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[1]LIU Zhan-dong,GAO Yang,GONG Wen-jun,et al.Study on Winter Wheat Canopy Interception Process of Rainfall and Simulation[J].Research of Soil and Water Conservation,2012,19(04):53-58.

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Study on Winter Wheat Canopy Interception Process of Rainfall and Simulation

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 19 Number of periods: 2012 04 Page number: 53-58 Column: Public date: 2012-08-20

Title:: Study on Winter Wheat Canopy Interception Process of Rainfall and Simulation

Author(s):: LIU Zhan-dong^1,2, GAO Yang¹, GONG Wen-jun³, DUAN Ai-wang¹; 1. Key Laboratory of Crop Water Use and Regulation of Ministry of Agriculture, Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, He’nan 453003, China;
2. Graduate University of Chinese Academy of Agricultural Sciences, Beijing 100081, China;
3. Guangli Irrigation Authority of Jiaozuo City, He’nan Province, Qinyang, He’nan 454550, China

Keywords:: winter wheat; rainfall; canopy interception; simulation; model

CLC:: S181.6

DOI:: -

Abstract:: The effective utilization of rainfall by winter wheat was directly influenced by canopy interception. Influences of rainfall and rainfall intensity on characteristics of canopy interception of winter wheat were studied by simulative rainfall experiment and statistical analysis, and a canopy interception model suitable for winter wheat was established. The results showed that throughfall was significantly positively related with rainfall (P<0.01), while relationships between canopy interception and rainfall significantly showed a power function (P<0.01). A negative exponential correlation between rainfall intensity and percentage of throughfall (P<0.01) and a negative power correlation between rainfall intensity and percentage of interception (P<0.01) were found. The trend of canopy interception of winter wheat was consistent under different rainfall intensities, while the duration to reach the canopy interception capacity was longer with lower rainfall intensity. Rainfall intensity had no significant influence on canopy interception capacity of winter wheat. Interception decreased with the increase of rainfall intensity, indicating a negative relation with rainfall intensity at the constant rainfall conditions. Canopy interception capacity of winter wheat showed a positive correlation with LAI (P<0.01). A mechanism model for rainfall interception process of the winter wheat was developed, and the model parameters were fitted based on the measured data both from the natural rainfall experiment and simulated rainfall experiments. A parameter, α, indicating evaporative capacity of rainfall intercepted by winter wheat canopy, was set to 0.008. Simulated values were consistent with measured ones, indicating that the improved model can be used for estimating rainfall interception of winter wheat canopy.

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