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Photosynthesis in Seedlings of Six Conifer Species under Natural Environmental Conditions
Author(s) -
Hodges John D.,
Scott David R.
Publication year - 1968
Publication title -
ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.144
H-Index - 294
eISSN - 1939-9170
pISSN - 0012-9658
DOI - 10.2307/1936548
Subject(s) - photosynthesis , scots pine , biology , botany , ecology , environmental science , pinus <genus>
Highest average daily rates of net photosynthesis in hemlock, grand fir, Sitka spruce, and Douglas—fir occurred at the outer margin of a forest stand. For Scots pine and noble fir highest rates occurred in an open, fully exposed area. The environment at the stand border apparently resulted in more favorable internal water relations. Species which assimilated best under exposed conditions apparently were better able to control moisture loss than were the other species. Species differed in photosynthetic efficiency. Shade—grown seedlings apparently are capable of higher rates of net photosynthesis than sun—grown plants of the same species.