作　　者： ; ; ; ; ; (刘伟）; (阿德列提）;

机构地区： 中国科学院新疆生态与地理研究所

出　　处： 《草业学报》 2010年第5期218-226,共9页

摘　　要： 以巴音布鲁克草原生态研究站附近建植4,8,15和20a高寒人工草地及天然草原0a(CK)为研究对象,对土壤微生物数量、土壤酶活性及其与土壤因子关系进行了研究。结果表明,5种不同建植期的微生物类群总数表现出4a>8a>0a>15a>20a,微生物组成以细菌最多,放线菌次之,真菌最少,且上层(0～20cm)土壤微生物数量大于下层土壤的(20～40cm);细菌、真菌及放线菌数量均在8月达到最大值,9月最小。土壤过氧化氢酶活性大小与微生物总数排列顺序一致,脲酶活性则为4a>8a>0a>20a>15a,同时,2种土壤酶活性均表现出上层大于下层的特点。逐步回归分析表明,速效氮和脲酶活性是影响该地区土壤微生物总数的主要因子;全磷和有机质是影响土壤脲酶活性的重要因子;全磷和pH值是影响土壤过氧化氢酶活性主要土壤因子。 The artificial grassland in Bayanbulak was used as an example to examine the relationship between soil microorganism numbers,enzyme activities,and soil factors over different lengths,0（CK）,4,8,15 and 20 years of cultivation.The numbers of soil microorganisms increased initially,reached maximum at 4years,and then decreased with time.The order of microbial numbers in all grasslands was bacteria〉actinomycete〉fungi. The numbers of soil microorganisms in the 0-20cm soil layer was higher than that in the 20-40cm layer. Soil microbes reached their maximum and minimum in August and September,respectively.The order of soil catalyse activities was the same as that of microbe numbers,but the order of soil urease activity was 4〉8〉0 20〉15years.However,the two enzyme activities were higher in the 0-20cm soil layer than those in the 20- 40cm layer.Stepwise regression showed that the numbers of soil microorganisms,soil urease activity,and catalase activity were mainly affected by available nitrogen and by urease activity,total phosphorus and soil organic matter,total phosphorus and pH value,respectively.

关 键 词： 人工草地 不同建植期 土壤微生物 土壤酶活性 巴音布鲁克

领　　域： [农业科学] [农业科学] [农业科学] [农业科学] [农业科学]