Light and temperature effects on whole-canopy net carbon dioxide exchange rates of apple trees

被引：15

作者：

Francesconi, AHD ^{[1
]}

Lakso, AN ^{[1
]}

Denning, SS ^{[1
]}

机构：

[1] Cornell Univ, New York State Agr Expt Stn, Dept Hort Sci, Geneva, NY 14456 USA

来源：

INTERNATIONAL SYMPOSIUM ON INTEGRATING CANOPY, ROOTSTOCKS AND ENVIRONMENTAL PHYSIOLOGY IN ORCHARD SYSTEMS, PROCEEDINGS - VOLS 1 AND 2 | 1997年 / 451期

关键词：

photosynthesis; Malus domestica; temperature; light;

D O I：

10.17660/ActaHortic.1997.451.33

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Effects of previous days' light conditions, hours of exposure to sunlight, time of the day, temperature and/or vapor pressure deficit (VPD) on whole-canopy net CO2 exchange rate (NCER) of cropping field-grown 'Empire' or potted 'Gala' apple (Malus domestica Borkh.)/M.9 trees were studied. In most studies, simultaneous single-leaf NCER measurements were also taken. Artificial shading to 24% full sun for two previous days or to 23% full sun until mid-morning did not affect the subsequent whole-canopy and single-leaf NCER diurnal pattern of 'Empire' trees. Light response curves of 'Empire' trees showed higher dark respiration rate (16 vs. 7% of the maximum NCER) and higher light compensation point (84 vs. 32 mu mol.m(-2).s(-1)) for whole-canopy than for single leaves. Whole-canopy NCER of 'Gala' trees was negatively related to increases in air temperature from 15 to 34 degrees C and/or VPD from 7 to 30 g.m(-3). Whole-canopy and single-leaf NCER of 'Empire' and 'Gala' trees decreased throughout the day in most cases. Possible mechanisms for the observed patterns and suggestions on measuring whole-canopy NCER are discussed.

引用

页码：287 / 294

页数：8