论文部分内容阅读
紫茎泽兰(Eupatorium adenophorum)是我国主要外来入侵植物之一,在我国西南地区迅速传播,引起了巨大的经济损失。本文比较研究了不同光强下生长14个月的(透光率RI分别为10%、20%、30%、55%、100%)紫茎泽兰幼苗的生物量分配、叶片形态和生长反应特性。结果表明:紫茎泽兰在不同的光强条件下显示出极强的叶生态适应性。植株总生物量随光强升高而增加(RI从10%到55%),但在全光照下总生物量反而有所下降。株高也随光强增大(RI从10%到30%)而增大,但到达一定程度(RI30%)后,株高反而下降。在弱光照条件下,从比叶面积(SLA),叶面积比(LAR)和比茎长(SSL)等指标表明,植物通过叶片变薄、变大增加单位生物量的叶面积来捕获光能。随着光强的升高,平均相对生长速率增加,在本试验尺度下,RI在55%左右达到平均相对生长速率最大值。植株在RI为30%–55%下生长状况好于全光照条件下的幼苗。在高遮荫条件下能阻止其它生物的生存和生长,这可能是紫茎泽兰强入侵性的一种生态适应策略。结论:紫荆泽兰对光照强度拥有极强的生态适应性,可能是紫荆泽兰入侵性比较强的重要原因之一。图3参26。
Eupatorium adenophorum (Eupatorium adenophorum) is one of the major alien invasive plants in China. It spread rapidly in the southwest of China, causing huge economic losses. In this paper, the biomass allocation, leaf morphology and growth response of Eupatorium adenophorum seedlings under different light intensities for 14 months (light transmittance RI of 10%, 20%, 30%, 55%, 100%, respectively) characteristic. The results showed that Eupatorium adenophorum showed extremely strong leaf ecological adaptability under different light intensity. The total plant biomass increased with light intensity (RI from 10% to 55%), but the total biomass decreased under full light. Plant height also increased with light intensity (RI from 10% to 30%) and increased, but reached a certain level (RI30%), the plant height instead decreased. Under low light conditions, indicators such as specific leaf area (SLA), leaf area ratio (LAR), and specific length of the stem (SSL) indicate that plants capture light energy by thinning the leaves and increasing the leaf area per unit of biomass . With the increase of light intensity, the average relative growth rate increased. Under the experimental scale, RI reached the maximum relative average growth rate at 55%. Plants grew better under RI at 30% -55% than under full sunlight. Under the conditions of high shading can prevent the survival and growth of other organisms, which may be strong invasion of Eupatorium adenophorum an ecological adaptation strategy. CONCLUSION: Zeeland has strong ecological adaptability to light intensity, which may be one of the important reasons for the strong invasion of Bauhinia. Figure 3 Reference 26.