Abstract
This investigation was carried out with the 28-year-old korean Pine plantation in Maoershan Area of Heilongjiang Province. The paper revealed the character of energy distribution in korean Pine plantation. The total solar radiations reaching the canopy were discussed respectively and the change pattern of radiation in the forest were analyzed in detail. The solar radiation received by canopy counts up to 2580. 64 MJ/m2 in growth season, of which. direct solar radiation is 1508. 52 MJ/m2 and scattered radiation 1072. 12 MJ/m2. The radiation energy reaching the forest land surface through the canopy is 277. 25MJ/m2, with a transmissivity of about 10. 74%. The net production formed by photosynthesis of forest is 16. 89 MJ/m2 and the net radiation reception by the ecosystem comes to 1091.88 MJ/m2 during growth seasons, therefore the utilization efficiency of solar radiation energy derived from the net radiation taken as basis is 1.55% in the korean pine plantation.
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