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《Acta Agrestia Sinica》 2017-04
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Study on Changes of Soil Nutrients and Plant Community of Stipa breviflora Steppe under Different Grazing Intensities

WANG Tian-le;WEI Zhi-jun;LIU Wen-ting;BAI Yu-ting;ZHANG Shuang;DING Li-jun;XIAO Jia-pu;LV Shi-jie;College of Grassland,Resource and Environmental,Inner Mongolia Agricultural University;College of Science,Inner Mongolia Agricultural University;  
In this study,we investigated the soil physical and chemical properties of Stipa breviflora desert grassland under different grazing intensities in Inner Mongolia,China.An experimental design with three treatments was used,including No Grazing(NG),Moderation Grazing(MG)and Heavy Grazing(HG).The results showed that the soil bulk density increased significantly with grazing intensity increasing(P0.05),soil bulk density increased the greatest under the heavy grazing throughout the year;while soil water content decreased with grazing intensity increasing,and soil water content in 0~20 cm decreased significantly under heavy grazing(P0.05).The content of soil organic matter decreased firstly and then increased with the increase of soil depth.Grazing had no significant effect on soil available phosphorus and total potassium while soil available potassium was the highest under moderation grazing in the whole year.Grazing reduced above ground biomass and the litter on the ground.There was a linear positive correlation between above ground biomass and litter biomass.
【Fund】: 国家自然科学基金项目(31460126);; 国家重点基础研究发展计划(2014CB138805);; 内蒙古自治区2016年博士研究生科研创新项目(B20161012906Z)资助
【CateGory Index】: S812
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