Department of Botany, The University, G12 8QQ, Glasgow, UK.
Planta. 1985 Jan;163(1):27-33. doi: 10.1007/BF00395893.
The acoustic technique was used in conjunction with the pressure chamber to determine the tensions causing cavitation of xylem sap in leaves of five woody angiosperms (Acer pseudoplatanus L., Alnus glutinosa L. Gaertn., Eucalyptus globulus Labill., Fraxinus excelsior L. and Rhododendron ponticum L.) and three species of herbs (Lycopersicum esculentum Mill., Plantago major L. and Ricinus communis L.). The results showed leaves of most species to suffer considerably from cavitation at sap tensions of 1.6-3 MPa. Two of the herbs, Lycopersicum and Ricinus, cavitated extensively at sap tensions below 1 MPa. Additional evidence is presented that clicks, detected by acoustic amplification, are caused by cavitation of sap in the xylem conduits. A rapid method is suggested for the determination of sap tensions in cavitating leaves and which is suitable for surveys of the critical sap tension in a large number of species.
声技术与压力室结合使用，以确定木质部汁液在五种木本被子植物（欧洲白蜡树、桤木、蓝桉、欧洲白蜡树和杜鹃花）和三种草本植物（番茄、车前草和蓖麻）叶片中产生空化的张力。结果表明，大多数物种的叶片在汁液张力为 1.6-3 MPa 时会受到严重的空化影响。两种草本植物，番茄和蓖麻，在汁液张力低于 1 MPa 时会广泛空化。另有证据表明，通过声学放大检测到的咔嗒声是木质部导管中汁液空化引起的。提出了一种快速测定空化叶片汁液张力的方法，该方法适用于大量物种临界汁液张力的调查。
