不同水分条件下筇竹无性系的生态适应性研究

The Ecological Strategy of Clonal Growth of Qiongzhuea tumidinoda Under Different Levels of Water Resource Supply

对不同水分条件下筇竹无性系生长的形态可塑性进行了研究,并分析了自适应的对策。结果表明:在土壤水梯度环境下,筇竹形态特征表现出明显的适应性变化;随着水分资源有效性的提高,其分株的高度、直径、分枝长度、分枝角度、叶面积、隔离者长度、隔离者直径、无性系总生物量相应增加,分株密度和隔离者总长度则相应减小;在水分资源有效性较低的生境中,无性系生长则选择水资源相对丰富的微生境放置分株,以克服异质性给水分吸收带来的困难,体现了筇竹无性系生长的觅食行为及趋利避害的生态适应性。

On the basis of the field investigation,the morphological plasticity and ecological strategy of Qiongzhuea tumidinoda clones under different levels of water resource supply were studied in the paper.The results showed that:It is obvious that the morphological plasticity of Qiongzhuea tumidinoda clones under conditions of different water resource supply.Clones under the high level of water resource supply had long and thick spacers and large biomass and the height,diameter,branching length,branching angle,leaf area of ramets were also great.Ramets density and total spacer length,however,were less.Clonal growth of Qiongzhuea tumidinoda under the low level of water resource supply seemed to allow a foraging strategy and increased the probability of ramets growing in favorable microhabitat in order to acquire the relative abundant water resource and keep away from a site of less water resource.