干旱区五种木本植物枝叶水分状况与其抗旱性能  

An analysis on the water status in twigs and its relations to the drought resistance in Five woody plants living in arid zone

作　　者：谭永芹[1] 柏新富[1] 朱建军[1] 王仲礼[1] 刘林德[1] 

机构地区：[1]鲁东大学生命科学学院,烟台264025

出　　处：《生态学报》2011年第22期6815-6823,共9页Acta Ecologica Sinica

基　　金：国家重点基础研究发展计划(2009CB421303)

摘　　要：用压力-容积(PV曲线)法测定了柽柳、梭梭、胡杨、沙枣和花棒等5种干旱区木本植物的水分参数,同时用TPS-1型光合蒸腾测定系统、压力室和露点微伏压计测定了其叶片(同化枝)的蒸腾速率、枝叶水势和渗透势,并结合持水力和枝叶相对含水量等的测定结果,分析了5种木本植物枝叶水分状况与其抗旱性能的关系。结果表明:PV曲线水分参数虽然在一定程度上反映了植物组织内部的水分状况和抗旱潜力,但依据不同参数分析得出的不同植物抗旱性有所不同,有的甚至相反;以PV曲线水分参数为依据利用隶属函数法计算的综合抗旱性指数显示5种木本植物抗旱性能并无显著差异。而综合PV曲线水分参数和蒸腾速率、枝叶水势、渗透势等实测水分指标计算的综合抗旱性能指数则较好地显示了5种木本植物的综合抗旱性能的强弱,即第1层次梭梭抗旱性最强,第2层次是柽柳,第3层次是沙枣、花棒和胡杨,其中又以胡杨综合抗旱能力最差。由此可见,采用PV曲线水分参数和实测水分指标进行综合评价能够较好地评定植物的抗旱性能。Water is the main environmental factor that affects plant growth and survival,and the eco-physiology of plants involving water has been an important aspect of research in plant drought resistance for a long time.The emergence of the PV technique allows researchers to investigate the water status of plant tissues in greater detail and to investigate the potential resistance of plants to drought resistance with new approaches.However,the application of the PV technique to the study of drought resistance in plants also brings about other problems such as the abuse of the method.Because the resistance of plants to drought stress is a process of regulated through multiple pathways,it is very hard to evaluate the drought resistance of plants with a single index or parameter.Thus the attempt to look for a eco-physiological index of water that is more accurate and more reasonable in evaluating the drought resistance of plants is a goal sought by researches for many years.In this experiment,the parameters of plant water status were measured by means of the PV curve,and the transpiration rate,leaf and/or twig water potential,and their osmotic potential were measured with a TPS-1 photosynthesis system,a pressure chamber and a dew point microvolt-meter in 5 woody plants（Populus euphratica Oliv.,Elaeagnus angustifolia L.,Tamarix ramosissima Ledeb.,Haloxylon ammodendron Bunge,Hedysarum scoparium Fisch.） living in arid zone,respectively.The water status in relation to their drought resistance in the 5 woody plants were analyzed in terms of ψsats（the osmotic potential in water saturated）,ψtlps（the osmotic potential when turgor pressure is zero）,RWCtlp（the relative water content when turgor pressure is zero）,ROWCtlp（the relative content of osmotic water when turgor pressure is zero）,Va（the content of bounding water）,transpiration rate,water potential,osmotic potential,water-retaining capability and relative water content.The results showed that although parameters from the PV curve could reflect the wate

关 键 词：干旱区 木本植物 PV曲线 水势 抗旱性 

分 类 号：S718.4[农业科学—林学]