林(27.18 106个g-1)>草类-兴安落叶松林(19.80 106个g-1)>柴桦-兴安落叶松林(9.76 106个g-1)>火烧迹地(2.69 106个g-1)>皆伐兴安落叶松林(1.66 106个g-1);真菌是皆伐兴安落叶松林(28.05 104个g-1)>柴桦-兴安落叶松林(20.86 104个g-1)>杜香-兴安落叶松林(12.20104个g-1)>草类-兴安落叶松林(7.93 104个g-1)>火烧迹地(7.32 104个g-1);放线菌数量是杜香-兴安落叶松林(15.44 105个g-1)>草类-兴安落叶松林(7.94 105个g-1)>火烧迹地(1.86 105个g-1)>皆伐兴安落叶松林(1.28 105个g-1)>柴桦-兴安落叶松林(1.08 105个g-1)。土壤中,微生物垂直分布除杜香-兴安落叶松林、草类-兴安落叶松林、柴桦-兴安落叶松林的放线菌为10 ~ 20 cm高于0 ~ 10 cm,其他均是随着垂直深度的增加,各类微生物数量逐渐减少。不同林型土壤微生物的数量、类型及垂直分布存在显著差异(P<0.05)。图4表1参15Abstract: The soil microbial distribution of bacteria,fungi,and actinomycetes in five different Larix gmelinii forests[(A) Ledum palustre-Larix gmelinii virgin forest,(B) herbage-Larix gmelinii virgin forest,(C) Betula fruticosa-Larix gmelinii virgin forest,(D) Larix gmelinii forest burned-over areas,and (E) clearcut Larix gmelinii forest] in 0 - 10,10 - 20,20 - 30 cm soil layers was studied in the National Forestry Ecosystems Station of Inner Mongolias Great Xingan Mountains using the dilution-plate method. Results showed that in the different forest types,soil microbes varied in quantity,category,and vertical distribution(P<0.05). Also,bacteria were dominant accounting for 80.2% - 96.8% of the microorganisms. Numbers of all microorganisms in the Larix gmelinii forests were in the order:A>B>C>D>E;whereas bacteria were A>B>C>D>E,fungi were E>C>A>B>D,and actinomycetes were A>B>D>E> C. In virgin forests actinomycetes in the 10 - 20 cm layer were greater than the 0 - 10 cm layer;but vertical distribution of bacteria and fungi decreased(P<0.05) with the increasing vertical depth.[Ch,4 fig. 1 tab. 15 ref.]
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Key words:
- forest soil science /
- Larix gmelinii /
- soil microorganism /
- distribution characteristics
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链接本文:
https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2010.02.011
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