Competition of the light，fertilizer and water between Choerospondias axillaris trees and peanut in the red soil of low hilly land-Ⅱ．Analysis of using light energy of Choerospondias axillaris trees and peanut

Agroforestry between Choerospondias axrillaris trees and peanut affects the photosynthetic active radiation(PAR)of peanut in the red soil of low hilly land and the yield and biomass of peanut are obviously reduced owing to the influence of Choerospondias axrillaris trees．Compared with single culture of peanut，the relative PAR variation of intercropping peanut by row mainly relates to the distance from tree line and that is in keeping with the trend of spatial variability on yield and biomass of peanut Both yield and biomass of peanut have a significant correlation to relative PAR．