东北退化草地恢复演替系列两种无性系植物种群互动格局

It is an orderly process on replacement between dominant species in the community succession. Based on space instead of time, continuous sampled and measured method in different mixed ratio of community sections, the mutual changes on populations of two clonal plants, Leymus chinensis and Kalimeris integrifolia were analyzed in restoration succession series in Northeast degraded meadow, China. The results showed that there are the biological characteristics of eventually win such as rhizome reproduction and growth advantage of winter ramets in the early growing season in L. chinensis populations in the succession. There were the strategies of survival and development by adjusting the size of ramets to ensure the relatively stable number in the two mixed populations. The fluctuation and instability were higher in K. integrifolia population than in L. chinensis population. The density/diomass of K. integrifolia population was a linear decrease with L. chinensis population increase from the middle to the end periods of the growing season. The density and taproot biomass of K. integrifolia population was a logarithmic function decrease with biomass/cumulative length of rhizome increase of L. chinensis population in the late and the end periods of growing season. The rhizomes of L. chinensis population were to expand exponentially into K. integrifolia community. After dominant species replaced by L. chinensis, K. integrifolia would maintain its companion species status in the community for a long time.