尾巨桉和厚荚相思人工林细根生物量的研究

Biomass Dynamics of Fine Roots for Eucalyptus urophylla×E.grandis and Acacia crassicarpaPlantations

通过对广西黄冕林场6年生尾巨桉和厚荚相思人工林细根的生物量含量进行研究,结果表明:尾巨桉和厚荚相思人工林细根在春、夏、秋、冬4个季节的生物量分别为0.576、0.765、0.624、0.391thm-2和0.416、1.482、1.256、0.288t hm-2,年平均分别为0.589和0.861thm-2,两树种细根生物量的季节变化基本一致,均为夏季>秋季>春季>冬季,但厚荚相思的季节变化幅度明显大于尾巨桉。

The biomass of the fine roots for six-year-old Eucalyptus urophylla ×E .Grandis and Acacia crassicarpa plantations in Guangxi State-Owned Huangmian Forest Farm were studied.Result shows that he biomass of the fine roots for Eucalyptus urophylla ×E .grandis and Acacia crassicarpa in spring,summer,autumn & winter is 0.576, 0.765,0.624,0.391 t hm- 2 and 0.41 6,1.482,1.256,0.288 t hm- 2 respectively;their annual biomasses of the fine roots are 0.589,0.861 t hm- 2 respectively.The seasonal variation of biomass of fine roots for the two species is unanimous,their descending order all are summer>autumn>spring>winter,but the variation of biomass for A-cacia crassicarpa at different seasons is more obvious than that of Eucalyptus urophylla ×E .grandis .