Water consumption and maximal photochemical efficiency for shade tolerant，ground cover plants during drought stress
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摘要: 为筛选出节水耐旱型的优良林下地被植物，试验选取了赤车Pellionia radicans，点腺过路黄Lysimachia hemsleyana，伏地卷柏Selaginella nipponica，翠云草Selaginella uncinata，江南卷柏Selaginella moellendorfii，轮叶景天Sedum chauveaudii，沿阶草Ophiopogon bodinieri和江南景天Sedum kiangnanense等8种阴生型地被植物，分析了干旱胁迫对其耗水和最大光化学效率（Fv/Fm）的影响。采用连续干旱的方法，测定不同干旱胁迫下各植物的日耗水规律；采用人为控制土壤相对含水量的方法，利用Li-6400XT便携式光合仪测定不同干旱胁迫对各植物Fv/Fm的影响。结果表明：各植物的日耗水变化均呈单峰型，峰值都出现在10:00-14:00，各植物高峰时期每小时的耗水量和白天的耗水总量差异显著；随着干旱胁迫的加剧，耗水量不断下降，而且峰值越来越不明显，各种类之间的差异不显著；江南卷柏、翠云草和伏地卷柏的Fv/Fm在不同的干旱胁迫下出现显著的下降，形态特征变化明显。8种阴生型地被植物均为较理想的节水耐旱型林下地被植物，其中沿阶草最优，而伏地卷柏、翠云草和江南卷柏的耐旱能力稍差；此8种阴生型地被在栽培和养护过程中满足其高峰时段的耗水需求，即可以达到生长和景观的需求，在园林中进行合理地配置和应用。图3参21Abstract: To select drought-resistant and water-saving plants，water consumption and maximum photochemical efficiency（Fv/Fm）of eight shade tolerant，ground cover plants（Pellionia radicans，Lysimachia hemsleyana， Selaginella nipponica，Selaginella uncinata，Selaginella moellendorffii，Sedum chauveaudii，Ophiopogon bodinieri） experiencing drought stress were analyzed. The persistent drought method was used to find diurnal water consumption regularity，and Fv/Fm was determined with manual control of different relative water contents using an Li-6400XT（Split-plot design with treatments of 100%，80%，60%，40% and 3 replications）. Results showed that with normal water content levels（100%），the diurnal variation for water consumption was a single-peak type between 10:00 and 14:00 with the peak and total water consumption varying among the eight plants（F=8.459，P=0.05）. As water stress increased，water consumption decreased until there was no difference which were all under 0.5 gg-1h-1. The Fv/Fm of Selaginella moellendorffii，Selaginella uncinata，and Selaginella nipponica decreased dramatically at 80%，60%，40% by 61.6%，22.6%，48.5% respectively，and morphological characteristics deteriorated. Of the eight plant types，Ophiopogon bodinieri had the most ideal characteristics；whereas S. moellendorffii，S. uncinata，and S. nipponica were less fit as drought-resistant and water-saving types. Nevertheless，as long as peak water consumption was maintained， these plants could be used in gardens. ［Ch，3 fig. 21 ref.］
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Key words:
- botany /
- drought stress /
- ground cover plants /
- water consumption /
- maximal photochemical efficiency
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链接本文:
https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2013.04.006
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