本论文以六年生枣树树干为研究对象,应用同步辐射小角X射线散射(SAXS)方法,对不同年轮枣树样品内的微孔结构进行了表征。不同年轮样品的散射图像均呈扇形分布,说明枣树内部存在针状微孔,并沿木质纤维轴择优取向。计算了微孔的长轴、短轴、长短轴比、取向角和取向度随着年轮的变化。取向角和取向度随年轮整体呈波浪式变化。从第一年轮到第二年轮,孔隙变细变长,说明枣树迅速长高;其后年轮,孔隙变短变粗,说明枣树枝繁叶茂,需要树干孔隙输送更多的营养物质。
Abstract
In this paper, the microporous structures in the samples of jujube trees with different growth rings were characterized by using synchrotron radiation small angle X-ray scattering (SAXS) method. The scattered images of different tree ring samples appear in a fan shape, indicating that there are needle-like micropores in jujube tree and the preferred orientation is along the lingo fiber axis. The long axis, short axis, long axis ratio, orientation angle and orientation degree of the micropores with the growth rings were calculated. The orientation angle and orientation degree are wavy with the whole ring. From the first ring to the second ring, the pores become thinner and longer, indicating that jujube trees grow rapidly. Subsequently, the growth rings and pores become shorter and thicker, indicating that jujube trees are flourishing and need to transport more nutrients through the pores of the trunk.
关键词
枣树 /
年轮 /
微孔结构 /
同步辐射 /
小角X射线散射
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Key words
Small angle X ray scattering /
synchrotron radiation /
Chinese jujube /
annual rings /
microporous structure
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脚注
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基金
国家自然科学基金重点项目(U1910206, U1932118);煤转化国家重点实验室开放基金(J19-20-604);国家自然科学基金重点项目(U1910206, U1932118);煤转化国家重点实验室开放基金(J21-22-604, J19-20-604);
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