西双版纳地区不同类型植物叶片对雾水的吸收

目的]探讨雾对西双版纳地区植物的水分效应。方法]于雾凉季选取西双版纳地区2种附生植物大叶南苏和狮子尾以及分别生长在雨林和石灰山的大叶藤黄、黄花胡椒和红雾水葛为材料,测定其叶片水势的日变化。结果]一般早上8：00左右植物叶片水势最高,午后14：00水势最低。植物可通过叶片吸收雾水,当水势值较低的叶片被蒸馏水喷雾后,其水势值升高趋势先快后慢,且叶片对水分的吸收速率较高。附生植物叶片比非附生植物叶片吸水快且多;同种植物生长在石灰山的植株叶片吸水后水势恢复比生长在雨林中的植株快。结论]生长在石灰山的植物更能有效利用雾水。

Leaf Absorption of Plants of Different Types to Fog in Xishuang Banna Region

Objective] The purpose of this study was to discuss the moisture effect of fog on plants in Xishuang Banna region.Method] In fog cool season,Rhaphidophora peepla,Rhaphidophora hongkongensis,Garcinia xanthochymus,Piper flaviflorum and Pouzolzia sanguinea were selected from Xishuang Banna region as materials for determining the daily variation of water potential of leaf,among which R.peepla and R.hongkongensis were epiphytes and G.xanthochymus,P.flaviflorum and P.sanguinea were growing in rain forest and lime mountain resp.Result] Generally,the water potential of plant leaves was highest at about 8:00 a.m.and that was lowest at 14:00 p.m.The plants could absorb fog through leaves.After the leaves with lower water potential values were sprayed with distilled water,the ascending of their water potential values was first fast and then slow and the absorption rate of leaves to water was higher.The water absorption of epiphyte leaves was faster and more than that of non-epiphyte leaves.In the comparison of the same plant species,the restoration of water potential of plant leaves growing in lime mountain after absorbing water was faster than that of plant leaves growing in rain forest.Conclusion] The plants growing in lime mountain could utilize fog more effectively.