Effect of herbicide Langdujing on Stellera chamaejasme control and impact on forage grass yield of alpine meadow

The rapid spread of Stellera chamaejasme is speeding up the degradation of alpine meadow in recent years. Herbicide Langdujing was used to control S. chamaejasme at three dosages (675 mL/ha, 750 mL/ha and 825 mL/ha). The result showed that the height, coverage, fresh and dry weight of S. chamaejasme were inhibited by spraying Langdujing in the first year, but the control effect was not obvious. In the second year, it was applied at levels of 750 mL/ha and 825 mL/ha, the control effect was significant (94%), meanwhile, the yield of monocotyledon forage grasses was increased by 15.24% and 17.64% respectively, and the yield of dicotyledon forage grass was not changed. It could be concluded that the dosage of 750 mL/ha was proper for practical application.