摘要
对不同生育期的油桐林生物量和大量营养元素(N、P、K、Ca、Mg)的生物循环进行了研究。结果表明,桐林的生物量随树龄的增大逐渐积累,从幼龄期开始到20年生的桐林,其生物量的积累值为79,61t/ha。桐林不同生育期的光合产物在各器官中的分配比例不同。经济产量(果生物量或种仁生物量)随树龄的动态变化服从二次抛物线函数:W_(FR)=-2.11398+0.82471(t-1)-0.03540(t-1)~2W_S=-1.37257+0.38539t-0.01706t^2不同生育期,桐林中大量营养元素的吸收量、存留量、归还量和输出量均不同。
The study of the biomass and nutrient elements N, P, K, Ca and Mg in tung's (Vernicia Fordii) various growth periods indicated an accumulation of biomass in the trees while they were growing. In a 20 -year-old stand the accumulated quantity was found to be 79.61 t/ha. The distribution of the photosynthate in the tree's various organs differed from one growing phase to another.The economic output (fruit biomass or kernel biomass) to the dynamic tree age could be calculated through
Also the amount of the nutrient elements in terms of absorption, reserve, return and output varied with the growth periods.
出处
《经济林研究》
1990年第2期6-20,共15页
Non-wood Forest Research
关键词
油桐
生物量
养分生物循环
Vernicia fordii
Biomass
Economic coefficient
Nutrient cycle
