松嫩平原寸草苔种群生殖分株的种子生产与生殖分配策略

Strategy of reproductive allocation and seed production on reproductive ramets in Carex duriuscula populations in the Songnen Plain of China

在松嫩平原 ,寸草苔种群生殖分株种子生产数量 ,在休闲放牧场为 (15.2 5± 2 .78)粒 /穗 ,在割草场为 (11.4 4± 2 .2 4 )粒 /穗。籽粒千粒重休闲放牧场为 (1.5873± 0 .10 54) g ,割草场为 (1.4 6 4 6± 0 .2 333)g。生殖分株的生物量及其穗与籽粒各组分重量均为随着高度级的增加呈规律性增加 ,但穗重占全株重比率的生殖分配Ⅰ和籽实重占全株重比率的生殖分配Ⅱ均随着高度级的增加呈直线形式减少。不同生长状况的生殖分株对有限资源具有不同的分配策略。

The mean number of seed production per ear of reproductive ramets was 15.25 ±2.78 in resting plot after grazing , and 11.44±2.24 in cutting plot in Carex duriuscula populations in the Songnen Plain of China. The weight of one thousand seeds was 1.587 3 g± 0.105 4 g in resting plot after grazing, and 1.464 6 g±0.233 3 g in cutting plot. All the biomass of the reproductive ramet and the weight of its ear or grain increased with the height classesof the ramets regularly, but the reproductive allocation Ⅰ(RAⅠ)andⅡ(RAⅡ)which were the ratios of ear to ramet and seeds to ramet in weight respectively decreased with the height classesof the ramets linearly. Strategies that the reproductive ramets allocated theirdefinite energy vary with the different conditions of growth.