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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。
Through the determination of transpiration rate, stomatal conductance and their corresponding environmental factors in leaves of Acacia mangium plant, the ecophysiological characteristics of Acacia mangium plantations were studied. The results showed that the diurnal variation of transpiration rate and stomatal conductance were obvious. The diurnal variation trend of both transpiration rate and stomatal conductance showed a bimodal pattern in summer and single peak in winter. The transpiration rate was the highest in summer and the lowest in winter. Accounting for 2 7.6% in summer. The transpiration water consumption of Acacia mangium was significantly different between the dry season and the wet season. The transpiration water consumption during the dry season accounted for 25.5% of the rainy season, and the annual transpiration was 162.5mm, accounting for 78.3% %; Acacia mangium forest transpiration close to the tropical rainforest.