Study On Biology Characteristics And Control Of Aconitum Leucostomum Worosch

Because of overgrazing and other factors, Aconitum leucostomum Worosch, which is rangeland poison plants spreading in Yili river valley, has seriously affected the development of animal husbandry. And it has been increasingly concerned by local government that how to effectively prevent the spread of Aconitum leucostomum, improve rangeland utilization and develop animal husbandry. This research has been carried out on Aconitum leucostomum botany and biology characteristics, community ground biomass dynamic and community soil seed bank dynamic in May～Sept. 2005 in Nalati, Xinyuan County, as well as the chemical control effects of nine herbicides taken in. The results as follows:(1) Aconitum leucostomum turns green early, grows rapidly, has strong ecological adaptability and regenerates poorly. Its ground biomass change is a single peak curve, dry biomass increases with the growth period and reaches peak at 715.5g/plants in mid-July. Since then, because of turning yellow, transferring nutrients and etc., community of Aconitum leucostomum ground biomass declines, but the declining trend is slowly.(2) Community begins to turn green in mid-last April; branch in mid-last June; community ground biomass dynamics reaches its peak in mid-last July, at 2470g/m2; pod in mid-August; mature in mid-September. The whole growth period is about 140~160d. The community ground biomass and height are synchronization, also the maximum simultaneously appear.(3) There have different quantity of Aconitum leucostomum seeds in 0~10cm, 10~20cm, 20~30cm in the community(Aconitum leucostomum + grass+ herabarums). The quantity ratio of Aconitum leucostomum seed is range to 8.6%~35.2% in all points, with an average of 19.8%. Aconitum leucostomum seed number have little change in 0~10cm, 10~20cm, 20~30cm among different points. There is little change on species composition in different points.(4) The effect of chemistry control is various greatly in different herbicides. 2,4-D bufylate, MCPA-Na, Garlon are better for control in single-spraying, the best dose all is 1.2% of the three herbicides, and 2,4-D bufylate is best in single-spraying; 2, 4-D bufylate + Banvel, MCPA-Na+ Banvel are better for control in mix-spraying, the best dose is 1.0%, and 2, 4-D bufylate + Banvel is best in mix-spraying. The best period of chemistry control is in the green period of Aconitum leucostomum.