摘要
通过测定广东鹤山一个马占相思 (Acaciamangium)人工林的辐射能环境 ,优势种的净光合速率、呼吸速率和生产力 ,群落的生物量及热值 ,定量地刻划了太阳辐射能被马占相思种群吸收、固定、转化、损耗、积累和分配的生物能量学过程。全年抵达林冠上层的总太阳辐射能为 4 351 4MJ·m- 2 ·a- 1 ,能量积累量为 14 8MJ·m- 2 ·a- 1 ,折合光能利用效率为0 34%。群落的能量现存量为 193 9MJ·m- 2 。稳定性分析表明该马占相思人工林群落具有抵抗干扰和保持系统平衡态的自我调节能力 ,确保能量在系统内作正常活动 ,但该群落能流的现状为输入大于输出 ,群落仍在积累能量 ,群落尚未达到真正的平衡。要提高该人工林的光能利用效率 ,关键在于保持或调整群落的结构。
The radiation energy environment,photosynthesis and respiration rate,productivity,biomass and caloric value were measured in a Acacia mangium plantation at Heshan,China.The data was converted into the standing crop energy and the process of energy flow.The standing crop energy of the plantation was 193 9 MJ·m -2 .In the process of the energy flow,the energy input was \{4 351 4 \} MJ·m -2 ·a -1 ,the energy accumulation only was 14 8 MJ·m -2 ·a -1 ,which mean most of the energy was lost in the process of the energy flow.The stability analysis showed that the stability mechanism of the equilibrium state was the negative feedback mechanism.It is necessary to improve the community structure for increasing the productivity the plantation.
出处
《生态科学》
CSCD
2000年第2期1-6,共6页
Ecological Science
基金
中国生态系统研究网络课题资助项目!(KZ95T 0 4 0 2 0 5)
国家自然科学基金重大项目资助项目!(39899370 )
中国科学院重大项目资
关键词
能量现存量
能量流动
马占相思
人工林
the standing crop energy
energy flow
Acacia mangium plantation
