摘要
为了研究南极不同苔藓植株及其器官间的元素组成和分布的差异 ,我们利用同步辐射X射线荧光对菲尔德斯半岛 3种金发藓植株进行了重元素分析。这 3种植物是高山金发藓(Polytrichumalpinum) ,桧叶金发藓 (P .juniperinum)和极地金发藓 (P .alpestre)。它们所含的元素种类大致相同 ,主要有K、Ca、Mn、Fe、Cu、Zn和Sr等 ,这说明在菲尔德斯半岛 3种金发藓植株的生境条件是相似的。但是 ,在Polytrichumalpinum叶内 ,K峰远大于Ca ,Ca峰大于Fe ;在P .juniperinum植物叶片中 ,K峰大于Ca ,而Ca峰接近于Fe ;在P .alpestre叶内 ,K、Ca和Fe峰几乎相等。通过对P .alpestre不同部位进行X荧光分析 ,并用荧光计数法表示元素相对含量 ,我们发现各部位间的元素含量差异很大。在顶芽处 ,K的含量最高 ,K/Ca比等于 1 .30 ,而其他部位的K/Ca比均小于 1。在假根部位 ,Mn的含量在所有部位中是最高的 ,并且Mn/Fe比值最大 ,为 0 .2 1。在老叶片和假根部位 ,Cu/Zn比分别等于 1 .2 0和 1 .84,而其他部位的Cu/Zn比均小于 1。特别是这两个部位还出现了Br元素 ,这可能与器官的衰老有关。
In order to study the elemental composition and distribution of various mosses and different parts of Antarctica, we have analyzed the heavy elements of 3 species of Polytrichum by synchrotron radiation X ray fluorescence in Fildes Peninsula. The experimental specimens are P. alpinum, P. juniperinum and P. alpestre , and their elements are same nearly, including mainly K, Ca, Mn, Fe, Cu, Zn and Sr and so on. It'll show us the habitats of 3 species of Polytrichum are sililar in Fildes Peninsula. But the peak of K is very high than one of Ca, and the peak of Ca is higher than one of Fe in P. alpinum . In P. juniperinum the peak of K is higher than one of Ca, and the peak of Ca is close to one of Fe. The peak of K is nearly equal to them of Ca and Fe in P. alpestre . By X ray fluorescence analyzing different parts of P. alpestre and counting relative concentration of elements by fluorescence counts, we found that the difference of the parts is clear. The concentration of K of apical bud is the highest among parts, the proportion of K/Ca is 1.30, but that are all below 1 in the other parts. The concentration of Mn of pseudo root is the highest among parts, and the ratio of Mn/Fe is the largest, and the proportion is 0.21. In the parts of older leaf and pseudo root, the ratios of Cu/Zn are separately 1.20 and 1.84, but that are not enough 1 in the other parts. The element of Br is arisen specially in the older leaf and pseudo root parts, and that may has something to do with the organs aged.
出处
《极地研究》
CAS
CSCD
2002年第2期105-112,共8页
Chinese Journal of Polar Research
基金
国家自然科学基金项目 (4 0 0 760 3 2 )
创新工程 (KZCX2- 3 0 3 )资助
