【摘要】 在温室条件下,通过测定苗木叶水势、水分饱和亏缺、叶失水速率、水分释放曲线和束缚水含量等指标,探讨4种木麻黄的水分生理生态特性。结果表明,木麻黄苗木叶水势与土壤水势呈显著的指数关系,与水分饱和亏缺呈紧密的线性关系,叶水势的日变化呈单峰型。从苗木叶水势和水分释放曲线的变化动态,及叶失水速率与束缚水含量等指标来看,4种木麻黄维持水分平衡的机制较为相似,但不同木麻黄树种在水分亏缺条件下吸持水能力存在明显的差异。更多还原

【Abstract】 The main indicators of leaf water potential,water saturation and deficit,rate of water loss,water re- lease curve and bound water content were examined in the green house,to make an approach to the general wa- ter eco-physiological characteristic of tree seedlings for 4 Casuarina species.The results showed that there was a clear exponential relation between leaf water potential and soil water potential,a good linear relation be- tween leaf water potential and soil water saturation deficit,and the daily variation of leaf water potential is one -humped type.Judged by the indicators of variation tendency of leaf water potential and water release curve, rate of water loss and bound water content,the mechanisms of maintaining water balance for 4 Casuarina spe- cies were similar,but their water-absorbing and water holdong abilities were obviously different under the cir- cumstance of water deficit.更多还原