采用TDP技术对金沙江干热河谷元谋段主要造林树种印楝的树干液流密度动态变化进行了观测,得到3点主要结论:①无论干热季节或湿润季节,印楝树干液流密度昼夜变化的规律性较强,呈明显的单峰曲线;②由干热季节转向湿润季节时,印楝树干液流密度呈下降趋势,5年生印楝在5月、7月及10月的典型晴天里的树干液流密度日变化平均值分别为12.11、7.48及6.90cm3·cm-2·h-1;③在干热季节里印楝蒸腾耗水具有相当的被动性,而在湿润季节时其蒸腾耗水则表现出主动性和平氨性,反映了印楝在不同季节里的耗水机制差异.%Based on TDP technology , the dynamics of sap flux density of Azadirachta indica A. Jussw was observed in the dry-hot valleys of the Jinsha River, and three main conclusions were gotten. ( i ) whether the day and night change af trunk sap flux denaity of Azadirachta indica A. Juss had strong law , and presented gingle and wide peak in dry and hot season or wet season. ( ii ) when the environmental changes from dry and hol season to wet season, the trunk sap flux density of Azadirachta indica A. Juss got decreasing, the daily averages of sap flux density for five-year old Azadirachta indica A. Juss reached 12. 11 , 7. 48 and 6. 90 cm3 . cm -2 . h -1 , respectively. ( iii ) water consumption by transpiration of individual stem in dry and hot season had great passivity, however, while water consumption by transpiration of individual stem in wet seaaon presented initiative and balanced quality, which reflected the differences of water consumption mechanism of Azadirachtu indica A. Juss among different seasons.
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