异龄差不嘎蒿地上生物量的分配格局

Above-ground biomass allocation pattern of Artemisia halodendron plants in relation to plant age

主要研究了科尔沁沙地中,同一生境(流动沙地)条件下不同龄级(3,4,5龄)差不嘎蒿的生物量分配格局.采用收获法选取了90株(每个龄级30株)差不嘎蒿,分别测定每个样株的冠幅、高度、单株重、生殖枝重、营养枝重和种子产量,并计算了生殖比、营养比和种子比.结果表明:流动沙地中的差不嘎蒿以无性繁殖为主;种子的生物量分配与植株地上总生物量及植株年龄之间存在正相关;差不嘎蒿在地上资源(生物量)的分配过程中存在明显的负耦联关系.

This paper examined above-ground biomass allocation pattern of Artemisia halodendron plants in shifting sandy lands and three age gradients (3, 4 and 5-years-old) in the Horqin Sandy Land of Inner Mongolia, China. In this habitat 90 individuals of A. halodendron plants (30 individuals in each age gradient) were sampled. For each sampled plant, canopy size, height, total plant above-ground biomass, flowering shoot mass, vegetative shoot mass and seed mass were determined. Based on these measurements, reproductive ratio (flowering shoot mass/total plant biomass), vegetative ratio (vegetative shoot mass/total plant mass) and seed ratio (seed mass/total plant mass) were calculated for each plant. Several conclusions have been drawn from this study: in the shifting sandy land, A. halodendron plants survived mainly through asexual reproduction; Regressions showed a positive relationship between seed mass and total above-ground plant biomass & plant age when the data were analyzed; There was a trade-off in the biomass allocation of A. halodendron plants.