Effects of different vegetation coverage on microbial functional diversity in black soil
Effects of different vegetation coverage on microbial functional diversity in black soil
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作者：
Pei Xi-chao
为探讨开垦前后黑土微生物代谢活性和功能多样性的变化，选取海伦农业生态试验站21年开垦和未开垦的农田、草地和裸地，采用Biolog方法研究了黑土微生物代谢活性和功能多样性的季节变化。土壤微生物的平均井色发展指数（AWCD）和Shannon多样性指数均以草地最高，农田次之，裸地最低，农田和草地的土壤微生物代谢活性和功能多样性均表现出夏高秋低的趋势;在裸地，这两个指标随着季节的变化而逐渐升高，三种土壤微生物利用效率或利用强度较高的碳源均为碳水化合物、氨基酸和羧酸。
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.