内蒙古通辽膜下滴灌玉米棵间蒸发量SIMDual_Kc模型模拟  

Simulation of evapotranspiration of corn under mulched drip irrigation based on SIMDual_Kc model in Tongliao area of Inner Mongolia

作　　者：李瑞平[1] 赵靖丹 史海滨[1] 王宁 戚迎龙 冯亚阳[1] 贾琼 

机构地区：[1]内蒙古农业大学水利与土木建筑工程学院,呼和浩特010018 [2]内蒙古自治区水利科学研究院,呼和浩特010051

出　　处：《农业工程学报》2018年第3期127-134,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家"十二五"科技支撑计划课题(2014BAD12B03)

摘　　要：为明确内蒙古东北部地区玉米膜下滴灌棵间蒸发的变化规律,探索玉米膜下滴灌节水增产机制,在田间试验的基础上,采用经过参数率定与验证的双作物系数SIMDual_Kc模型,模拟分析了土壤含水率、土壤棵间蒸发及作物系数的变化规律,结果表明:1)双作物系数SIMDual_Kc模型模拟内蒙古东北部地区滴灌玉米土壤含水率与实测值具有很好的一致性;2)利用双作物系数SIMDual_Kc模型估算出该地区覆膜玉米生育初期、中期和后期作物系数分别为0.15、1.05、0.4,无膜滴灌玉米初期、中期和后期作物系数分别为0.15、1与0.4;3)根据双作物系数模型SIMDual_Kc模拟了2014和2015年滴灌玉米棵间蒸发量占作物蒸散发的比例,覆膜滴灌较无膜滴灌少,说明覆膜能有效降低作物棵间蒸发量,具有降低作物耗水量的潜在优势。研究结果可以为内蒙古东北部地区玉米滴灌生产实践提供科学依据。In recent years, the mulched drip irrigation due to its efficient irrigation has been promoted in Inner Mongolia. However, few studies have focused on this area. In this study, we investigated the difference soil evaporation under the film mulching and bare land in order to clarify the change law of evaporation of corn and explore the mechanism of water saving and yield increase of corn under mulched drip irrigation in Northeast of Inner Mongolia. The SIMDual_Kc model was used to simulate the change of crop coefficient. And the crop coefficient was used for soil evaporation calculation. The model was calibrated by the results from the filed experiment. The field experiment was carried out in 2014 and 2015. A total of 3 treatments including low, mid and high water treatments were designed based on field capacity. The corn was planted under the mulching and bare land. The soil moisture was determined by TDR and the soil evaporation was measured by standard and self-made lysimeters. Meanwhile, the corn height and leaf area were determined during the growing period of corn. The model calibration and validation results showed that the simulated soil moisture agreed well with the measured values. The R^2 was 0.85-0.91 and the root mean square error was 1.0% and below. The soil moisture under the film mulching was lower than that of bare land after rainfall. It indicated that the film could prevent rainfall into soil. The simulated soil moisture of film mulching was higher than that of bare land, suggesting that the film could protect soil moisture from evaporation. Based on the simulation, the basal crop coefficient was 0.15, 1 and 0.4 under the bare land and 0.15, 1.05 and 0.4 under the film mulching in the early, middle and late growth stage of corn. In the early stage, the basal crop coefficient and its adjustment was similar for the treatment of bare land since the root was shallow and continuous rainfall. In the middle stage, the transpiration dominated and the soil evaporation coefficient was the lowest. In the l

关 键 词：蒸发 蒸散 膜 内蒙古东北部地区 膜下滴灌 SIMDual_Kc模型 

分 类 号：S275.6[农业科学—农业水土工程]