Cavitation in trees

被引：139

作者：

Cochard, Herve ^{[1
]}

机构：

[1] INRA, UMR PIAF, F-63100 Clermont Ferrand, France

来源：

COMPTES RENDUS PHYSIQUE | 2006年 / 7卷 / 9-10期

关键词：

cavitation; embolism; tree; tension; drought; xylem;

D O I：

10.1016/j.crhy.2006.10.012

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Sap is transported under tension (i.e. negative pressure) in trees, according to the tension-cohesion theory. Since water is physically instable under negative pressure, a risk of cavitation is possible. Techniques have been developed during the past two decennia to study cavitation in trees. Trees appear remarkably immune to cavitation events. Cavities form only when extreme water stresses occur or when sap freezes. Nucleation is heterogeneous in trees, presumably caused by the aspiration of air bubbles through conduit walls. Threshold xylem pressures for cavitation vary greatly between species, in concordance with the great functional and ecological diversity of trees.

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收藏

页码：1018 / 1026

页数：9

相关论文

共 27 条

[1] SOIL-WATER DYNAMICS IN AN OAK STAND .1. SOIL-MOISTURE, WATER POTENTIALS AND WATER-UPTAKE BY ROOTS [J].

BREDA, N ;

GRANIER, A ;

BARATAUD, F ;

MOYNE, C .

PLANT AND SOIL, 1995, 172 (01) :17-27

[2]

BOHM T, 1893, J BER DTSCH BOT GES, V11, P203

[3] LIMITING NEGATIVE PRESSURE OF WATER [J].

BRIGGS, LJ .

JOURNAL OF APPLIED PHYSICS, 1950, 21 (07) :721-722

[4] Cryo-scanning electron microscopy observations of vessel content during transpiration in walnut petioles. Facts or artefacts? [J].

Canny, MJ ;

McCully, ME ;

Huang, CX .

PLANT PHYSIOLOGY AND BIOCHEMISTRY, 2001, 39 (7-8) :555-563

[5] Direct measurements of intervessel pit membrane hydraulic resistance in two angiosperm tree species [J].

Choat, Brendan ;

Brodie, Tyler W. ;

Cobb, Alexander R. ;

Zwieniecki, Maclei A. ;

Holbrook, N. Michele .

AMERICAN JOURNAL OF BOTANY, 2006, 93 (07) :993-1000

[6] Cryo-scanning electron microscopy observations of vessel content during transpiration in walnut petioles.: Facts or artifacts? [J].

Cochard, H ;

Bodet, C ;

Améglio, T ;

Cruiziat, P .

PLANT PHYSIOLOGY, 2000, 124 (03) :1191-1202

[7] XYLEM DYSFUNCTION IN QUERCUS - VESSEL SIZES, TYLOSES, CAVITATION AND SEASONAL-CHANGES IN EMBOLISM [J].

COCHARD, H ;

TYREE, MT .

TREE PHYSIOLOGY, 1990, 6 (04) :393-407

[8] Evaluation of a new centrifuge technique for rapid generation of xylem vulnerability curves [J].

Cochard, H ;

Damour, G ;

Bodet, C ;

Tharwat, I ;

Poirier, M ;

Améglio, T .

PHYSIOLOGIA PLANTARUM, 2005, 124 (04) :410-418

[9] USE OF POSITIVE PRESSURES TO ESTABLISH VULNERABILITY CURVES - FURTHER SUPPORT FOR THE AIR-SEEDING HYPOTHESIS AND IMPLICATIONS FOR PRESSURE-VOLUME ANALYSIS [J].

COCHARD, H ;

CRUIZIAT, P ;

TYREE, MT .

PLANT PHYSIOLOGY, 1992, 100 (01) :205-209

[10]

COCHARD H, IN PRESS PLANT PHYSL