鼎湖山森林植被主要优势种黄果厚壳桂、厚壳桂生物量及第一性生产力研究

 本文研究鼎湖山森林植被主要优势种黄果厚壳桂和厚壳桂的生物量和第一性生产力。通过野外样地调查，测定2000m2样地中2个种的数量、每木高度和胸高半径，同时砍伐样木，测定2个种各部分的比例，确定它们的相对生长式，进而测定种的各部分的生物量及群落中2个种的生物量；利用红外线CO2分析仪，对2个种三年来的光合速率进行测定，进而估算2个种的光合量和第一性生产力。 本文研究结果表明，黄果厚壳桂和厚壳桂在厚壳桂群落中的生物量干重分别为：39.053t·ha-1和24.092t·ha-1(鲜重分别为68.208t·ha-1和43.733t·ha-1)；净第一性生产力分别为2.384t·ha-1·a-1和1.13t·ha-1·a-1。文章对研究结果作进一步的讨论，以揭示2个种在群落中的作用和地位。

STUDIES ON BIOMASS AND PRIMARY PRODUCTIVITY OF TWO DOMINANCE SPECIES, CRVPTOCARYA CONCINNA AND C. CHINENSIS, OF FOREST VEGETATION ON DINGHUSHAN

In this paper, the biomass and net primary productivity of two dominance species, Cryptocarya concinna and C. chinensis, of forest vegetation on Dinghushan Mountain are studied. After surveying quadrat samples, the total numbers of the two species and the height and base area of every tree are measured. According to the data on harvested trees, the growth relation formulas of the varied parts of a plant are built, and then the biomass of the two populations are calculated. The photosynthetic rates and respiration rates of the two populations are also measured, and their photosynthetic values and respiration values as well as their net primary productivity are calculated.The results show that the biomass of Cryptocarya concinna is 68.208 t· ha-1 (fresh weight) or 39.053 t· ha-1 (dry weight); the biomass of C. chinensis, 43.733 t· ha-1 (fresh weight) or 24,092 t· ha-1 (dry weight). The net primary productivities of Cryptocarya concinna and C. chinensis are 2.384 t·ha-1·a-1 and 1.193 t·ha-1·a-1. According to the biomass and net primary productivitys of the two populations, the populations of Cryptocarya concinna and C. chinensis hold an importnat position and play an important role in the community.