Soil temperature limitations on gas exchange in 1‐year‐oldPinus sylvestris(L) seedlings
作者:
Jukka Lippu,
Pasi Puttonen,
期刊:
Scandinavian Journal of Forest Research
(Taylor Available online 1991)
卷期:
Volume 6,
issue 1-4
页码: 73-78
ISSN:0282-7581
年代: 1991
DOI:10.1080/02827589109382650
出版商: Taylor & Francis Group
关键词: Pinus sylvestris;gas exchange;soil temperature
数据来源: Taylor
摘要:
Effects of soil temperature on gas exchange of Scots pine seedlings were studied to evaluate the significance of reduced gas exchange in seedlings planted in cold soils. The patterns of net photosynthesis during the 3‐week period at the two constant soil temperatures (8°C and 12°C) were quite similar but at 12°C the photosynthetic rate was higher. After U days differences were no more significant. Photosynthesis at the increasing soil temperature, from 5.5°C to 13°C, decreased for the first 18 days and then recovered up to the level of other treatments. The same patterns were found for transpiration, stomatal conductance, and photosynthetic efficiency. Xylem pressure potentials and relative resistance to water flow after 3 weeks did not differ among soil temperatures. Initiation and development of current‐year needles affected all the results of gas exchange parameters.
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