Effects of stocking rate and grazing time of yaks on soil nutrient contents in Kobrecia parva alpine meadow

Abstract

Abstract: The results of grazing trial about yaks for two years showed that in summer,contents of different soil stratums and average contents of 0～20cm stratum for organic matter (OM),organic carbon (OC),total nitrogen (TN),total phosphorus (TP) and available phosphorus (AP) were negatively correlated with stocking rate with a linear regressive relationship,while it was quadratic regression between contents of available nitrogen (AN) and stocking rate.In winter,contents of different soil stratums and average contents of 0～20cm stratum for OM,OC,TN were negatively correlated with stocking rate linearly,while those of TP,AP and AN were quadratically correlated with stocking rate.In summer pasture,with the increase of stocking rate,contents of AN for different stratums decreased with depth.When stocking rate was 1.07,1.08 and 1.22 heads·hm^-2 respectively,contents of AN for 0～5 cm,5～10 cm and 10～20 cm in sequence reached the minimum value.In winter pasture,contents of TP,AP and AN for 0～5 cm,5～10 cm and 10～20 cm,respectively reached the maximum value when stocking rate was 0.81,0.78 and 1.00 heads·hm^-2,1.03,1.09 and 1.03 heads·hm^-2,and 1.36,1.35 and 1.30 heads·hm^-2,respectively.In addition,in summer pasture,average contents of AN for 0～20 cm soil stratum reached the minimum value when stocking rate was 1.07 heads·hm^-2,while contents of TP,AP and AN were the maximum at 0.90,0.83 and 1.21 heads·hm^-2 respectively in winter pasture.

Key words: Soil particle fraction, Organic carbon, Total nitrogen, Distribution

CLC Number:

S812

DONG Quanmin, ZHAO Xinquan, MA Yushou, LI Qingyun, WANG Qiji, SHI Jianjun. Effects of stocking rate and grazing time of yaks on soil nutrient contents in Kobrecia parva alpine meadow[J]. cje, 2005, (7): 729-735.

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