Clonal Architecture and Ramet Population Characteristics of Leymus chinensis from Different Habitats in the Xilin River Watershed Clonal Reproductive Property and Community Characteristic of Invasive Species Coreopsis lanceolata Clonal architecture and ramet population characteristics of Lysimachia congestiflora growing under different light conditions Ramet population characteristics and biomass allocation of Eremosparton songoricum growing under different water conditions