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| 基于PEG胁迫的美丽异木棉等园林景观树种抗旱性评 |
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陈水钦1,2, 叶龙华3, 莫云豹3, 陈新宇4, 张卫华4, 潘文4, 朱报著4
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1. 广东省森林培育与保护利用重点实验室 / 广东省林业科学研究院,广东 广州 510520;2. 仲恺农业工程学院 农业与生物学院,广东 广州 510225;3.广东省林业科技推广总站,广东 广州 510173;4.广东省森林培育与保护利用重点实验室 / 广东省林业科学研究院,广东 广州 510520
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| 摘要: |
| 为探究水分胁迫对南方常用园林景观树种生理特性的影响，文章以美丽异木棉Ceiba speciosa等27 种南方常用园林树种为材料，采用PEG 水分胁迫模拟干旱处理，设置轻度、中度、重度3 种胁迫方式，测定其相对电导率、相对含水量以及相对水分亏缺生理指标，进行抗旱性评价。结果表明，随着干旱胁迫程度的增加，27 个树种叶片相对电导率值呈增加趋势；在轻度胁迫下，不同处理时间间无显著差异，而27 个树种间差异达到极显著（P< 0.01）；中度胁迫下，27 个树种间差异达到极显著（P<0.01），不同处理时间间达到显著（P< 0.05）；当胁迫程度达到重度时，树种间和不同处理间均达到极显著差异（P< 0.01）。选取相对含水量和相对水分亏缺指标，采用模糊隶属函数值法综合评价了27 个树种的抗旱性。在园林植物耐旱、节水配置中可以优选穗花棋盘脚Barringtonia racemosa、蓝花楹Jacaranda
mimosifolia、黄槐Cassia surattensis、红花荷Rhodoleia championii、蓝花风铃木Tabebuia impetiginosa、杜鹃红山茶Camellia azalea、深山含笑Michelia maudiae、本地木棉Bombax malabaricum、美花红千层Callistemon citrinus、澳洲火焰木Brachychiton acerifolius 等树种。 |
| 关键词: 园林景观树种 生理特性 抗旱性 |
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| 基金项目:广东省科技计划项目（2016A020206011） |
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| Drought Resistance Evaluation of Ceiba speciosa and Other Landscape Tree Species Based on PEG Stress |
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CHEN Shuiqin1,2, YE Longhua3, MO Yunbao3, CHEN Xinyu4, ZHANG Weihua4, PAN Wen4, ZHU Baozhu3
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1.Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization/Guangdong Academy of Forestry, Guangzhou, Guangdong 510520, China;2. College of Agriculture and Biology,Zhongkai University of Agriculture and Engineering, Guangzhou, Guangdong 510225, China;3.Guangdong Provincial Forestry Technology Extension Station, Guangzhou, Guangdong 510173, China;4.Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization/Guangdong Academy of Forestry, Guangzhou, Guangdong 510520, China
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| Abstract: |
| In order to explore the effect of water stress on physiological characteristics of landscape tree species in South China, drought resistance was evaluated. Twenty seven landscape tree species in South China, such as Ceiba speciosa, were used to simulate drought treatment under PEG water stress. Three stress modes, namely mild, moderate and severe, were set up to measure the relative electrical conductivity, relative water content and relative water deficit physiological indexes. The results showed that the relative electrical conductivity of 27 tree species increased with the increase of stress degree. Under mild stress, there was no signi?cant difference among different treatment time, but the difference among 27 tree species reached extremely signi?cant. Under moderate stress, the difference between 27 tree species reached extremely signi?cant (P< 0.01), and reached signi?cant between different treatment time (P< 0.05). When the stress degree reached severe stress, the difference was significant. There were significant differences among tree species and different treatments. According to the relative water content and relative water de?cit, the drought resistance of 27 tree species was comprehensively evaluated by fuzzy membership function value method. In the drought resistant and water-saving configuration of garden plants, we can select some tree species, such as Barringtonia racemosa、Jacaranda mimosifolia、Cassia surattensis、Rhodoleia championii、Tabebuia impetiginosa、Camellia azalea、Michelia maudiae、Bombax malabaricum、Callistemon citrinus and Brachychiton acerifolius. |
| Key words: landscape tree species physiological characteristics drought resistance |
