应用热平衡法对黄土高原玉米茎流变化规律的研究  

Research on Stem Flow Variation of Zea mays L. in Loess Plateau by Stem Heat Balance Method

作　　者：胡雅杰[1] 闫业庆[1] 张旭昇[1] 魏国孝[2] 

机构地区：[1]兰州大学资源环境学院,甘肃兰州730000 [2]兰州大学西部环境与气候变化研究院,甘肃兰州730000

出　　处：《安徽农业科学》2010年第22期11893-11894,12258,共3页Journal of Anhui Agricultural Sciences

基　　金：青藏高原和中东亚干旱区环境变化与地表过程研究(西部干旱环境变化);国家自然科学基金创新群体项目(40721061)

摘　　要：[目的]探讨黄土高原玉米茎流变化规律及其与环境因子之间的关系。[方法]利用热平衡茎流计实时监测会宁县玉米样株茎流日变化,数据处理采用Excel软件。[结果]玉米茎流日变化过程显著,白天茎流速率大且波动较大,晚上茎流速率小而平稳;午间出现茎流的小幅减小,这与叶片气孔开度改变为维持植物体内水分平衡有关。通过相关分析得出,茎流速率与太阳辐射和温度呈正相关关系,其中与太阳辐射的关系更为密切。[结论]为节水灌溉和玉米增产提供理论依据。[Objective] The aim was to study the relationship between the stem flow variation of Zea mays L.and environmental factors.[Method]Heat balance flow neter was used to monitor the diurnal change of stem sap flow of Zea mays L.,and excel soft ware was used for data processing.[Result]The results indicated that the diurnal variation of stem flow of Zea mays L.had a clear rhythm,the rate of stem flow was bigger,and the undulation were more in daytime,the rate of stem flow in the night was smaller and the undulation was smooth.At noon the rate of stem flow declined by small margin,which was relative to the change of foliaceous stomatal aperture in order to keep the water balance of Zea mays L..The correlation analysis showed that there was a significant positive correlation between the rate of sterm flow and solar radiation and temperature.especially solar radiation.[Conclusion]The study provided a theoretical basis for water-saving irrigation and corn yield.

关 键 词：玉米 热平衡法 黄土高原 茎流量 日变化规律 

分 类 号：S311[农业科学—作物栽培与耕作技术]