水分胁迫及自然复水对澳洲坚果幼苗叶片性状的影响*

 以澳洲坚果幼苗为试材,探讨水分胁迫及复水处理下叶片性状的适应性变化。结果表明,澳洲坚果幼苗在水分亏缺胁迫下叶面积、比叶面积呈现下降趋势,水分胁迫强度越大,其下降越大,叶绿素总量呈现先降后升趋势,脯氨酸积累量显著升高;复水30 d后,水分亏缺处理下的澳洲坚果单叶面积、比叶面积、叶绿素总量表现出显著的补偿效应,胁迫程度大,反弹大;在西双版纳特有的旱季与雨季区别明显情况下,饱和土壤水分处理（对照）下,澳洲坚果幼苗单叶面积、比叶面积、叶绿素总量在旱季均有不同程度下降,自然复水后略有上升,相反脯氨酸含量呈现先升后降。

Effect of Water Stress and Natural Rewatering on Leaf Traits of Macadamia Seedlings

The changes of leaf trait physiological indices of Macadamia seedlings under water stress and rewatering were studied. The result showed that under water stress, the leaf area and the specific leaf area of the Macadamia seedlings decreased,the severer the water stress was,the bigger the decline was,chlorophyll content decreased early and increased late, the proline content significantly increased;after 30 d natural rewatering,the obvious compensatory growth or effects of leaf area, specific leaf area and chlorophyll content of the Macadamia seedlings occurred under water deficit,the severer the water stress was,the bigger the rebound was. In the case that the rainy and dry seasons were obviously different in Xishuangbanna,the leaf area, specific leaf area and chlorophyll content of the Macadamia seedlings rose under saturated soil water (CK) in dry seasons and fell after natural rewatering,but the proline content increased at first and decreased after natural rewatering in dry season．