短轮伐期巨桉人工林地上部分生物量和生产力研究

Studies on the Above-ground Biomass and Productivity of the Short Rotation Eucalyptus Grandis Plantation

研究了5年生巨桉人工林在不同处理水平条件下,地上部分各器官的生物量积累和分配及生产力;并运用回归分析研究了不同处理水平对林分生物量的影响以及利用方程W=a(D2H)b,W=a+bD+cD2,W=a+bD,W=aDb建立巨桉人工林林分地上部分与各器官生物量模型。结果表明各器官生物量分配顺序:树干>树皮>树枝>树叶;巨桉由于是速生树种,对肥水要求很高,在巨桉栽培时,除了适当的气候条件及合理的林分密度外,应选择立地条件良好的立地,同时加强林分肥水管理;所建模型R2值均大于临界值R20.01及r0.01可以运用于巨桉单株木生物量的生产估计。

The above-ground biomasses and productivity of the five-year old short rotation Eucalyptus grandis plantations were investigated under different managing levels and four regression models which include the parameter of biomass, diameter and height with equations W=a(D^2H)~b, W=a+bD+cD^2, W=a+bD, W=aD^b were built in this article. Results showed that the biomasses of single tree and its distribution of above-ground tissues were in the order of bole>bark>branch>leaf. The estimating precisions of four regression models which include the parameter of biomass, diameter and height are over critical minimum. So it can be used to forecast the biomasses of single tree. In the other hand, when Eucalyptus grandis was cultivated, not only suiting weather condition and reasonable density but also good sites condition was included as well as enhancing nutrients management was necessary.