摘要
对采自上海市区14个样点的二球悬铃木叶片发育稳定度、叶片气孔密度和气孔长径进行研究。结果表明,在3个采样时期,根据叶片宽度确定的非稳态不对称指数(FA1)和根据叶片侧脉长度确定的偏向性不对称指数(RDA1)在不同环境胁迫程度(UESL)下均表现出显著的差异,但进一步分析表明,各样点FA1与环境胁迫程度UESL之间呈显著的非线性回归关系,而RDA1与环境胁迫程度之间却未显示类似关系。此外,FA1与叶片气孔密度和气孔长径之间的显著相关关系表明,它们可共同作为指示小尺度上环境胁迫的有效指标,而RDA1是叶片的一种正常发育状态参数,并不适于反映环境胁迫状态。
The development stability indices including leaf width based fluctuating asymmetry (FA1) and lateral vein length based directional asymmetry(RDA1) of Platanus acerifolia were studied,with all the leaves sampled from 14 sites categorized with different urban environmental stress levels(UESL) in Shanghai city.The stomatal density and stomatal length were investigated as the subsidiary indices to test the availability of developmental stability indices as the indicator under the stressful environment.The results showed that there was significant difference between FA1 and RDA1 under different environmental stresses during the 3 sampling periods.Between FA1 and UESL,a significant negative correlation was derived,i.e.,FA1=0.029-0.0009UESL+0.0003UESL^2(r=0.7665,P=0.0014),while similar trend was not found between RDA1 and UESL.The significant correlations between FA1 and leaf stomatal length and stomatal density implied that they could be used as indicators for urban stress levels at small scale.RDA1 was possibly the normal parameter during leaf development but unsuitable to be as the indicator of urban stresses.
出处
《生态学杂志》
CAS
CSCD
北大核心
2005年第7期719-723,共5页
Chinese Journal of Ecology
基金
国家自然科学基金项目(39930040)
复旦大学青年科研基金资助项目(EXH591330)。
关键词
上海
二球悬铃木
发育稳定度
城市环境胁迫
Shanghai,Platanus acerifolia,developmental stability,urban environmental stress.
