A CANOPY RADIATION MODEL FOR EVEN-AGED PLANTATION II. APPLICATION AND VALIDATION
人工同龄纯林冠层辐射场模拟模型 II.应用与验证

Measured radiation within the canopy of a Chinese fir plantation was used to validate an established canopy radiation model for even_aged plantations. Uncertainties and the impacts of leaf area density (LAD) distribution and scattered radiation were also calculated and analyzed with the model. Results show that there was no significant difference between measured and modeled instantaneous and daily radiation within canopy. Errors of simulations may result from irregular crown shape and crown size, grouped needles on shoots, etc. 2_D LAD distributions may improve the radiation simulation compared to averaged LAD. Simulated scattered radiation accounted for 3%-11% of total radiation, while low crown position and increased depth within the crown increased the relative proportion of scattered radiation.