Abstract:

Study the replacement control effect on invasive weed Ageratum conyzoides with five pasture species in order to provide prevention and control reference for Ageratum conyzoides. A replacement field experiment was conducted to evaluate the restoring effect of the field invaded by Ageratum conyzoides. In this study, five replacement control modles, which were formed by five pasture species (Lolium multiflorumLam. L., Sorghum bicolor Moench, Lolium perenne L., Trifolium repens, Pennisetum americanum) that were mixed grown with target plant Ageratum conyzoides respectively with the proportions of about 2:1. Then monitored the plants population and community indexes on set date for evaluating the replacement control effect on invasive weed Ageratum conyzoides resulting from five pasture species. The replacement field experiment results showed that for Lolium multiflorumLam. L., the plant height was not obstructed, coverage was dominant, community Simpson index and Shannon-wiener index turned larger, and the important value of Ageratum conyzoides turned smaller. For Lolium perenne L., all of the community index value was similar to the Lolium multiflorumLam L. except Shannon-wiener index. For Sorghum bicolor Moench, Trifolium repens and Pennisetum americanum, in spite of coverage was dominant, and community Simpson index turned larger, but the plant height was obstructed, the Shannon-wiener index turned smaller, and the important value of Ageratum conyzoides turned larger. The above description indicated Lolium multiflorumLam L. and Lolium perenne L. could effectively control Ageratum conyzoides, but Sorghum bicolor Moench, Trifolium repens and Pennisetum americanum had almost no effect in preventing and controlling Ageratum conyzoides in replacement field experiment.