基于修正双作物系数模型估算温室黄瓜不同季节腾发量  

Estimation of greenhouse cucumber evapotranspiration in different seasons based on modified dual crop coefficient model

作　　者：闫浩芳[1] 毋海梅 张川[2] Samuel Joe Acquah 赵宝山 黄松 Yan Haofang;Wu Haimei;Zhang Chuan;Samuel Joe Acquah;Zhao Baoshan;Huang Song(Research Center of Fluid Machinery Engineering and Technology,Jiangsu University,212013,China;Institute of Agricultural engineering,Jiangsu University,212013,China)

机构地区：[1]江苏大学流体机械工程技术研究中心,镇江212013 [2]江苏大学农业工程研究院,镇江212013

出　　处：《农业工程学报》2018年第15期117-125,共9页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(51509107,51609103);江苏省自然科学基金(BK20150509,BK20140546),江苏省高校优势学科。

摘　　要：为估算温室黄瓜植株蒸腾与土面蒸发,该研究基于FAO-56推荐的双作物系数模型,应用温室内实测微气象、叶面积指数(LAI)及土壤水分数据,对模型中基础作物系数(Kcb)和土面蒸发系数(Ke)进行修正,并基于修正后FAO-56Penman-Monteith(P-M)模型,确定温室参考作物蒸发蒸腾量(ET0),进而估算温室黄瓜蒸发蒸腾量(ETc)和植株蒸腾(Tr)。基于Venlo型温室内黄瓜不同种植季节(春夏季和秋冬季)Lysimeter和茎流计观测的黄瓜ETc和Tr,对修正后的双作物系数模型预测结果进行验证。结果表明,应用修正后的双作物系数模型估算的温室黄瓜ETc和Tr与实测值具有较好地一致性,春夏季温室黄瓜全生育期ETc估算值与实测值的日均值分别为3.05和2.94 mm/d,秋冬季分别为2.53和2.76 mm/d。修正后的双作物系数模型估算春夏季温室黄瓜日ETc的决定系数(R2)、均方根误差(RMSE)和模型效率系数(Ens)分别为0.95、0.41 mm/d和0.93;估算秋冬季ETc的误差计算结果依次为0.91(R2)、0.48 mm/d(RMSE)和0.90(Ens)。修正后的双作物系数模型估算春夏季日平均Tr与实测值分别为2.37和2.19mm/d,秋冬季分别为1.43和1.34 mm/d。研究结果还显示,不同种植季节温室黄瓜全生育期日平均Tr占ETc的比例分别为64.62%(春夏季)和68.59%(秋冬季)。该研究成果不仅为制定准确的温室黄瓜灌溉制度提供了理论依据,而且对实现温室环境智能化控制及减少温室内无效的土面蒸发具有重要意义。In order to estimate the transpiration of greenhouse cucumber and evaporation beneath the canopy in greenhouses,in this study,we modified basic crop coefficient(Kcb)as well as soil evaporation coefficient(Ke)based on the Modified Dual Crop Coefficient model recommended by FAO-56 by applying measured meteorological data,leaf area index(LAI)and soil moisture data in a greenhouse.The greenhouse reference crop evapotranspiration(ET0)was determined by FAO-56 modified Penman-Monteith(P-M)model.Hence,the greenhouse evapotranspiration(ETc)and transpiration(Tr)were estimated.A field experiment was conducted from March to July(spring-summer)and August to November(autumn-winter)in 2017.By measuring the growth status of cucumber plants in different planting seasons(spring-summer,autumn-winter)in a Venlo-type greenhouse and measuring the ETc and Tr of cucumber by lysimeter and stem flow meter,the Modified Dual Crop Coefficient model predictions were validated.The results showed that the ETc and Tr calculated by the Modified Dual Crop Coefficient model were in good agreements with the measured values.The measured and estimated values of ETc during the whole growing period of greenhouse cucumber in spring-summer were 2.94 and 3.05 mm/d,and the measured and estimated values of ETc during the whole growth period of greenhouse cucumber in autumn-winter were 2.76 and 2.53 mm/d,respectively.The coefficient of determination(R2),the root mean square error(RMSE),and the model efficiency coefficient(Ens)of the Modified Dual Crop Coefficient model in predicting spring-summer cucumber ETc were 0.95,0.41 mm/d and 0.93,respectively,while the results of error analysis of predicting autumn-winter ETc were 0.91(R2),0.48mm/d(RMSE),and 0.90(Ens).Based on the modification of Dual Crop Coefficient model,the basal crop coefficient of each growing stage of cucumber for spring-summer season were adjusted as 0.17-0.25(the initial season stage),1.05-1.10(the middle season stage),0.33-0.68(the late season stage),and the corresponding values for autumn�

关 键 词：温室 蒸腾 叶面积指数 参考作物蒸发蒸腾量 双作物系数模型 茎流计 

分 类 号：TK519[动力工程及工程热物理—热能工程]