期刊
SILVA FENNICA
卷 45, 期 4, 页码 595-609出版社
FINNISH SOC FOREST SCIENCE-NATURAL RESOURCES INST FINLAND
DOI: 10.14214/sf.95
关键词
light; nitrogen; Picea mariana; Pinus banksiana; photosynthesis; thinning
类别
资金
- Canadian Natural Sciences and Engineering Research Council [CFSPJ 256356-01]
- NSERC-UQAT-UQAM Industrial Chair in Sustainable Forest Management
- Scierie Landrienne Inc.
- Domtar Inc.
- Tembec Inc.
- Abitibi-Consolidated Inc.
A decrease in the average diameter of commercially harvested tree species in the Eastern boreal forest of Canada has led to a decrease in availability of quality wood for the forest industry. Commercial thinning has been proposed as a means to increase stem diameter growth. However, little is known about physiological responses underlying species responses to thinning. We assessed the effect of canopy opening on the photosynthetic response of mature jack pine (Pious banksiana Lamb.) and black spruce (Picea mariana (Mill.) BSP) trees. Two years after thinning and for each species, light response curves and the diurnal course of photosynthesis were characterized from measurements taken in a completely randomized block experiment on current-year and one-year-old needles of 12 trees from stands subjected to different levels of canopy opening. Soil water content, air and soil temperatures, and needle N concentration were not affected by thinning for either species. However, light availability increased with basal area removed and could explain the significantly positive relationship between thinning intensity and diurnal course of photosynthesis for one-year-old needles of jack pine. Black spruce photosynthesis did not respond to increases in light. Light-saturated rate of net photo synthesis (A(max)), photosynthetic efficiency (a), light compensation point (LCP), and diurnal respiration (R-d) did not vary with thinning for either of the species. Jack pine and black spruce responses to thinning should be interpreted in light of species autecology.
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