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《Acta Agrestia Sinica》 2010-04
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Effect of Grazing Disturbance on Soil Microorganisms and Soil Enzyme Activities of Stipa baicalensis Rosev.Steppe

WENDU Ri-le1,ZHANG Jing-ni2,LI Gang2,YI Jin1,ZHANG Yong-sheng2,YANG Dian-lin2 (1.Agricultural College,Inner Mongolia Agricultural University,Hohhot,Inner Mongolia Autonomous Region 010018,China;2.Agro-Environmental Protection Institute,Ministry of Agriculture,Tianjin 300191,China)  
In order to provide scientific basis for protection,restoration and reconstruction of Stipa baicalensis Rosev.steppe ecosystem,the effect of different grazing disturbance levels on the soil microorganisms,soil enzyme activities,soil nutrients,and soil respiration of S.baicalensis steppe was studied and the interrelationship among them was analyzed.The results show that the total number of soil microorganisms reduced significantly(P0.05) along with the increasing of grazing intensity,the number of microorganisms in different grazing areas showed the same changing trends: bacterianitrogen germactinomycetesfungi;higher in soil depth 0~10 cm than 10~20 cm in the vertical distribution.The activities of soil urease,catalase,invertase,and phosphatase reduced significantly(P0.05) with the increasing of grazing intensity and showed similar vertical distribution as microorganisms did.The soil nutrients and soil moisture also reduced significantly(P0.05) when the grazing intensity increased.However soil pH and bulk density increased gradually and showed significant difference(P0.05) under different grazing pressures.Correlation analysis indicates that the soil enzyme activities were positively related to soil microorganisms and soil nutrients.Fungal quantity had a high-positive correlation with urease activity(P0.05),the number of nitrogen germ was extreme-significantly correlated with urease activity(P0.01) and soil total phosphorus was high-positively correlated with invertase and phosphatase(P0.05).
【Fund】: 国家自然科学基金(30770367);; 中国农业科学院院长基金资助
【CateGory Index】: S812.2
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