不同光照和水分对吊罗山薹草生长的影响

为掌握吊罗山薹草在生境适宜性中对光照及水分的需求特性,采用人工控制光照强度和土壤含水量的方法（设置4个光照和3个水分水平的双因素实验）,研究光照强度和土壤含水量对其生长的影响。结果表明,低水分条件抑制吊罗山薹草的生长,但40%（L3）光照和30%（W3）水分的互作下各项指标表现相对较好,说明适当的遮荫有助于减少水分亏缺对其造成的伤害;全光照（L1）条件下的净光合速率（P_n）显著降低,丙二醛（MDA）含量显著上升,生长受到抑制,而40%（L3）光照条件下,P_n值在不同水分条件下均出现最高值;在水分充足的条件下,40%（L3）光照和10%（L4）光照处理下的叶绿素含量和净光合速率之间不存在显著差异,但与全光照（L1）和70%（L2）光照条件下的差异显著,说明吊罗山薹草对高光敏感。综上,吊罗山薹草在生境选择上不适宜低郁闭度和低水分,40%光照和70%土壤水分是其最佳生长环境。

Effect of Light Intensity and Water Content on the Seedling Growth and Physiological Characteristics of Carex diaoluoshanica

In order to explore the characteristics of the demand for light and soil moisture of Carex diaoluoshanica, the effects of light intensity and soil moisture on its growth were studied by controlling light intensity and soil moisture content. Low water content seriously inhibited the growth of C. diaoluoshanica, but the interaction of 40% light and 30% water showed relatively good performance, indicating that appropriate shading could reduce the damage caused by water deficit. Under the condition of full light, the net photosynthetic rate (P_n) decreased significantly, while the malondialdehyde (MDA) content increased significantly, and the growth was inhibited. The highest P_n occurred under 40% light intensity. Under the condition of sufficient water, there was no significant difference in chlorophyll content and net photosynthetic rate between 40% and 10% light treatments, but there were significant differences between them under full light and 70% light conditions, which fully indicated that C. diaoluoshanica was sensitive to high light and was not conducive to its growth. In conclusion, it is not suitable for low caopy density and low water content in the habitat selection for C. diaoluoshanica, and 40% light intensity and 70% soil moisture are the best environment for its growth.