Ecology Research On Reproductive Module Of Six Species Of Dogstails In Yinchuan Plain

This study described the mechanism of propagation members of ecology of six grass species with the method of combined surveying field plots with analysising the samples of laboratory. The samples came from wetlands ditch, such as ditch side, beaches, hills, sandy, wasteland, roadside and so on, in Yinchuan Plai, which the sampling time was from mid-June2012-the spike of Leymus, four species of plants belonging to Calamagrostis and Achnatherum splendens started to grow-to the end of growing season of the three studies grass. This study analyzed the dynamic laws of the changes and allocations of the member of biomass of the various research grasses, combining with the indicators of environmental factors and the relationship of modular biomass. The main conclusions are as follows:1. The rate and allocation ratio of sexual reproduction of the grasses are low. The distribution ratio of sexual reproduction of the six grasses generally changed between2%and15%, and the nutrition reproductive allocation accounted for the vast majority of plant species reproductive allocation reproductive allocation nutrition species accounted for the vast majority of reproductive allocation. The reproductive growth rate generally changed between9%and18%, with the growth of the reproductive member was weak and even many of them can not reach the level of solid. The members of each grass biomass allocation are generally:stem biomass components> rhizome biomass components> leaf biomass components> Flower member biomass.2. Through comparative studying has a different characteristic between6species populations. The natural grass populations fluctuated of smaller plots within a growing season Clonal populations, June and July appears density peaks, and more volatile large, several grasses reproductived components population’s flower components similar to others and that in mid-August reached a peak biomass. Splendens’biomass was the biggest than other6planted species biomass in the total biomass, followed by the Calamagrostis ningshiaensis, and Calamagrostis the minimum. Rhizome biomass components was secalimus largest Leymus and species Calamagrostis similarly, although the largest biomass Splendens populations, but relative to its flowers very small proportion of biomass components, indicating the mode of reproduction in general with completing form tillers, and sexual reproduction was extremely low; while the population of each trended similar to that the early reproductive in the growing season, modular biomass, stem diameter, leaf length were increased rapidly, and reached a peak in the reproductive period, decreasing reproductive lately. Only members began to prepare the plant roots winter bud growth for winter.3. Through principal component analysis to environmental factors of which six species plant knows:Calamagrostis four species, Leymus populations are mainly affected by soil moisture, soil salinity and soil pH, but splendens population is affected by soil salinity, soil-speed nitrogen and soil organic matter. While the distribution of plant populations affected by the soil moisture, were also affected by soil salinity that affecting their natural distribution of the main reason.In the Ming Lake area mainly grows Calamagrostis pseudophragmites and Calamagrostis ningshiaensis populations. Analysis of environmental indicators and population biomass knowing that components significant correlation between soil pH and Calamagrostis pseudophragmites’leaf biomass, linear function available y=1.54x+17.765(R2=0.943),to represent soil moisture and Calamagrostis ningshiaensis component and flowers biomass were significantly correlation, respectively represented with y=1.6286x2.34(R2=0.8787), and y=0.3421x1.6833(R2=0.6009). In the horse farm plots, it is soil salinity, soil pH and Calamagrostis macrolepis rhizome biomass components were significantly correlated, their relationship were available linear function y=48.016x+12.699(R2=0.6788) and the natural logarithm function y=109.06Ln (x)-217.05(R2=0.6646). In Yinchuan plain areas, different parts of grass plants studied ecological restoration and reconstruction in different niche. The Lai grass and Splendens were no significant correlation, between Calamagrostis four species genus, Calamagrostis ningshiaensis showed a strong water-loving, the best growth conditions with moderate soil moisture, and soil drought and water stress were hindering its growth, especially the growth of sexual reproduction, and Calamagrostis macrolepis and Calamagrostis pseudophragmites show some salinity for confrontational environment adaptability, In extreme environments, developed the roots continue to grow under the protection of soil for creating opportunities of future generations continue, but also the key to its success overwintering.