10种重庆乡土植物幼苗耐旱性研究

盆栽条件下对黄荆、山毛豆、金发草、狼尾草等10种重庆乡土植物幼苗采取控水方式进行水分胁迫处理,同时设置施用保水剂处理.测定了土壤含水量、叶片水势、土壤水势、比叶面积、蒸腾速率、气孔导度这几个影响植物抗旱性的主要指标,采用隶属函数法进行综合评定.结果表明:施用保水剂能够有效缓解干旱胁迫对植物的伤害.6种灌木耐旱性由强到弱依次为:黄荆、车桑子、山毛豆、截叶胡枝子、多花木兰、猪屎豆;4种草本耐旱性由强到弱依次为:金发草、狼尾草、头花蓼、斑茅.

Study on Drought Resistance of the Seedlings of Ten Native Plants in Chongqing

In a pot experiment, ten native plants in Chongqing were exposed to simulated drought stress and treated with the water-retaining agent Aquasorb. The main influential indicators influencing drought tolerance of plants, i.e. soil water content, leaf water potential, soil water potential, specific leaf area, transpiration rate and stoma conductance, were determined, and the membership function method was employed to make a comprehensive assessment. The results showed that Aquasorb could effectively mitigate the injury under natural soil drought stress. Drought tolerance of the 6 bush plants was in the order of Vitex negundo L >Dodonaea viscosa (L. ) Jacq. > Tephrosia candida DC. >Leaspedeza cuneata > Indigofera arablyantha>Crotalaria pallida Alton; and that of the 4 herb species was in the order of Pogonatherum paniceum > Pennisetum alopecuroides (L.) Spreng > Polygonum capitatumHam ex D·Don> Erianthusarundinaceus (Retz.) Jesw.