不同氮素条件下雷竹克隆生长的比较研究

对雷竹在不同氮素梯度中的无性系生长的形态可塑性和生物量投资分配格局进行了野外实验研究。结果表明 :随着土壤氮素含量的增加 ,雷竹无性系分株增多 ,无性系生物量增大。在不同氮素梯度下 ,雷竹无性系分株根茎长度和隔离者长度存在显著差异 ,随着土壤氮素含量的提高 ,无性系分株根茎长度和隔离者长度显著降低。这说明雷竹无性系分株根茎和隔离者具有很强的形态可塑性。但无性系根茎总长、根茎节间长度和分枝角度在不同土壤氮素含量条件下没有明显变化。在较低的氮素供应条件下 ,雷竹无性系把更多的生物量投资于地下部分 ,以便从土壤中获取更多的氮素营养。

Comparative Research on Clonal Growth of Phyllostachys praecox in Different Conditions of Soil Nitrogen Content

Morphological plasticity and allocation pattern f biomass of f phyllostachys praecox clone were studied in different conditions of soil nitrogen content. The results showed that, with the increase of soil nitrogen content, the ramet number and biomass of clone increased. Rhizome length of ramet and length of spacer had significant difference between the different conditions of soil nitrogen content, indicating the rhizome and spacer had great morphological plasticity. Total length of clone, internode's length and branching angle had no significant difference between the different treatments. In the condition of lower soil nitrogen content, the clone invested more biomass to underground part, to absorb more nitrogen from soil.