Responses of two submerged plants to invasive plants at different water depths and growth periods
In order to investigate the responses of submerged plants to different species of invasive plants in different water depths and growth periods,two wetland invasive plants,Eichhornia crassipes and Cabomba caroliniana,and two common native submerged plants,Hydrilla verticillata and Potamo-geton crispus,were selected to investigate the response of native submerged plants to two invasive plants in different water depths(0.2,0.4 m)and growth periods(early growth and peak growth)through simulation experiments.The results showed that the water depth of 0.4 m was more favorable to the growth of H.verticillata and could weaken the negative effect of invasive plants on the growth of H.verticillata,while the water depth had no significant effect on the growth of minced grass;the invasive plant species did not have a significant effect on the growth of native submerged plants,but there were differences in the mode of influence,in which C.caroliniana tended to inhibit the growth of native sub-merged plants,while E.crassipes could inhibit the growth of native submerged plants indirectly by de-creasing the transparency of the water body and the content of total phosphorus.Total phosphorus con-tent indirectly inhibited the growth of native submerged plants.In addition,the negative impacts of inva-sive plants on native submerged plants were more pronounced during the early stage of growth than those during the peak growth period of native submerged plants.These results suggested that there were differences in the mechanisms of the invasive effects on the growth of native submerged plants,and that native submerged plants were more resistant to the two invasive plants in the appropriate water depth and during the peak growth period.
NETL
NSTL
万方数据
维普
