高寒草甸上应用狼毒净后续5年狼毒及牧草产量变化趋势研究

近年来，狼毒（Stellera chamaejasme Linn.）已成为高寒草甸上主要毒杂草之一，严重影响了草地畜牧业的发展。为了有效防除狼毒，在高寒草甸上喷施750 mL/ hm2剂量的狼毒净，结果表明：该药剂对狼毒的防治效果明显，施药后第2年防效达97.4%，施药后续5年内防效都保持在90%以上，短期内不会成灾；施药后单子叶牧草增产明显，施药后第2年增产率达17.5%，第3年到第5年增产率分别为19.6%、18.1%和16.0%，增产幅度稳定。双子叶牧草在施药当年和第2年无明显增产效果，施药后的第3年、第4年和第5年分别增产15.1%、17.2%和14.2%，增产效果明显。

Dynamics of Stellera chamaejasme population and forage yields 5 years after application of the herbicide Langdujing in highland meadows

Stellera chamaejasme Linn. has become one of the primary toxic weeds in highland meadows in recent years, and prataculture and animal husbandry were seriously affected. The herbicide Langdujing was sprayed at 750 mL/ hm2 in order to control the weed effectively. The results showed that the control efficacy of Langdujing against S.chamaejasme was 97.4% in the second year after application of this herbicide, with a total efficacy of over 90% 5 years after application. Monocotyledon forage yields increased obviously, with an increase rate of 17.5%, 19.6%, 18.1% and 16.0%, respectively, from the 2nd to 5th years after application. Dicotyledon forage yields did not increase in the 1st and 2nd years, but significantly increased in the 3rd through 5th years, with an increase rate of 151%, 17.2% and 14.2%, respectively.