侧柏和大叶相思超微弱发光土壤干旱的生理反应  

ROOT ULTRAWEAK LUMINESCENCE SUBJECTED TO SOIL DRYING IN PLATYCLADUS ORIENTALIS AND ACACIA AURICULIFORMIS

作　　者：王华芳[1] 张建华[2] 梁建生[2] 尹伟伦[1] 

机构地区：[1]北京林业大学,北京100083 [2]香港浸会大学

出　　处：《林业科学》2000年第1期2-8,共7页Scientia Silvae Sinicae

基　　金：国家自然科学基金;香港RGC(Research Grant Co m mitte)资助

摘　　要：在土壤急性和缓慢干旱处理过程中，用液体闪烁计数器的单光子监测器测定了侧柏（ Ｐｌａｔｙｃｌａｄｕｓｏｒｉｅｎｔａｌｉｓ） 和大叶相思（ Ａｃａｃｉａ ａｕｒｉｃｕｌｉｆｏｒｍｉｓ） 根系超弱发光（ＵＷＬ） 强度。结果表明，ＵＷＬ 随土壤干旱持续时间延长、土壤含水量（ ＳＷＣ） 和根系含水量（ ＲＷＣ） 下降而减少，Ｐ＜ ０－００１ 。土壤缓慢干旱时，植株根系ＵＷＬ 衰减较急性干旱时缓慢。ＵＷＬ 与植株水势（ Ψ） 在Ｐ＜ ０－１ 水平上显著相关。给干旱土壤恢复正常浇水，ＳＷＣ、Ψ和ＵＷＬ 均有所恢复，但ＵＷＬ 的恢复滞后于ＳＷＣ 和Ψ。结论是根系ＵＷＬ 作为反应树种抗旱性的生理指标比水势（ Ψ） 灵敏。We investigated the ultraweak luminescence(UWL) emitted from the root of Platycladus orientalis and Acacia auriculiformis in responsing to soil drying and in a previous cycle of soil dehydration rehydration to modify the UWL ability of root. Plants were grown in pots and subjected by rapid and slow soil drying. UWL is related to the soil drought time extend, soil water content ( SWC ) and root water content (RWC) reducing, P <0 001. But the relationship between UWL and leaf water potential ( Ψ ) is remarkable at the level of P <0 1. UWL recovers from the soil rehydration but its recovery rate is slower than SWC or Ψ . Results are discussed in the context of the sensibility of UWL to soil drought. We concluded that root UWL as an indicator of plant drought resistance is more sensitive than Ψ .

关 键 词：侧柏 大叶相思 超弱发光 土壤 干旱 生理反应 

分 类 号：S714.7[农业科学—林学] S718.516