不同遮阳率对蒜头果幼苗生长及生物量分配的影响

Response of Malania oleifera Seedling Growth and Biomass Allocation to Different Light Intensities

利用遮阳网产生的不同光照强度设80%、40%、无遮阳3种遮阳条件,研究遮阳率变化对1年生蒜头果幼苗苗木质量的影响。结果表明:随着遮阳率增加,幼苗地径、叶片数、主根长、一级根数、一级根长及各器官生物量先增加后减少;不同遮阳率下蒜头果幼苗之间各器官生物量分配存在显著差异(P<0.05),表现为80%遮阳率时,地上部分生物量分配较多而根系分配较少,随着遮阳率降低蒜头果幼苗选择优先于根系生长;遮阳率过高会导致蒜头果幼苗根系生长受到限制,反之则致使地上部分发育困难,40%遮阳率蒜头果幼苗发育均衡,质量最佳。

The effect of shading rate changes on the quality of one-year Malania oleifera seedlings was studied using 3 shading conditions:80%,40%,and no shading(0%),using different light intensities generated by shading nets.The results showed that as the shading rate increased,the seedling ground diameter,leaf number,main root length,primary root number,primary root length,and biomass of each organ first increased and then decreased;there are significant differences(P<0.05)in biomass allocation among different organs of M.oleifera seedlings under different shading rates.This is reflected in the fact that when the shading rate is 80%,the aboveground biomass is more allocated and less allocated to the root system.As the shading rate decreases,M.oleifera seedlings choose to prioritize root growth;a high shading rate can limit the growth of the root system of M.oleifera seedlings,while conversely,it can make it difficult for the aboveground parts to develop.When the shading rate is 40%,the development of M.oleifera seedlings is balanced and the quality is the best.