土壤水分胁迫与遮荫对生姜生长特性的影响

水分胁迫使生姜叶片叶绿素含量降低，叶片气孔密度及气孔面积减小，根系活力下降。根系伤流量减少，在相同土壤水分条件下，遮光使叶片叶绿素含量增加。气孔密度减小，叶片上表皮气孔变大，而下表皮气孔变小。根系活力增强，水分胁迫显著影响生姜的生长与产量，但不同水分条件下，光强对生姜生长与产量的影响不同，正常供水条件下，生姜在自然光照条件下生长较好，产量较高；水分胁迫条件下，生姜在遮荫条件下生长较好，产量较高。

Effects of soil water stress and shading on growth characteristics of ginger

Water stress decreased the chlorophyll contents, stomatic density, and stomatic size of ginger leaves, and reduced the root activity and magnitude of bleeding sap of ginger roots. Under the same water contents, shading increased the root activity and the chlorophyll contents and stomatic size of upper cuticulae of ginger leaves, but decreased the stomatic density and size of their lower cuticulae. Water stress influenced the growth and yield of ginger significantly, but the effects of light intensity on ginger growth and yield were different under different water contents. Under normal water content, ginger grew better and yield was higher in natural sunlight, while under water stress, ginger grew better and yield was higher in shading.