摘要
通过小区控制放牧实验,研究呼伦贝尔草甸草原不同放牧强度下草地土壤微生物和酶活性的变化。结果表明:不同处理土壤微生物数量表现为细菌>放线菌>真菌。不同土层土壤微生物总数不放牧处理大于放牧处理,0～30 cm土层土壤微生物生物量碳、氮含量在轻牧区较高,在中牧区较低。土壤脲酶和过氧化氢酶活性轻度放牧和中度放牧高于不放牧和重度放牧。土壤微生物数量、生物量、土壤蛋白酶和过氧化氢酶活性均随土壤深度的增加呈递减趋势。相关分析表明,土壤微生物数量、微生物生物量以及土壤酶活性相互之间密切相关,土壤微生物量N与细菌达到极显著正相关(P<0.01),与真菌和放线菌呈显著相关(P<0.05)。土壤微生物量C与真菌达到极显著负相关(P<0.01),与放线菌呈显著负相关(P<0.05)。土壤微生物数量、土壤微生物量N与转化酶、蛋白酶、过氧化氢酶活性呈显著或极显著正相关。土壤微生物量C与转化酶、蛋白酶、过氧化氢酶呈显著负相关(P<0.05)。
The accounts and biomasses（carbon and nitrogen） of the microorganisms and enzyme activities in soil under different grazing intensities in meadow steppe in Inner Mongolian Region were studied.The accounts showed in an order of bacteria actinomycetes fungi.The total account of the microorganisms in soil was greater for no-grazing treatment than for grazing treatments.The biomasses of the microorganisms in top 0-30 cm soil layer reached the highest value for the lightly grazing treatment,and was the lowest for the moderately grazing treatment.The urease and catalase activities in soil were higher for both lightly and moderately grazing treatments than for no-grazing and heavily grazing treatments.The accounts and biomasses of the microorganisms,and activities of protease declined with depth of the soil layer.There were positive correlations between the microorganism account and biomass and the enzyme activities.The total N content in the microorganisms was significantly and positively correlated with the bacterial account（P0.01）,and with the quantities of actinomycetes and fungi（P 0.05）.The total C content in the microorganisms was significantly and negatively correlated with the fungi quantity（P0.01）,and with the actinomycetes quantity（P0.05）.The account and the total N mass of the microorganisms were significantly and positively correlated with the activities of invertase,protease and catalase in soil.The total C mass in the microorganisms was negatively correlated with the activities of invertase,protease and catalase（P0.05）.
出处
《生态环境学报》
CSCD
北大核心
2011年第2期259-265,共7页
Ecology and Environmental Sciences
基金
公益性行业(农业)科研专项(201003019
201003061
200903060)
现代农业产业技术体系建设专项资金资助
