中国农业科学Issue(23)：4628-4637,10.DOI:10.3864/j.issn.0578-1752.2014.23.011
不同放牧强度下温性草甸草原土壤生物性状及与地上植被的关系
The Relationship Between Temperate Meadow Steppe Soil’s Biological Properties and Aboveground Vegetation Under Different Grazing Intensities
摘要
Abstract
[Objective]The number of the soil microorganisms and soil enzyme are sensitive indexes for soil quality and ecosystem functional changes, it’s an important biological indicator for evaluating soil ecosystem degradation under interference conditions. This study focused on relationship between soil’s biological properties and aboveground vegetation under different grazing intensities, which explained the soil and plant degradation process and mechanism under grazing, thus giving a theoretical basis for ecological restoration of degraded grassland.[Method] Based on the cattle grazing control experiment carried out in the temperate meadow steppe in the Hulunbeir Grassland, the number of soil microorganisms and soil enzymes activity changes under four different grazing intensities (control area G0.00: 0.00 Au·hm-2, light grazing G0.23: 0.23 Au·hm-2, moderate grazing G0.46: 0.46 Au·hm-2 and heavy grazing G0.92: 0.92 Au·hm-2) were monitored, and the relationship between soil’s biological properties and aboveground vegetation indexes was analyzed. [Result]The maximum number of ammonifying bacteria, oligotrophic azotobacter microorganisms, oligotrophic cellulolytic microorganisms appeared in the treatment of light grazing G0.23;the maximum number of aerobe azotobacter, oligotrophic azotobacter appeared in the treatment of moderate grazing G0.46. Except for catalase, the activities of alkaline phosphatase, urease and invertase decreased significantly as grazing intensity increased (P<0.05) . The tendency of vegetation coverage, biomass and vegetation diversity indexes obviously decreased with the increase of grazing gradient. The soil bacterial physiological functional groups (except Nitrifying bacteria) were positively correlated with the species richness of aboveground vegetation, vegetation coverage, community diversity indexes and biomass; the soil alkaline phosphatase and urease activities showed a significant positive correlation with vegetation coverage, community diversity indexes and biomass (P<0.05).[Conclusion]The temperate meadow steppe soil’s biological properties showed different degrees of change under different grazing intensities, soil enzyme activities represented the current state of soil ecological system better than the microorganism community, and it had a better correlation with aboveground vegetation indexes.关键词
放牧/地上植被/土壤微生物生理群/土壤酶Key words
grazing/above-ground vegetation/soil bacterial physiological functional groups/soil enzyme引用本文复制引用
谭红妍,闫瑞瑞,闫玉春,陈宝瑞,辛晓平..不同放牧强度下温性草甸草原土壤生物性状及与地上植被的关系[J].中国农业科学,2014,(23):4628-4637,10.基金项目
国家公益性行业（农业）科研专项（201303060）、国家现代农业产业技术体系建设专项（cars-35）、国家科技合作项目（2012DFA31290）、国家科技支撑计划课题（2012BAC19B00）、国家青年科学基金 （）
