尾巨桉和厚荚相思人工林细根主要营养元素贮存量及其季节动态研究

Storage Amount of Fine-Roots for Main Nutrients of Eucalyptus urophylla×E.grandis and Acacia crassicarpaPlantation and Their Seasonal Dynamics

通过对广西东门林场某分场5年生尾巨桉和厚荚相思人工林细根主要营养元素(N、P、K、Ca、Mg)贮存量及其季节动态进行的研究,结果表明:尾巨桉、厚荚相思人工林细根5种营养元素贮存量随季节不同而存在差异。不同季节尾巨桉人工林细根营养元素贮存量大小次序为夏季(6.514kg·hm-2)>秋季(6.452kg·hm-2)>春季(5.089kg·hm-2)>冬季(4.524kg·hm-2);厚荚相思人工林细根相应为夏季(13.920kg·hm-2)>秋季(11.523kg·hm-2)>春季(3.620kg·hm-2)>冬季(2.902kg·hm-2)。

Storage of main nutrients (N,P,K,Ca & Mg)of fine root of five-year-old Eucalyptus urophylla ×E . grandis and Acacia crassicarpa plantation in a certain sub-farm of Dongmen Forset Farm in Guangxi Zhuang Au-tonomous Region and its seasonal dynamics were studied.Result shows that there is difference on the storage a-mount of five main nutrient elements of the fine roots varied from seasons between Eucalyptus urophylla ×E . grandis and Acacia crassicarpa .The storage amount of the nutrient elements of the fine roots for Eucalyptus uro-phylla ×E .grandis varied from seasons ranks as summer (6.5 14 kg hm-2 )>autumn(6.452 kg hm-2 )>spring (5.089 kg hm-2 )>winter(4.524 kg hm-2 ),and that of Acacia crassicarpa ranks as summer(13.920 kg hm-2 )>autumn(1 1.523 kg hm-2 )>spring(3.620 kg hm-2 )>winter(2.902 kg hm-2 ).