鹤山人工马占相思林水分生态研究  

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

作　　者：曾小平[1] 赵平[1] 彭少麟[2] 

机构地区：[1]中国科学院华南植物研究所,广州510650 [2]中国科学院广州分院,广州510070

出　　处：《植物生态学报》2000年第1期69-73,共5页Chinese Journal of Plant Ecology

基　　金：中国生态系统研究网络"九 .五"重大项目!( KZ95 T-0 4-0 2 );中国科学院"九 .五"重大项目!( KZ95 1-B1-110 )

摘　　要：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 2 7.6% ;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 2 5.5% ,年蒸腾量为 162 5.1mm,占同期降水量的 78.3 % ;马占相思林的蒸腾量接近热带雨林。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.

关 键 词：马占相思 蒸腾速率 气孔导度 水分生态 人工林 

分 类 号：S718.5[农业科学—林学]