深圳福田无瓣海桑-海桑林能量的研究

Energy situation of Sonneratia apetala-S. caseloris forest in Futian of Shenzhen.

在研究生物量、生产力的基础上 ,对深圳福田无瓣海桑 海桑林中 2种红树植物海桑和无瓣海桑各组分的干重热值、林分能量现存量、年能量净固定量进行了研究 .结果表明 ,各组分样品干重热值有一定的差异 ,树叶干重热值最高 ,细根干重热值最低 ;海桑各组分样品干重热值比无瓣海桑相应组分稍高 .林分能量现存量 (1999年 10月 )为 84774.72kJ·m-2 ,其中无瓣海桑种群能量现存量为 5 4693 .2 6kJ·m-2 ,占林分总量的 64 .5 4% ,海桑种群能量现存量为 3 0 0 5 1.46kJ·m-2 ,占林分总量的 3 5 .46% .林分凋落物的能量归还量 (1999年 )为 2 45 49.5 4kJ·m-2 ·年 -1,其中无瓣海桑种群的能量归还量为 172 2 3 .99kJ·m-2 ·年-1,占总林分的 70 .16% ,海桑种群的能量归还量为 73 2 5 .5 5kJ·m-2 ·年 -1,占总林分的 2 9.84% .林分能量净固定量为 5 0 3 91.4kJ·m-2 ·年 -1,其中无瓣海桑种群和海桑种群的能量净固定量为分别为 3 1778kJ·m-2 ·年 -1和 18613 .4kJ·m-2 ·年 -1.

Based on the measurement of biomass and productivity, the caloric value of different fractions of two species in S.apetala S.caseloris forest, and their standing crop of energy and net energy production were determined. There were some differences in caloric values among the fractions of S. apetala and S. caseloris , and the caloric value of leaf was the highest,while that of the fine roots was the lowest. The caloric values of various fractions of S.apetala were much higher than those of S.caseloris .The standing crop of energy in S.apetala S.caseloris forest was 84 744.72 kJ·m -2 . The standing crop of energy accumulated in S. apetala population was 54 693.26 kJ·m -2 , accounting for 64.54 % of the total, and that of S.caseloris population was 30 051.46 kJ·m -2 , accounting for 35.46%. The energy return value of litters was 24 549.54 kJ·m -2 ·yr -1 ,that of S.apetala population was 17 233.99 kJ·m -2 ·yr -1 (accounting for 70.16%), and that of S.caseloris population was 7 325.55 kJ·m -2 ·yr -1 (29.84%).The net energy production was 50 391.4 kJ·m -2 ·yr -1 for S. apetala S. caseloris forest in 1999, in which the net energy production of S. apetala population was 31 778 kJ·m -2 ·yr -1 .