【摘要】 采用全球定位系统(GPS)采集了横断山北部高山区35个样点的土样,用稀释平板法对该区细菌、真菌和放线菌进行分离计数,并分析了微生物数量与土壤养分、土壤水分、土地利用方式和pH等因子的相关性。结果表明,该区域3大类土壤微生物数量表现为细菌>放线菌>真菌。土壤微生物数量在不同区域表现为松林口>雀儿山>折多山;林地微生物比草地丰富,但不及草地微生物均衡。微生物数量与土壤理化因子间的相关分析表明,放线菌数量与pH呈显著正相关,真菌数量与土壤全钾含量呈极显著正相关。更多还原

【Abstract】 With the help of GPS(Global Position System),thirty-five surface soil samples were collected from the northern alp region of Hengduan Mountains in Qinghai-Xizang Plateau.The quantities of soil fungi,bacteria and actinomycetes were determined by dilution plate technique,and their correlations with soil fertility, soil humidity,land-use type,and soil pH were analyzed. The results showed that in this region,soil microbial quantity was decreased in the order of bacteria >actinomyces >fungi,and Songlinkou>Que’er Mountain>Zheduo Mountain.Forestland was richer in microbes than grassland,but the proportion of various microbes in forestland was lower than that in grassland.A significant positive correlation was observed between soil actinomycetes quantity and soil pH value,and between soil fungal quantity and soil total potassium content.更多还原