首页|不同遮光处理对2种园林植物光合参数的影响

不同遮光处理对2种园林植物光合参数的影响

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  • NETL
  • NSTL
  • 万方数据
  • 维普
以3a生小叶扶芳藤和三叶地锦幼苗为材料,用 LI－6400型光合仪测定全光照、40％遮光和70％遮光处理下其叶片净光合速率(Pn)、蒸腾速率(Tr)和水分利用效率等光合参数日动态特征,分析比较不同遮光处理对小叶扶芳藤和三叶地锦光合特性的影响.结果表明：不同遮光处理下,三叶地锦叶片Pn日变化均表现为单峰曲线,小叶扶芳藤叶片Pn日变化在全光照和40％遮光处理下呈单峰曲线,70％遮光处理下呈双峰曲线.小叶扶芳藤和三叶地锦Pn日均值、日最大值均在全光照处理下达到最大,小叶扶芳藤在40％、70％遮光处理下Pn峰值分别比全光照下降57．80％、80．24％,三叶地锦叶片Pn峰值下降55．1％、76．86％.随着遮光处理的加重,小叶扶芳藤和三叶地锦叶片Tr均呈下降趋势,40％、70％遮光处理下小叶扶芳藤叶片最大Tr分别比全光照显著下降46．68％、55．60％,三叶地锦叶片最大Tr比全光照处理下降41．48％、74．00％；不同遮光处理下小叶扶芳藤和三叶地锦叶片水分利用效率日均值均表现为全光照＞70％遮光＞40％遮光.小叶扶芳藤和三叶地锦较喜光,但对弱光也有一定的利用能力,能有效运用于城市园林绿化.
Effects of shading on photosynthetic parameters of two kinds of garden plant
In order to obtain the photosynthetic physiological parameters on dynamic characteristics such as leaf net photoG synthetic rate (P n ),transpiration rate,water use efficiency of two kinds of garden plant to different light conditions,the physG iological parameters on dynamic characteristics of three– year-old Euonymus fortune var.minimus Rhed and Parthencissus semicordata were measured by LI-6400 portable photosynthesis system.We analyzed the effects of shading on photosynthesis between E.fortune var.minimus Rhed and P.semicordata.The results showed that:in different shading treatment,the diurG nal variation of Pn of the P.semicordata presented a single-peaked curve.Under full illumination of shading,40% of shading treatment,the diurnal variation of Pn of E.fortune var.minimus Rhed presented a single-peaked curve.Under 70% of shadG ing treatment,the diurnal variation of P n of P .semicordata presented a double-peak curve.Under full illumination of shadG ing,the mean Pn of diurnal variation and daily maximum of the two plants reached the maximum.Under 70% of shading, 40% of shading treatment,the peak of Pn of E.fortune var.minimus Rhed decreased by 57.80%、80.24%,the peak of Pn of P.semicordata decreased by 55.1%、76.86%.The transpiration rate decreased as the shading treatment is aggravating.Under 70% of shading,40% of shading treatment,the peak of transpiration rate of E.fortune var.minimus Rhed decreased by 46. 68%、55.60%,the peak of transpiration rate of P.semicordata decreased by 41.48%、74.00%.In different shading treatment, the mean water use efficiency of E.fortune var.minimus Rhed and P.semicordata were in order of full day light intensity >70% of shading > 40% of shading.This study suggested that E.fortune var.minimus Rhed and P.semicordata had the property of light demander,while it had the ability of shade tolerance in a certain degree and it is feasible for urban landscaping.

Euonymus fortune var.minimus RhedParthencissus semicordatashadenet photosynthetic rate,water use efficiency

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滨州市园林绿化管理处，山东 滨州 256603

小叶扶芳藤 三叶地锦 遮光 净光合速率 水分利用效率

2016

山东林业科技
山东省林科院 山东林学会

山东林业科技

影响因子：0.298
ISSN：1002-2724
年,卷(期)：2016.(6)
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