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《Acta Prataculturae Sinica》 2008-05
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Vegetation roots and soil physical and chemical characteristic changes in Kobresia pygmaca meadow under different grazing gradients

WANG Chang-ting1,WANG Qi-lan1,JING Zeng-chun1,FENG Bing-fu2,DU Yan-gong1,LONG Rui-jun3,CAO Guang-min1 (1.Northwest Institute of Plateau Biology,Chinese Academy of Science,Xining 810001,China;2.Qinghai Profession and Technology College of Animal and Veterinary,Huangyuan 812100,China;3.Pastoral Agriculture Science and Technology College of Lanzhou University,Lanzhou 730070,China)  
Field surveys and experimental analysis were used to detect the relationship between spatial changes of vegetation roots and soil environmental factors under different grazing gradients in an alpine meadow.The experimental plots were located in the Haibei alpine meadow ecosystem research station.There were obvious changes of root distribution in the Kobresia pygmaca meadow community,in the soil quantity attached to roots,the ratio of roots to soil weight,the variation of plant community structure and function,and in the change of soil physics and chemistry characteristics under grazing disturbance.With increased grazing intensity the ratio of roots to soil in the 0-10 cm soil layer was enhanced as the quantity of soil gradually decreased.Most rhizomes died because the ability of soil to supply resources decreased thus return of soil organic matter to the soil decreased,and sustainable utilization of vegetation was reduced resulting in converse succession(or degenerate succession) in the grassland.The effects of soil bulk density,soil moisture,total N,NO3——N,and NH4+-N contents on vertical distribution of vegetation roots(0-40 cm) and ratio of roots to soil in different grazing gradients were more significant than those of other soil properties.The soil environment and nutrients were influenced by grazing which changed the grassland community biomasses(both above and below-ground biomass).
【Fund】: 国家自然科学重点基金项目(30730069);; 中国科学院野外台站基金项目资助
【CateGory Index】: S812
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