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不同植被覆盖对黑土微生物功能多样性的影响

孟庆杰1,2;许艳丽1;李春杰1;韩晓增1;裴希超1,2   

  1. 1中国科学院东北地理与农业生态研究所, 哈尔滨 150081;2东北林业大学, 哈尔滨 150040
  • 收稿日期:2007-12-04 修回日期:1900-01-01 出版日期:2008-07-10 发布日期:2008-07-10

Effects of different vegetation coverage on microbial functional diversity in black soil.

MENG Qing-jie1,2;XU Yan-li1;LI Chun-jie1; HAN Xiao-zeng1;PEI Xi-chao1,2   

  1. 1Northeast Institute of Geography and Agricultural Ecology, Chinese Aca
    demy of Sciences, Harbin 150081, China; 2Northeast Forestry University, Ha
    rbin 150040, China
  • Received:2007-12-04 Revised:1900-01-01 Online:2008-07-10 Published:2008-07-10

摘要: 为探讨黑土开垦前后土壤微生物代谢功能多样性差异,在海伦农业生态试验站长期定位试验区,采用Biolog方法研究了不同季节草地、农田和裸地等3个利用时间相同(21年)的生态系统土壤微生物功能多样性的动态变化。结果表明:在春季和夏季,土壤微生物平均颜色变化率(AWCD)和Shannon多样性指数均表现为草地最高,农田次之,裸地最低;在草地和农田生态系统中,土壤微生物代谢活性和功能多样性随季节变化趋势均为夏季升高,秋季降低;在裸地生态系统中,土壤微生物代谢活性和功能多样性随季节变化呈逐渐升高趋势;在草地、农田和裸地生态系统中,土壤微生物群落利用率较高的3类碳源是糖类、氨基酸类和羧酸类。

关键词: 土地利用变化, 产沙变化, 黄土高原

Abstract: In order to approach the microbial metabolic activity and functional diversity in black soil before and after reclamation, the cropland, grassland, and bare land with 21 years utilization or unreclaimed in the Hailun Agroecological Experimental Station were selected, and Biolog method was adopted to study the seasonal variations of the metabolic activity and functional diversity. The results showed that in spring and summer, the average well color development (AWCD) and the Shannon diversity index of soil microbes were the highest in grassland, followed by in cropland, and in bare land. In cropland and grassland, soil microbial metabolic activity and functional diversity exhibited a trend of high in summer and low in autumn; while in bare land, these two indices raised gradually with seasonal change. In the three lands, the carbon sources with higher utilization efficiency or utilization intensity by soil microbes were carbohydrates, amino acids, and carboxylic acids.

Key words: Land use change, Sediment production, Loss Plateau