单 位：
青海省果洛州草原站;中国科学院西北高原生物研究所;青海省畜牧兽医科学院
关键词：
牦牛放牧率;混播禾草草地;地上生物量;地下生物量;江河源区
摘 要：
江河源区2龄和3龄混播草地(垂穗披碱草+星星草)牦牛放牧试验结果表明:在两个放牧季内,不同处理组的地上生物量开始阶段逐渐增加,之后逐渐下降,且随放牧率的增加同一时期地上生物量减小;2003年从7月20日开始、2004年从8月5日开始至9月20日,不同放牧率下同一时期的地上生物量差异显著(P<0.05);各放牧处理区2003年同一时期的地上生物量均高于2004年,且牧草生长季节地上平均生物量及其年度变化之间的差异显著(P<0.05)。此外,不同放牧率下同一时期各土壤层地下生物量及其百分比组成、相同放牧强度下不同时期各土壤层地下生物量及其百分比组成均没有明显的趋向性变化;牧草生长季节地上平均生物量与放牧强度之间呈线性回归关系,0~30cm的地下生物量(包括活根和死根)与放牧强度之间呈二次回归关系;牧草生长季节地上与地下平均生物量之间呈二次回归关系,说明轻度放牧和中度放牧能刺激牧草的生长,具有补偿或超补偿生长的特点。
译 名：
Effects of Yaks Stocking Rates on Primary Productivity And Its Dynamic Changes for Mixed-Sown Sward of Elymus nutans/Puccinellia tenuflora in Yangtze and Yellow River Headwater Region
作 者：
DONG Quan-min~(1,2),ZHAO Xin-quan~1,MA Yu-shou~2,LAI De-zhen~3(1.Northwest Plateau Institute of Biology,The Chinese Academy of Science,Xining 810001,China;2.Qinghai Academy of Animal and Veterinary Sciences,Xining 810003,China; 3.Guoluo Prefecture Grassland Station of Qinghai Province,Dawu Township 814000,China)]
关键词：
Yaks stocking rate;Mixed-sown pasture with perennial grasses;Aboveground biomass;Underground biomass;Yangtze and Yellow River headwater region
摘 要：
The result of grazing trial for yaks in two-and three-year mixed-sown pasture of Elymus nutans + Puccinellia tenuflora in Yangtze and Yellow River headwater region showed that: during two grazing seasons,aboveground biomass of different treatments gradually increased in the beginning,and then gradually decreased,and with the increase of stocking rate,aboveground biomass for the same phases decreased;from the 20th of July in 2003 and the 5th of August in 2004 to the 20th of September every year,aboveground biomass for the same stages under different stocking rate had significant difference(P<0.05);aboveground biomass of every treatment for the same period in 2003 was more than that in 2004,respectively,and aboveground average biomass and its annual changes were significantly different under different stocking rate(P<0.05).Moreover,during grazing for two seasons,underground biomass and its percentage composition for the same depth and time under different stocking rates,and for the same depth and different time under the same stocking rates,had neither tropism changes;there was a linear regression relationship between aboveground average biomass of forage growing season and stocking rate,and a quadratic regression relationship between underground biomass of 0～30cm depth(including living and dead root) and stocking rates.Finally,there was a quadratic regression relationship between above-and underground biomass in forage growing season,which showed that light and moderate grazing could activate the growth of forage,and had compensating and overcompensating growth.
