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为了解气候变暖情景下雪被减少对冬季土壤微生物特征的影响,采用人工遮雪的方法,研究了雪被去除对原始冷杉林土壤微生物生物量和可培养微生物数量的影响.结果表明:雪被去除显著影响土壤微生物生物量碳(MBC)和氮(MBN)以及可培养细菌和真菌数量,但土壤微生物在雪被覆盖不同阶段具有不同的响应特征.在雪被去除处理下,土壤有机层MBC和MBN在雪被形成初期和雪被融化前期显著降低,而在雪被覆盖期和雪被融化后期显著增加;在雪被形成初期至雪被覆盖期,可培养细菌数量都显著降低,但可培养真菌数量都显著增加.雪被融化后,雪被去除显著降低土壤有机层MBC和可培养真菌数量,显著增加可培养细菌数量,对MBN无显著影响.矿质土壤层MBC、MBN和可培养微生物数量在雪被去除下的变化趋势与土壤有机层基本一致,但波动较小.雪被去除还改变了川西高山冷杉林冬季土壤微生物类群比,提高了土壤可培养真菌数量的冬季优势.
In order to understand the effect of snow reduction on soil microbial characteristics in winter, the effects of snow removal on soil microbial biomass and the number of cultivable microorganisms in the fir forest were studied by artificial snow cover.The results showed that snow Soil microbial biomass MBC and MBN, and the number of bacteria and fungi that could be cultured were significantly affected by removal, but the soil microorganisms had different response characteristics at different stages of snow cover.When the snow was removed, the soil organic layer MBC and MBN decreased significantly in the early stage of snow formation and before the snow melted, but significantly increased in the late stage of snow cover and snow melted. During the initial period of snow formation, the number of culturable bacteria decreased significantly, however, The number of culturable fungi increased significantly.If the snow was thawed, the removal of snow significantly reduced MBC and culturable fungi, significantly increased the number of culturable bacteria and had no significant effect on MBN.Copper soil MBC and MBN could be cultivated The changing trend of microbial population under the removal of snow was basically the same with that of soil organic layer, but the fluctuation was small.The removal of snow also changed the winter soil Soil microflora ratio increased the winter advantage of soil culturable fungi.