茂名小良桉树营养元素的测定-广东林业科技.doc

茂名小良桉树营养元素含量的测定 郭先霞 刘华*2 王志敏3 詹宜东1 郑森华1 （1.广东石油化工学院 化学与生命科学学院, 广东 茂名 525000；2. 湛江师范学院物理科学与技术学院；3. 广东石油化工学院 理学院） 摘要：为研究茂名小良水保站桉树的化学成分，测定了小良5种桉树的8种营养元素的含量，其中K、Ca、Mg、Cu、Fe、Mn、Zn火焰原子吸收光谱法Cu含量最低；4种大量元素P、K、Ca、Mg含量都表现为叶最大，枝次之，根和干中的含量较小；而4种微量元素Cu、Fe、Mn、Znutrient Element Content of Eucalyptus in Xiaoliang,Maoming,Guangdong Guo Xianxia1 Liu Hua﹡2Wang Zhimin3 Zhan Yidong1 Zheng Senhua1 (1.College of Chemistry and Life Science,Guangdong University of Petrochemical Technology,Maoming 525000; 2.Physics Science( Technology School,Zhanjiang Normal University; 3.College of Science,Guangdong University of Petrochemical Technology) Abstract: To study the chemical composition of eucalyptus from Xiaoliang station of water and soil conservation,Maoming. 8 nutrient elements from 5 eucalyptus were determined, among which, K,Ca,Mg,Cu,Fe,Mn and Zn were determined by flame atomic absorption spectrometry, P by ammonium molybdate spectrometry. The results showed that the contents of four macronutrients including P,K,Ca and Mg present KCaMgP in the same organs of the same species. Among the four micronutrients, the content of Mn is the highest and Cu is the lowest. Contents of the four macroelements are the highest in leaves, secondary in branches, the lowest in trunk and root. However, contents of the four microelements present no consistent law in different organs in the same species. The law between contents of nutrient elements from different eucalyptus is not consistent with each other generally. Key words: Xiaoliang, Maoming, eucalyptus, nutrient element 桉树自1890年引入中国，在中国栽培已有多年历史，由于桉树具有速生、高产和良好的适应性，在我国热带、南亚热带广泛种植，现已成为我国南方重要的速生丰产林树种。中国现有桉树人工林总面积达到1.6×106 hm2 [1]。广东省茂名市小良水土保持试验推广站(简称小良水保站)是联合国“人与生物圈”考察点和“中国科学院水土保持实验推广站”所在地，全站面积为433.33 hm2，目前桉树栽培面积已占全站总面积的70%以上，在五年内可能达到90%以上[2]。然而，目前国内外对小良水保站桉树的研究多集中在生态经济、生态环境等方面[2-9]，对其营养成分的研究少见报道。本研究主要采用原子吸收光谱法K、Ca、Mg、Cu、Fe、Mn、Zn均属于大叶桉（Eucalyptus robusta）、3年生5号桉、3年生5号桉（二次生长)（为第二代萌芽林）、窿缘桉（Eucalyptus exserta）、马尾松（Pinus massoniana）和铁芒萁（Dicranopteris linearis