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中文摘要：
研究不同天气条件下玉米生长期茎流特征,以期为干旱半干旱区玉米的节水灌溉及科学管理提供一定的理论依据。利用包裹式茎流计及小型自计式气象站对甘肃省会宁县太平镇夏玉米的液流通量密度以及其周围环境因子进行观测。结合人工记录,选取3种典型的天气条件对玉米液流通量密度变化趋势及其与环境因子的关系进行分析。玉米液流日变化曲线在3种天气条件下总体趋势相同,都呈现出＂几＂字型的多峰曲线,但各天气条件下液流日变化又具有各自的特点。玉米液流的变化是各环境因子综合作用的结果,各环境因子与玉米液流都呈现出极显著的线性关系。不同天气条件下影响玉米液流的主要环境因子各异,但光合有效辐射始终是影响玉米液流变化的最主要的环境因子。玉米液流日累积量在3种天气条件下从大到小的顺序依次为晴天、多云、阴雨。
英文摘要：
The objective of this paper is to offer some theoretics for water-saving irrigation and scientific management of the corn in arid and semi-arid regions by studying the characteristics of sap flow during corn growing season under different weather conditions.In this research,the sap flow rate of corn and the ambient environmental factors are observed by the packaged sap flow probe and minitype auto-meteorological station.According to the experimental records,three most typical weather conditions are gathered to analyze the changing trends of the corn sap flow and the relationship between corn sap flow and the environmental factors.On the whole,the results show that the diurnal variation of corn sap flow presents same changing trends（a curve with more than one peak） on different weather conditions.However,they have their own characteristics.The changing trend is the result of comprehensive effects of environmental factors.There is a significant linear relationship between corn sap flow and environmental factors.The main environmental factors which impact sap flow are different on various weather conditions.It is also found that PAR Light is the dominant factor affecting the sap flow under all the three weather conditions.The water consumption of corn sap flow declines in the order of sunny dayscloudy daysrainy days.
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