摘要
通过盆栽试验研究了透光率在100%、66%、20.5%和9%的4个光照梯度下,马蹄金的生物量分配及形态特征。结果表明:随着遮光程度的增加,单株的生物量表现出先上升后下降的趋势,在66%透光率下生物量达到最高值;单株生物量分配随着遮光度的增加也发生了改变,其中叶生物量比及叶柄生物量比增加,根生物量比下降,茎生物量比表现出先增大后减小的趋势;随着遮光程度的增加,茎节间长度逐渐增加,分枝角度减小,茎长、分枝强度、叶面积、叶柄均呈先增大后减小的变化趋势。综合分析表明,马蹄金对光环境有一定的适应能力,适度遮光有利于马蹄金的生长、构件数量的增加和生物量的积累,强光或严重遮光均不利于其生长发育。
A pot experiment was conducted to study the characteristics of Dichondra repens under different levels of biomass shading allocation and morphological （ 100%, 66%, 20. 5%, and 9% transparency）. With the increase of shading, the biomass per plant decreased after an initial increase, being the maximum under 66% transparency. The biomass allocation per plant also varied with increasing shading. Leaf mass ratio and petiole mass ratio increased while root mass ratio decreased, and stem mass ratio increased first and decreased then. The branching angle decreased with increasing shading , and the stem length, branching intensity, leaf area, and petiole length decreased after an initial increase. D. repens had definite adaptability to varied light environment. Moderate shading benefited the growth and development of D. repens, i. e. , increased the modular numbers and biomass accumulation, while high light intensity or high shading did harms to D. repens growth.
出处
《生态学杂志》
CAS
CSCD
北大核心
2009年第7期1419-1422,共4页
Chinese Journal of Ecology
基金
安徽省高校自然科学基金重点项目(2006kj060a)
安徽省高校生物环境和生态安全重点实验室专项资金资助项目(2004sys003)
关键词
马蹄金
遮光
生物量分配
形态特征
Dichondra repens
shading
biomass allocation
morphological characteristics.
