| 摘要: |
| 香樟(Cinnamomum Camphor)是南方城市绿化、美化的重要树种，古香樟客观记录了社会发展和物种变迁，但其衰老现象日趋严重。本文从营养亏缺理论出发，对不同生长势古香樟叶片12种矿质元素进行分析，以期找到引起其衰老的关键元素，为古树名木评价和复壮提供依据。研究结果表明：季节间Mg和Fe含量差异显著，其他元素含量差异不显著。不同生长势香樟植株间各元素含量差异显著。按欧式距离 dij=5进行聚类分析，将供试香樟根据生长势由强到弱划为Ⅰ、Ⅱ、Ⅲ 3个等级。随着衰老程度的加深，Na和Al的含量上升，其他元素的含量下降，N、P、K比例失衡。主成分分析提取3个主成分，累计方差贡献率94.91%。第一主成分方差贡献率69.25%，包含P、K、Mg、Ca、Fe、Cu、Zn、Mn、B；第二主成分贡献率13.45%，包含N；第三主成分贡献率为12.21%，包含Al、Na。 |
| 关键词: 古香樟 衰老 矿质营养 生长势 |
| DOI： |
| 分类号: |
| 基金项目:国家质检公益性行业科研专项（项目编号：200810412）资助。 |
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| Analysis of Mineral Nutrition of Ancient Cinnamomum camphor \=with Different Growth Potential |
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Zhang Li-juan
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| Abstract: |
| Cinnamomum Camphor is a very important species for greening and beautifying in southern city. Ancient C. Camphor objectively records the social development and species change, however, its aging is increasingly serious. Based on nutritional deficit theory, we analyzed 12 kinds of mineral elements in leaves of ancient C. Camphor with different growth potential, in order to find the key elements caused aging and provide theory basis of aging evaluation and regeneration. Results showed that, there was difference in the contents of Mg and Fe between different season, but no significant difference in the others. Significant difference existed in all elements between different trees. When dij was 5 (dij means Euclidean distance), the tested C. Camphor could be divided into 3 grades (I, II and III, respectively) according to growth potential (from strong to weak) by clustering analysis. With senescence aggravating, the content of Na and Al in leaves increased, while the others decreased, and the ratio of N, P and K was imbalanced seriously. By principal component analysis, three main components were extracted, whose accumulative total variance contribution rate was 94.91%. The variance contribution of the first principal component was 69.25%, including P, K, Cu, Fe, Mg and B. The second principal component was N, its variance contribution was 13.45%. The variance contribution of the third principal component was 12.21%, including Ca, Al, Zn and Mn. |
| Key words: ancient Cinnamomum Camphor senescence mineral nutrition growth potential |
