| 马衔山多年冻土与季节冻土区土壤微生物量及酶活性的季节动态 |
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| 引用本文： | 李红琴,徐海燕,马小亮,胡广录,吴晓东,刘桂民.马衔山多年冻土与季节冻土区土壤微生物量及酶活性的季节动态[J].冰川冻土,2017,39(2):421-428. |
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| 作者姓名： | 李红琴 徐海燕 马小亮 胡广录 吴晓东 刘桂民 |
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| 作者单位： | 兰州交通大学环境与市政工程学院,甘肃兰州,730000;中国科学院西北生态环境资源研究院冰冻圈国家重点实验室青藏高原冰冻圈观测研究站,甘肃兰州,730000 |
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| 摘 要： | 为了研究马衔山多年冻土区和非多年冻土区土壤微生物碳氮、土壤酶活性的差异,选取多年冻土区、季节冻土区和交界区为对象,分析了0~30 cm土层微生物碳氮和转化酶、脲酶、中性磷酸酶、淀粉酶、过氧化氢酶、多酚氧化酶酶活性不同季节的变化特征。结果表明:全氮、总有机碳、微生物量碳氮与多数土壤酶之间呈显著相关关系。在不同区域,土壤微生物碳氮均在0~10 cm含量最高,10~20 cm次之,20~30 cm最低。土壤微生物碳氮在生长季表现为含量逐渐增加,但是多年冻土区与季节冻土区差异不大。土壤酶活性在深度方面表现与微生物碳氮含量变化一致。土壤酶并无的季节变化规律。在多年冻土区,转化酶、多酚氧化酶和磷酸酶活性明显高于非多年冻土区。本研究表明,尽管多年冻土区的植被和土壤总有机碳明显高于非多年冻土区,其土壤微生物碳氮含量相当,且一些土壤酶活性也相当。说明非多年冻土区土壤的生物地球化学相对强度较大。因此,多年冻土退化后可能会导致生态系统的退化。
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| 关 键 词： | 微生物生物量 土壤酶活性 多年冻土 季节动态 |
The seasonal dynamics of soil microbial biomass and enzyme activities in permafrost area and seasonally frozen ground area of the Maxian Mountain |
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| Abstract: | To investigate the differences of seasonal dynamics of soil microbial biomass and enzyme activities between permafrost areas and seasonally frozen ground areas,the permafrost area,seasonally frozen ground area and their junctional zone in the Maxian Mountain were selected as an investigating object.The invertase,urease,neutral phosphatase,amylase,catalase and polyphenol oxidase activities,as well as the microbial biomass C and N in the depth range from 0 to 30 cm were analyzed.Correlation analyses demonstrated that there were significant correlations among total nitrogen,total organic carbon,microbial biomass carbon and soil enzyme activity.The highest values of microbial C and N appeared in the depth range of 0 ～ 10 cm,followed by 10 ～20 cm,with the lowest depth range of 20 ～ 30 cm.During the growing season,the microbial C and N were increasing,while the microbial C and N showed no significant differences among the three areas.The enzyme activities showed similar patterns as those of microbial C and N at various depths.There were no clear seasonal patterns of the enzyme activities.In permafrost area,the invertase,neutral phosphatase and polyphenol oxidase activities were significantly higher than those of seasonally frozen ground.It was clear that although there were great differences in ecosystems,such as vegetation cover and soil organic matter content,the microbial C and N among in the permafrost area and non-permafrost area were comparable.In addition,the soil enzyme activity showed some similarity between permafrost and non-permafrost areas,indicating that the biogeochemical cycle was intensified more in non-permafrost regions.These results suggested that the permafrost degradation would lead to ecosystem degradation. |
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| Keywords: | microbial biomass soil enzyme permafrost seasonal change |
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