Quantitative information about solar radiation in agroforestry system is relatively limited. The research by survey was conducted from October 2002 to February 2003 in Central of Java. The aim of the research was to s...Quantitative information about solar radiation in agroforestry system is relatively limited. The research by survey was conducted from October 2002 to February 2003 in Central of Java. The aim of the research was to study the amount of solar radiation below forest trees stand. The locations of the survey were chosen or determined based on the kinds of trees and forests. They were Purwodadi （teak, mahogany and sonokeling production forest）, Karanganyar and Purworejo （pines production forest） and Klaten （semolina and yucca as conservation forest）. The decrease in the relative＇s irradiation fraction （RIF） under the trees is related to the increase in the tree aging, adjusted to the exponential decrease model （RIF = 1.25e - 0.18X）. The RIF under tree canopy is clearly explained by diameter on the breast height diameter of trunk （DBH） divided by the half of tree row spacing （2D/（X ＋ Y））, so the RIF model is RIF = e - 0.2829 （2D/（X＋ Y））.展开更多
文摘Quantitative information about solar radiation in agroforestry system is relatively limited. The research by survey was conducted from October 2002 to February 2003 in Central of Java. The aim of the research was to study the amount of solar radiation below forest trees stand. The locations of the survey were chosen or determined based on the kinds of trees and forests. They were Purwodadi （teak, mahogany and sonokeling production forest）, Karanganyar and Purworejo （pines production forest） and Klaten （semolina and yucca as conservation forest）. The decrease in the relative＇s irradiation fraction （RIF） under the trees is related to the increase in the tree aging, adjusted to the exponential decrease model （RIF = 1.25e - 0.18X）. The RIF under tree canopy is clearly explained by diameter on the breast height diameter of trunk （DBH） divided by the half of tree row spacing （2D/（X ＋ Y））, so the RIF model is RIF = e - 0.2829 （2D/（X＋ Y））.
