Abstract:

Based on the measurement of biomass and productivity, the caloric value of plant samples, the standing crop of energy, net energy production and energy conversing efficiency of mixed forest composed of P.massoniana and shrubs were determined. The caloric values in the mixed forest were in the order of trees>shrubs>herbs>mosses. The standing crop of energy in the mixed forest was up to 258900.8kJ·m^-2, being 156.1 times higher than that in the control (wasteland). Just being composed of trees and herbs, the plant community on control wasteland has a poor radiation capture efficiency and caused big difference in temperature between day and night, and soil draught in a long period, which are harmful to ecological recovery. The yearly retention, return and net production of energy in the mixed forest amounted to 27092.03, 5825.01and 32917.04kJ.m^-2a^-1, respectively, and were 59.6, 128.7 and 65.9 times higher than that on wasteland, separately. To the photosynthetic active radiation on the stand, the energy conversing on efficiency was 1.55%. It was concludedd that the energy productivity in the mixed stand was recovered to some extent.

Key words: P. massoniana and shrubs mixed forest, Energy, Eroded degradation red soil