鹤山丘陵豆科混交林下几种植物的水分生态研究

测定了鹤山豆科混交林的土壤含水量、林下３种植物（三叉苦、鬼灯笼和山菅兰）叶片的蒸腾速率、气孔导度和相应的环境因子，了解林下植物的水分生理生态特性。在湿季，蒸腾速率和气孔导度的日变化曲线呈单峰型，两者的变化趋势相似。在旱季，两者之间的日变化曲线存在差异，山菅兰的蒸腾速率呈双峰型，其它两种植物呈单峰型；气孔导度的峰值都出现在早晨。鬼灯笼的蒸腾速率和气孔导度最高，生于底层的草本植物山菅兰最低，湿季的蒸腾速率和气孔导度高于旱季。

Study on the Water Ecology of Three Understory Plantsin a Leguminous Mixed Forest in Heshan Guangdong

The transpiration rate (Trans. ) and stomatal conductance (Cond. ) in leaves of three un- derstory plants (Dianella ensifolia, Clerodendron fortunatum, Evodia lepta) in an artificial leguminous mixed forest were measured in Heshan Hilly Land Interdiscipliary Station, Guangdong. TheTrans. and Cond. had similar daily variation in June, the daily variation courses of Trans. and Cond.exhibited single-peak pattern. In October, the daily variation of Trans. of D.ensifolia andC .fortunatum exhibital single-peak pattern, and two-peak pattern for E. lepta, the maximum Cond.of three plants were found in the morning. The daily average Trans. and Cond. in June were higherthan that in October. The Trans. and Cond. of C.fOrtunatum was the highest and that of E. lepta wasthe lowest.