河北省清苑县平原区国槐耗水特征研究

Water Consumption Characteristic of Sophora japonica in Plain Area of Qingyuan County,Hebei Province

以保定清苑县北王力乡林场的国槐(Sophora japonica)为研究对象,采用热扩散式探针法(TDP)检测国槐在不同季节、不同时刻的耗水量,分析国槐耗水量在不同生长季节下的波动规律。结果表明:在春季4—6月,平均耗水量约为1.34 mm·d^(-1),日耗水量波动不大。在夏季7—9月,日耗水量相比春季的日耗水量波动较大,尤其是8月的耗水量波动最大,夏季的平均日耗水量为1.08 mm·d^(-1),夏季的日耗水量相较于春季的日耗水量有所减少。在秋季10—11月份,10月份的平均日耗水量1.29 mm·d^(-1)左右,11月份日平均耗水量1.25 mm·d^(-1)左右,秋季的日耗水量相比夏季的耗水量有所上升,波动幅度较前两个季度平稳。1天内不同时间和不同生长季节中耗水量的差异与气候息息相关。

This study investigated the fluctuation of water consumption of Sophora japonica in Beiwangli Township forest farm(Qingyuan County,Baoding)in different growing seasons.The water consumption rate of S.japonica in different seasons and different times were measured by thermal diffusion probe(TDP)method.The results indicated that the average daily water consumption of S.japonica was 1.34 mm·d^(-1)in spring(from April to June),and the fluctuation of the daily water consumption was low.In summer,between July and September,the average daily water consumption was 1.08 mm·d^(-1),which was smaller than that in spring.The fluctuation of the daily water consumption in summer was relatively larger than spring,especially in August,which had the most significant fluctuation.The average daily water consumption in autumn had increased compared with that in summer,and the fluctuation was relatively stable compared with the previous two seasons.The average daily water consumption were 1.29 mm·d^(-1)and 1.25 mm·d^(-1)in October and November,respectively.The difference of water consumption at different times of the day and in different growing seasons were closely related to climate.