Leaf development stability of Platanus acerifolia under urban environmental stress and its implication for environmental indicator

Abstract

Abstract: 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+0.0003UESL²(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.

Key words: Optimized N management, Soil nitrate-N content, Apparent N losses, Crude protein content

CLC Number:

Q945.11

ZHANG Hao, WANG Xiangrong. Leaf development stability of Platanus acerifolia under urban environmental stress and its implication for environmental indicator[J]. cje, 2005, (7): 719-723.

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