中文摘要：

通过对广西弄拉典型峰丛洼地生态系统中不同地貌类型的青冈栎（Cyclobalanopsis gala）叶片的生理生化指标进行测定，结果表明：山顶青冈栎的含水量比山中部的高，但水分饱和亏和需水程度比山中部的低。山顶的小气候环境相对恶劣，青冈栎受到的水分胁迫比较严重，相反，山中部的青冈栎的需水程度比山顶高。山顶青冈栎为适应干旱的环境形成各种结构，如缩小的叶面积、加厚的角质层、凹陷的气孔等，以降低它的蒸腾速度，能有效地控制水分的损失，而对水分供应不足的适应同时也降低了光合作用，因此，岩溶山顶青冈栎的径向生长速度要比山腰的慢得多。

英文摘要：

Some phgsiological index Cyclobalanopsis gtauca of different physiognomy in fengcong depression ecological system in Guangxi Nongla, were measured. The results were as fellows： It indicated that the water content in leaf of Cyclobalanopsis gtauca is higher than that in the middle of mountain, while the natural satutation deficiency , degree of need water is lower than that in the middle of mountain. The Cyclobalanopsis g/auca on the top of mountain has more serious water stress, but its degree of need water is lower than that in the middle of mountain . Some of the adaptation on the top of the mountain, such as the less leaf area, the thicker cuticle, the hollow stomata, can reduce its transpiration, at the same time, its photosynthesis also decrease. So the Cyclobalanopsis gtauca on the top of mountain grows slowly.