鹤山人工马占相思林水分生态研究

 通过对马占相思叶片的蒸腾速率、气孔导度及其相应环境因子的测定，探讨鹤山丘陵人工马占相思林的水分生理生态特征。结果表明：蒸腾速率和气孔导度具有明显的日变化，两者的变化趋势相似，在夏季的日变化曲线呈双峰型，冬季呈单峰型；夏季的蒸腾速率最高，在冬季最低，仅占夏季的27.6％；马占相思林的蒸腾耗水量在旱季和雨季有明显的差异，旱季的蒸腾耗水量占雨季的25.5％，年蒸腾量为1625.1mm，占同期降水量的78.3％；马占相思林的蒸腾量接近热带雨林。

STUDY ON THE WATER ECOLOGY OF ARTIFICIAL ACACIA MANGIUM FOREST IN THE HESHAN HILL REGION,GUANGDONG PROVINCE

Transpiration rate (E) and stomatal conductance (gs) in leaf of Acacia mangium were measured in a subtropical low hilly area of Guangdong Province, South China. Results showed that E and gs had a similar daily variation, both exhibiting a bimodal pattern in summer, and single peak pattern in winter. The highest average E was found in summer, and the lowest in winter: E in winter was just 27 6% of that in summer. The water consumption through transpiration of the A. mangium forest showed a clear difference between drought and wet seasons. Annual water consumption through transpiration was calculated as 1625 1mm, which accounted for 78 3% of precipitation during the same period. The result indicated that water consumption through transpiration of A. mangium forest could approach that of a tropical rainforest.