鼎湖山亚热带季风常绿阔叶林的生物量和光能利用效率

BIOMASS AND EFFICIENCY OF RADIATION UTILIZATION IN MONSOON EVERGREEN BROADLEAVED FOREST IN DINGHUSHAN BIOSPHERE RESERVE

报道鼎湖山自然保护区黄果厚壳桂群落的生物量、生产力和光能利用效率。根据群落的种类成分和结构特征，分层选主要树种，用样本收获法和红外线ＣＯ２气体分析法，测定了群落的生物量、光合速率和呼吸速率，计算了群落的生产力和光能利用效率．结果表明，群落的生物量为２０８ｔ·ｈｍ－２；总生产力为１２８７０４ｋＪ·ｍ－３·ａ－１，净生产力为３０４５１ｋＪ·ｍ－２·ａ－１；由总生产力计算光合有效辐射能的吸收利用率为９，６６％，净生产力的利用率为２．２８６％，并与厚壳桂群落作比较，阐明了南亚热带森林群落的生产潜力．

The biomass, productivity and efficiency of radiation utilization in Cryptocarya concinna community in Dinghushan Biosphere Reserve were investigated.The biomass, photosynthetic rate and respiration rate were measured by harvesting the sample plants of the main species in serveral layers and by CO2 infra-red analysis. After ward,the productivity and the efficiency of radiation utilization were calculated. The results show that the biomass, gross primary productivity and net primary productivity in the community were 208 t· hm-2, 128704 kJ· m-2. a-1 and 30451 kJ· m-2. a-1, respectively, the utilization efficiency of available radiation for gross primary productivity and net primary productivity were 9. 66% and 2. 29%, respectively. These results explain the potential productivity of the forest community in southern subtropical zone.