在生物量和生产力研究的基础上,对长汀河田严重退化土地上恢复的马尾松-灌木群落的能量格局进行了研究,结果表明:乔灌木混交林乔木层地上部分各器官干重热值均大于相应对照的,而地下部分的则低于相应对照的,群落各层次的干重热值大小为乔木层>灌木层>草本层>苔藓层。乔灌木混交林群落的能量现存量达258900.8kJ·m-2,是对照群落的156.1倍。对照的群落仅由乔木层和草本层组成,植被盖度极低,光能转化效率很小,群落内昼夜温差大、土壤干旱,生态系统严重退化。乔灌木混交林群落能量年存留量、年归还量、年净固定量分别达27092.03、5825.01和32917.04kJ·m-2a-1,分别是对照的59.6、128.7和65.9倍;其群落的太阳能转化率为1.55% ,说明治理后群落的能量生产能力已基本得到恢复。
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.
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