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为了探明蒙古沙冬青(Ammopiptanthus monglicus)根围土壤微生物分布和土壤因子生态作用,2012年6月选取内蒙古磴口、阿拉善左旗和乌拉特后旗3个样地,按0-10、10-20、20-30、30-40、40-50cm5个土层采集根围土壤样品,系统研究了土壤微生物数量和生态分布。结果表明:五大类土壤微生物数量及分布与蒙古沙冬青及样地生态条件有关,不同样地不同土层微生物数量差异显著,垂直动态分布明显。3样地均是细菌>芽孢菌>放线菌>固氮菌>真菌。0-20cm土层显著高于其它土层,最大值均在10-20cm,并随土层加深,数量有减少趋势。同一土层,磴口的土壤细菌、芽孢菌、固氮菌、放线菌显著高于乌拉特后旗和阿拉善左旗;乌拉特后旗的真菌显著高于磴口和阿拉善左旗。相关性分析表明:土壤细菌、真菌和放线菌均与土壤有机C、碱解N和碱性磷酸酶极显著正相关。
In order to explore the soil microbial distribution and the ecological role of soil factors in the rhizosphere of Ammopiptanthus monglicus, three plots were selected from Chengkou, Alashan and Wulatehouqi of Inner Mongolia in June 2012, -20,20,30,30-40,40-50cm5 soil samples collected from the rhizosphere soil, the systematic study of soil microbial quantity and ecological distribution. The results showed that the quantity and distribution of soil microbes in five major types of soil were related to the Mongolian sandy soils and the ecological conditions of the plots. There was significant difference in the number of microbes in different soil layers and obvious vertical dynamic distribution. 3 samples were bacteria> Bacillus> actinomycetes> Azotobacter> fungi. 0-20cm soil layer was significantly higher than other soil layers, the maximum value of 10-20cm, and with the soil depth, the number of decreasing trend. Soil bacteria, Bacillus sp., Azotobacter and actinomycetes in the same soil layer and mouth area were significantly higher than those in Wulatehouqi and Alashanzuoqi. The Wulatehouqiqi fungi were significantly higher than those in Yingkou and Alashanzuoqi. Correlation analysis showed that: soil bacteria, fungi and actinomycetes were significantly and positively correlated with soil organic C, alkaline hydrolysis N and alkaline phosphatase.