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中文摘要：
采用包裹式茎流计和小型自记式气象站对甘肃省会宁县太平镇主要农作物玉米的茎流速率及其周围的气象因子进行同步观测。分析结果表明：1）玉米的日茎流速率变化趋势基本一致,都呈＂几＂字型变化。晴朗天气下,茎流启动时间为6：00,于14：00-15：30达到峰值,持续较短时间后迅速降低,至晚上22：00达到较低值且在夜间保持了一定的茎流活动。而多云和阴雨天气玉米茎流速率则呈不规则曲线。2）玉米茎流速率与气象因子变化趋势相吻合。相关性分析结果表明,影响玉米茎流的主要因子依次是：光合有效辐射、空气温度、空气湿度、风速。玉米茎流速率与气象单因子分析及逐步回归方程表明,对半干旱区玉米茎流起关键作用的气象因子是光合有效辐射与空气湿度。
英文摘要：
With the packaged sap flow probe and combined with minitype auto -meteorological station, we simultaneously measured and monitored the sap flow rate of corn and the ambient meteorological factors at Huining, Gansu. Results were as follows： （ 1 ） The diurnal variations of sap flow rate of corns with different diameters presented the same changing trends （a curve with one or more peaks）. The sap flow of corns started at 6：00, then reached the maximum value during 14：00 - 15：30 and after lasting a little time it would rapidly decreased. The sap flow rate of corns would be into a weak active stage until 22：00 and it maintained a certain value during night. While the sap flow rate presented irregular curves in cloudy and rainy weather. （2）Both the variations of the sap flow rate of corns and the meteorological factors had the similar trend. The results of correlation analysis showed that the order of their coefficient was PAR（ photosynthesis available radiation） 〉 air temperature 〉 air relative humidity 〉 wind speed. The curve estimation and the model of multiple stepwise regression revealed that PAR and air relative humidity were the key factors affected the sap flow rate of corn a lot during growth period in semi - arid area.
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