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以1年生樟树(Cinnamomum camphora)实生苗为试验材料,通过自然干旱的方法人工模拟干旱胁迫环境,研究不同种植密度下(10、20、40、80株·m~(-2))幼苗对干旱胁迫各个时期(4、8、12、16、20 d)的生理响应,确定樟树对幼苗干旱和不同种植密度的响应机制。结果表明,各密度幼苗叶片的相对含水量随干旱胁迫时间的延长而下降,在各干旱胁迫阶段的下降幅度随密度的增加而加大;除10株·m~(-2)幼苗外,其他密度幼苗的叶片叶绿素含量随干旱时间的延长先升后降,变化幅度随着密度的增加而增大;各密度下的幼苗叶片可溶性糖含量、可溶性蛋白质含量和SOD的活性均随干旱时间的延长而上升,幼苗叶片的脯氨酸和丙二醛(MDA)含量趋于上升,上升幅度随密度的增加而加大。总体来看,樟树幼苗抗旱能力随着密度增加而下降。
The seedlings of one-year-old Cinnamomum camphora were used as experimental material to simulate the drought stress environment by natural drought. The effects of different planting densities (10, 20, 40, 80 plants · m -2) Physiological responses to various periods (4, 8, 12, 16, 20 d) were used to determine the response mechanism of camphor to seedling drought and different planting densities. The results showed that the relative water content of all density seedling leaves decreased with the prolongation of drought stress and decreased with the increase of density in all drought stress stages. In addition to 10 seedlings of m -2, The leaf chlorophyll content of seedlings increased firstly and then decreased with the prolongation of drought time, and the change range increased with the increase of density. The soluble sugar content, soluble protein content and SOD activity of seedling leaves under different densities increased with the prolongation of drought time However, the contents of proline and malondialdehyde (MDA) in seedling leaves tended to increase with the increase of density. Overall, the drought resistance of camphor seedlings decreased with increasing density.