Quantitative characters and reproductive allocation dynamics on reproductive ramets of Carex duriuscula populations in different habitats in the Songnen Plains of China

GUO Li-hua~(1,2), YANG Yun-fei~1, LI Jian-dong~1(1.Institute of Grassland Science, Northeast Normal University, Key Laboratory of Ecological Restoration and Ecosystem Management of Jilin Province, Key Laboratory for Vegetation Ecology, Ministry of Education, Changchun 130024, China; 2.Department of Biology, Hainan Normal University, Haikou 571158,China)

Carex duriuscula populations; reproductive tillers; quantitative characters; reproductive allocation; mowing range; rest reserved

Through sampling measure on 6 communities in 3 habitats which are the single dominant species community and mixed species community on the mowing plot, rest plot in mowing range and fired plot in perennial rest reserved range in the Songnen Plains of China, the quantitative characters and space-time dynamics of reproductive allocation on reproductive ramets of Carex duriuscula populations was researched in the flowering stage and the ripening stage. From the flowering stage to the ripening stage, the change ranges were the consistency on the height and biomass of the reproductive ramets, which increased the average of 211% and 207% respectively; the length of spikes increased the average of 9%, but the biomass of spikes increased 152%. The space variability on reproductive allocation was low in the flowering stage and increased in the ripening stage in different plots. The relationships,between reproductive allocation and the height and biomass of reproductive ramets,formed which is linear and tended to be stable gradually in most of populations after flowering stage.