江河源区披碱草和星星草混播草地土壤物理性状对牦牛放牧强度的响应

Study on responses of soil physical character to stocking rate of yaks on mixed sown pastures of perennial grasses in Yangtze and Yellow Rivers source region

在江河源区披碱草Elymusnatans+星星草Puccinelliatenuflora混播人工草地上研究了牦牛放牧强度对土壤物理性状的影响,2年的试验结果表明:随着放牧强度的增加,不同土壤层含水量均呈降低趋势,土壤容重、土壤坚实度呈增大趋势。相关分析表明,放牧强度与不同土壤层含水量呈极显著的负相关(P<0.01),与土壤容重和坚实度呈极显著的正相关(P<0.01),而且土壤容重和坚实度均具有累积效应。

Effect of stocking rate on soil physical character has been studied on mixed sown pasture of perennial grasses (Elymus natans+Puccinellia tenuflora ) in Yangtze and Yellow Rivers source region The results showed: with the increase of stocking rates, water contents of different soil stratums decreased, and soil bulk density and hardness increased Furthermore, correlative analysis showed that stocking rate was significantly and negatively correlated with water contents of different soil stratums ( P <0 01), and significantly and positively correlated with soil bulk density and hardness ( P <0 01) Soil bulk density and hardness have accumulation effect