天山北坡退化草地土壤环境与微生物数量的关系

通过对天山北坡退化草原微生物区系的试验,研究微生物区系与退化程度、与土壤水分系数的关系。结果表明,未退化草原土壤中微生物总数量最多,中度退化草原土壤中的微生物总数量最少。退化草原微生物区系中10～20cm土壤层的微生物数量比0～10cm土壤层的微生物数量多。微生物区系中,真菌数量与土壤速效钾、有效磷、全磷呈显著正相关,与氮微弱正相关,与土壤容重、密度呈显著正相关。细菌、放线菌数量与pH值呈极显著正相关。极度退化土壤的碱解氮、全氮、速效钾、全钾、有效磷、全磷、有机质、总盐含量、pH均最大。

Relationship between the number of three main microorganisms and the soil environment of degraded grassland on the north slope of the Tianshan Mountains

The relationship between microbial flora, degradation, and soil moisture factors were studied on the microbial flora in degenerated grassland of Tianshan north hillside. The microbial population was largest where there was no degradation and smallest where three was moderate degradation. The microbial population in the 10-20 cm soil layer was larger than that in the 0-10 cm layer. The bigger the soil moisture factor, the larger was the microbial population. Fungi were distinctly correlated with fungal K, available phosphorus and total phosphorus, but weakly positively correlated with nitrogen and positively correlated with density. Bacteria and Antinomies were both significantly positively correlated with pH. The alkali-hydrolyzable nitrogen, total nitrogen, available K, total K, available P, total P, organic matter, total salt contents and pH value were all highest in extremely degraded soil.