古尔班通古特沙漠三种生境下梭梭种群的生殖分配特征

对古尔班通古特沙漠梭梭种群进行样地调查,从各构件生物量分配特征、开花和结果特征、不同发育阶段的生殖分配、同化枝与生殖生物量之间关系等方面研究了3种生境下梭梭种群的生殖分配特征。结果表明:3种生境中各构件生物量分配格局均具有显著差异,且变化趋势不一致,梭梭平均生殖分配在0.64%～1.5%;3种生境下,梭梭开花和结果特征均具有显著差异,表现出砾石生境>沙质生境>土质生境。不同生境梭梭生殖分配均随径级的增加变化不同,砾石生境和沙质生境样地随着径级的增加而降低,而土质生境样地随着径级的增加而增加;不同生境类型下梭梭同化枝、生殖生物量与径级的关系不同;梭梭的生殖分配和同化枝生物量之间呈线性或多项式正相关。

Reproductive allocation characteristics of Haloxylon ammodendron populations in three habitats of Gurbantunggut Desert

An investigation was conducted on the Haloxylon ammodendron populations in three different habitats of Gurbantunggut Desert to study the reproductive allocation characteristics of the populations in the habitats from the aspects of the biomass allocation in different modules,flowering and fruiting,reproductive allocation at different development stages,and relationships between assimilative shoots and reproductive biomass.There existed significant differences in the biomass allocation in different modules among the three habitats,and the allocation patterns varied with the habitats.The average reproductive allocation in the three habitats was 0.64-1.5%.The characteristics of flowering and fruiting in the habitats also differed significantly,with the sequence of gravel habitat > sandy habitat > loam habitat.The reproductive allocation in the habitats varied with the increase of tree size.In gravel and sandy habitats,the reproductive allocation decreased with increasing tree size;but in loam habitat,it was in adverse.There was a linear or multinomial positive correlation between the biomass of assimilative shoots and the reproductive biomass.