A METHOD FOR INDUCING XYLEM EMBOLI INSITU - EXPERIMENTS WITH A FIELD-GROWN TREE

被引：76

作者：

SALLEO, S ^{[1
]}

HINCKLEY, TM ^{[1
]}

KIKUTA, SB ^{[1
]}

LOGULLO, MA ^{[1
]}

WEILGONY, P ^{[1
]}

YOON, TM ^{[1
]}

RICHTER, H ^{[1
]}

机构：

[1] AGR UNIV VIENNA,INST BOT,GREGOR MENDEL STR 33,A-1180 VIENNA,AUSTRIA

来源：

PLANT CELL AND ENVIRONMENT | 1992年 / 15卷 / 04期

关键词：

SALIX-VIMINALIS; SALICACEAE; BASKET WILLOW; AIR SEEDING; CAVITATION; HYDRAULIC CONDUCTIVITY; PRESSURE COLLAR; ULTRASOUND ACOUSTIC EMISSIONS (UAES); XYLEM EMBOLI;

D O I：

10.1111/j.1365-3040.1992.tb01001.x

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

A pressure collar, assembled around 25 cm sections of 4-year-old willow twigs, was used to examine cavitation events under field conditions. When the air pressure inside the collar was raised to between 1.8 and 2.8MPa, ultrasound acoustic emission signals were triggered which indicated the breaking of water columns in the xylem. The hydraulic conductivity of the twig portion inside the chamber decreased markedly. As a result, water potentials and conductances in leaves at the end of the twig decreased. Similar changes were induced at comparable pressures in detached twigs. The equipment used is described in detail, and evidence is presented that the mechanism of this artificial production of emboli follows the air-seeding principle hypothesized for natural cavitation events.

引用

页码：491 / 497

页数：7

共 13 条

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