鼎湖山格木群落的生物量和光能利用效率

Biomass and efficiency of radiation utilization in Erythrophleum fordii community

研究了鼎湖山南亚热带常绿阔叶林的生物量 ,发现其中格木 ( Erythrophleum fordii)群落的生物量为 568.1 72 t/hm2 ,叶面积指数为 2 7.80 2 5m2 /m2 ,均高于大面积分布的厚壳桂 ( Cryptocarya chinensis)群落。用红外线 CO2 气体分析法 ,分层测定了格木群落主要植物的光合速率和呼吸速率 ,计算了群落的生产力和光能利用率。结果表明 ,格木群落的总生产力为 2 4 970 k J/m2 · a,由总生产力计算其光合有效辐射能的吸收利用率为 1 7.0 5% ,净生产力的利用率为 4 .4 82 % ,都比厚壳桂群落高。测定格木群落的生产力和光能利用率 。

The biomass and leaf area index( LAT )studied in Erythrophleum fordii community in Dinghushan were 568.172t/hm 2 and 27.8025m 2/m 2 and they were higher compared with Cryptocarya chinensis community distributed widely in this region.CO 2 infra red analysis method was used to measure both photosynthesis rate and respiratory rate.The productivity and efficiency of radiation utilization were calculated.The results show that the gross primary productivity was 24970kJ/m 2 ·a,the utilization efficiency of available radiation for gross primary productivity and net primary productivity were 17.05% and 4.482% respectively.They were also higher than Cryptocarya chinensis community.The study of productivity and efficiency of radiation utilization is very significant in evaluating the productive potential of the forest community in the southern subtropical zone.