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 hems-leyana,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。
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 g·g-1·h-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.
出处
《浙江农林大学学报》
CAS
CSCD
北大核心
2013年第4期499-504,共6页
Journal of Zhejiang A&F University
基金
杭州市西湖风景名胜区管委会科技项目(2009-005)
关键词
植物学
干旱胁迫
地被植物
耗水特性
最大光化学效率
botany
drought stress
ground cover plants
water consumption
maximal photochemical efficiency
