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以天然草地、由天然草地转化成的农用坡耕地和22年生小叶杨人工林3种土地利用方式为研究对象,分析了土壤微生物生物量碳与土壤养分的变化规律,以揭示土壤微生物生物量碳与土壤养分对不同土地利用方式的响应规律,为内蒙古农牧交错带的生态建设提供依据。结果表明:不同土地利用方式明显影响土壤微生物生物量碳的含量,且3种不同土地利用方式土壤微生物生物量碳含量差异显著(P<0.05),表现为22年生小叶杨人工林>天然草地>农用坡耕地;不同土地利用方式土壤微生物生物量碳的垂直分布表现为随土壤深度的增加而降低;土壤微生物生物量碳与速效钾、全氮、pH以及容重呈显著相关关系,说明土壤微生物生物量碳可作为衡量土壤质量变化的重要敏感指标。
Taking natural grassland, farmland sloping farmland converted from natural grassland and 22-year-old Populus simonii plantation as the research object, the variation law of soil microbial biomass carbon and soil nutrient was analyzed to reveal the soil microbial biomass carbon And the response of soil nutrients to different land use patterns, which provided the basis for the ecological construction in the ecotone between agriculture and animal husbandry in Inner Mongolia. The results showed that different land use patterns significantly affected soil microbial biomass C, and there were significant differences in soil microbial biomass C between the three different land use patterns (P <0.05). The results showed that: the 22-year-old Populus simonii plantation> natural grassland> The vertical distribution of soil microbial biomass carbon in different land use patterns decreased with the increase of soil depth. There was a significant correlation between soil microbial biomass carbon and available potassium, total nitrogen, pH and bulk density, indicating that soil microbial community Carbon can be used as a sensitive indicator of soil quality changes.