土壤水分和光照对西葫芦生长和生理特性的影响

以西葫芦"晶莹一号"为试材,采用盆栽和人工遮光的方法研究土壤水分和光照强度对西葫芦生长发育和生理特性的影响.结果表明:遮光30%条件下各处理的植株生长较好,其中遮光30%和土壤相对含水量为70%～80%的处理植株生长最好,产量最高.遮光70%条件下,各处理的植株生长受到严重抑制,只开花,不结果,没有经济产量形成.不同处理西葫芦的耗水趋势一致,日耗水量和总耗水量都随遮光程度的增加和土壤含水量的降低而减少.遮光30%和土壤相对含水量为70%～80%的处理水分利用效率和水分产出率最高,分别为2.36和1.57 kg.mm-1·hm-2.西葫芦叶片的净光合速率、蒸腾速率、气孔导度及叶片叶绿素含量随着遮光程度的增加而减小,胞间CO2浓度随着遮光程度的增加而增加.叶片保护酶活性和脯氨酸含量随着遮光程度的增加而降低,丙二醛含量为遮光70%>自然光照>遮光30%.3种光照条件下,随着土壤含水量的增加,西葫芦叶片的光合特性、保护酶活性及脯氨酸和丙二醛含量的变化不同.

Effects of soil moisture content and light intensity on the plant growth and leaf physiological characteristics of squash

A pot experiment with artificial shading was conducted to study the effects of soil moisture content and light intensity on the plant growth and leaf physiological characteristics of squash variety Jingyingyihao.Under all test soil moisture conditions,30% shading promoted the growth of Jingyingyihao,with the highest yield at 70%-80% soil relative moisture contents.70% shading inhibited plant growth severely,only flowering and not bearing fruits,no economic yield produced.In all treatments,there was a simila...