| CO2浓度加倍对辽东栎维管组织结构的影响 |
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| 引用本文： | 梁尔源,胡玉熹,林金星.CO2浓度加倍对辽东栎维管组织结构的影响[J].植物生态学报,2000,24(4):506-510. |
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| 作者姓名： | 梁尔源 胡玉熹 林金星 |
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| 摘 要： | 以辽东栎(Quercus liaotungensis)的13年生幼树为材料，分别培养在大气CO2浓度加倍(700μl·L-1)与对照(350μl·L-1)的开顶式熏气室中，研究CO2浓度升高对其茎次生木质部和次生韧皮部结构的影响。结果表明：经CO2浓度加倍处理的两个生长季内，辽东栎的年轮宽度明显增加，为对照的300％～370％，其中晚材宽度的增加更为显著，为对照的750％～830％。另外，晚材中导管的密度和径向直径分别比对照增加50％和20％；木纤维细胞的比例约为对照的170％。但早材的导管分子和木纤维细胞与对照相比均无显著变化。在CO2浓度加倍条件下，辽东栎的次生韧皮部中含晶韧皮薄壁细胞的数目，每条韧皮纤维切向带中韧皮纤维细胞的数目，以及韧皮纤维长度均有显著增加(p≤0.05)。相反地，韧皮纤维细胞的直径和筛管分子长度却无明显变化。值得提出的是，在CO2浓度加倍的条件下，次生韧皮部的宽度、筛管分子的直径、以及每年形成的韧皮部细胞总数分别为对照的82％、87％和80％。综上所述，大气CO2浓度加倍对辽东栎次生木质部的生长发育具明显的正效应，而对次生韧皮部的细胞总数与筛管分子的影响则呈负效应。
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| 关 键 词： | 辽东栎 CO2浓度加倍 次生木质部 次生韧 |
Effects of Doubled CO2 Concentration on Structure of Vascular Tissues of Quercus liaotungensis |
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| LIANG Er-Yuan,HU Yu-Xi,LIN Jin-Xing.Effects of Doubled CO2 Concentration on Structure of Vascular Tissues of Quercus liaotungensis[J].Acta Phytoecologica Sinica,2000,24(4):506-510. |
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| Authors: | LIANG Er-Yuan HU Yu-Xi LIN Jin-Xing |
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| Abstract: | The structure of secondary xylem and secondary phloem of Quercus liaotungensis grown under conditions of ambient (350 μl·L-1) and doubled CO2 concentration (700 μl·L-1) was investigated. Statistical analysis of results indicated that ring width increased significantly under the CO2-enriched environment, which was 300%–370% of those from plants grown under ambient CO2 environment (CK). In particular, latewood width was affected much more strongly by the treatment. Furthermore, vessel number per square millimeter and radial diameter of vessels of latewood as well as ratio of wood fibers also increased, 150%, 120% and 150% respectively of that observed under CK. Nevertheless, no dramatic change was observed in terms of mean length and tangential diameter of vessels, thickness of cell wall and length of fibers of secondary xylem. In the secondary phloem, mean length and number of phloem fibers and crystalliferous parenchyma cells per phloem fiber band increased in response to higher CO2(p≤0.05). In contrast, width and total cells of secondary phloem formed each year and diameter of sieve tubes were reduced to 82%, 80% and 87% of that of the CK grown plants respectively with increased CO2 concentration. It was concluded that secondary xylem responded positively, while the diameter of sieve tubes and the width of secondary phloem showed a negative response to CO2-enrichment during the experiment. |
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| Keywords: | Quercus liaotungensis Doubled CO2 concentration Secondary xylem Secondary phloem |
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