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OALib Journal期刊
ISSN: 2333-9721
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干旱胁迫对香樟幼树生长及光合特性的影响
DOI: 10.3724/SP.J.1145.2013.12019, PP. 672-685
Keywords: 香樟幼树,干旱胁迫,光合特性,水分生理,形态生长
Abstract:
通过盆栽和持续干旱研究了干旱胁迫（以2d为一个处理间隔，持续干旱0-16d）对香樟（cinnamomumcamphora）幼树生长及光合特性的影响.结果显示：（1）干旱胁迫下香樟幼树的地径、树高生长量受到了抑制.轻度、中度干旱处理（干旱时间2-8d）叶片含水量和叶片相对含水量与对照差异均不显著，重度干旱处理（干旱时间＞10d）下显著低于对照（p<0.01）；（2）干旱胁迫影响了香樟叶片光合作用的日变化进程，妨碍了其有机物质积累；（3）干旱胁迫下香樟叶片光合色素总量先升高后降低，在干旱第8天达到最高.所有干旱处理的净光合速率（pn）、蒸腾速率（tr）、气孔导度（gs）均受到不同程度的抑制.气孔因素和非气孔因素共同作用影响香樟幼树的光合作用，在干旱初期（干旱时间2-8d）气孔因素起主导作用，干旱后期（干旱时间＞10d）非气孔因素起主导作用；（4）干旱胁迫下香樟幼树叶片的表观量子效率（aqy）、rubp羧化速率（ce）、光补偿点（lcp）、光饱和点（lsp）及co2补偿点（ccp）均显著降低，表明干旱会降低香樟幼树对环境中光照和co2的利用及适应能力.综上，干旱胁迫下香樟幼树的水分生理状况变差，光合能力及光合日变化进程受到影响，对环境中光照和co2的利用及适应能力也明显降低，最终香樟幼树的形态生长受到抑制.图3表3参35
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