摘要
选取甘肃玛曲高寒草甸6个样地,对各样地的土壤微生物季节动态及其与土壤理化因子的关系进行了分析。结果表明,在土壤微生物中细菌数量占绝对优势,季节变化对土壤微生物有较大的影响,土壤微生物与土壤肥力有较为密切的关系。细菌在4月出现高峰;放线菌数量春季到秋季数量逐渐减少;真菌数量春季到秋季变化不明显,冬季略有增加;氨化菌、硝化菌则大多在4和10月较多;反硝化菌在7月稍多;好气性固氮菌、好气性纤维素分解菌则在1月数量较多。主成分分析结果表明,好气性固氮菌和好气性纤维素分解菌对该地区土壤肥力有较大的贡献。典型相关分析结果表明,仅有的一组典型变量的相关是由细菌、真菌、氨化菌、反硝化菌与土壤pH值、电导率、硝态氮、氨态氮、速效磷、全磷的相关性引起的。
The seasonal dynamics of different soil microbes and their relationships with soil physicochemical factors were studied. The soil samples were taken from six sampling points of alpine meadow located in Maqu of Gansu. The results showed that soil bacteria occupied absolute advantage among soil microbes. Seasonal variation had a great influence on soil microbial activities. Soil microbes and soil physicochemical factors had close relationship. The peak value of bacteria quantity in soil appeared in April. Actinomycetes number decreased gradually from spring to autumn, while activities of fungi were stable. Ammonifier and nitrobacteria had more activities in April and October; denitrifier had more in July; and amounts of aerobic nitrogen-fixing bacteria and aerobic cellulose decomposer were more in January. The results of main com- position analysis of soil microbial quantity showed that aerobic nitrogen-fixing bacteria and aerobic cellulose decomposer offered more contribution to soil fertility. The results of canonical correlation analysis showed that there was only one group of canonical variable correlation, which was caused by bacteria, fungi, ammonifier, denitrifier and soil pH value, conductivity, nitrate nitrogen, ammoniacal nitrogen and total phosphorus.
出处
《草业科学》
CAS
CSCD
北大核心
2012年第2期189-197,共9页
Pratacultural Science
基金
国家自然科学基金项目(30960078
30870273)
2009年度人事部留学人员科技活动择优资助项目
关键词
高寒草甸
土壤微生物
季节动态
土壤理化因子
alpine meadow
soil microbes
seasonal dynamic
soil physicochemical factors
