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《Acta Agrestia Sinica》 2017-04
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Effects of Summer Rotational Grazing of Yak and Tibetan Sheep on Decomposition of 3 Kinds of Plant Litter on Alpine Meadow

ZHANG Jian-wen;YANG Hai-lei;XU Chang-lin;CHEN Lu-jun;XIAO Hong;CHAI Jin-long;PAN Tao-tao;YU Xiao-jun;College of Pratacultural Science,Gansu Agricultural University/Key Laboratory of Grassland Ecosystem,Ministry of Education/Pratacultural Engineering Laboratory of Gansu Province/Sino-U.S.Centers for Grazingland Ecosystem Sustainability;  
In order to understand the effect of grazing intensity of domestic animal species yak and Tibetan sheep on the decomposition of litter in the alpine grassland of Qinghai Tibet Plateau,the loss rate and carbon,nitrogen and phosphorus content of Elymus nutans,Kobresia humilis and Polygonum viviparumlitter were measured using the litter bag method in the summer of Tianzhu alpine meadow.The results showed that the loss rate of 3 kinds of litters increased with the increase of treatment time and the grazing intensity.After 15 months of treatment,loss rate of E.nutans,K.humilis and P.viviparum litter ranged from 24.71% to 32.70%,30.56% to 38.83%,and 32.27% to 42.96%,respectively.The loss rate of litters from Tibetan sheep grazing was less than that from yak.Under the same grazing livestock and grazing intensity,E.nutans loss rate was significantly lower than K.humilis and P.viviparum.Meanwhile,the carbon content of the 3 kinds of litters decreased with grazing intensity increasing.The carbon content of E.nutans litter was higher than that of K.humilis and P.viviparum,and the decreasing order of carbon content was P.viviparum,K.Humilis and E.nutans.N content of three kinds of litters showed a decrease trend with the increase of grazing intensity,while showed decreased firstly,andincreased,then decreased with the grazing time increasing.With the increase of grazing intensity,the phosphorus content of P.viviparumlitter showed a decreasing trend;but with the grazing time increasing,phosphorus content of P.viviparumlitter generally showed an increasing trend.Tibetan sheep and yak had inhibitory effect on the concentration of phosphorus,but the effect of yak was greater than Tibetan sheep.
【Fund】: 国家自然科学基金(31360570)资助
【CateGory Index】: S812.8
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