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基于SHAW模型的冬小麥葉溫模擬
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Simulation of Winter Wheat Leaf Temperature Based on SHAW Model
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    葉溫是反映冬小麥健康狀況的關(guān)鍵指標(biāo),但獲取麥田葉溫動(dòng)態(tài)變化過(guò)程及廓線分布存在著較大困難。本文以河南省商丘市為研究區(qū),引入表達(dá)土壤-植被-大氣能量傳輸?shù)腟HAW模型,對(duì)其進(jìn)行本地化標(biāo)定,在垂直方向上0~60cm高度以10cm為間隔進(jìn)行分層,模擬冬小麥拔節(jié)期至抽穗期間的葉溫時(shí)序曲線及廓線,并結(jié)合田間同期不同高度的葉溫實(shí)測(cè)數(shù)據(jù),對(duì)模擬結(jié)果進(jìn)行分析。結(jié)果表明:SHAW模型可有效地用于麥田葉溫時(shí)序曲線和廓線模擬,決定系數(shù)達(dá)0.8476,夜間模擬效果顯著優(yōu)于白天,決定系數(shù)分別為0.8622和0.7602。對(duì)葉溫日平均值、最低值和最高值的分析表明,均方根誤差范圍為1.36~4.09℃,且最低溫模擬效果最好,平均值次之,最高溫誤差最大。葉溫廓線模擬分析表明,各高度決定系數(shù)均達(dá)到0.82以上,且隨高度的增加而增大,均方根誤差范圍為2.41~3.35℃,平均誤差均小于0℃;葉溫總體上呈現(xiàn)出夜間隨高度增加而降低的趨勢(shì),而白天隨高度增加而升高的趨勢(shì)。

    Abstract:

    Leaf temperature is the key factor that reflects the growth conditions of winter wheat, but it is difficult to obtain the dynamic variation and profile distribution of wheat field leaf temperature. The simultaneous heat and water (SHAW) model describes heat and water movement in a plant-snow-residue-soil system in detail.Taking Shangqiu as the study area, based on the localization,the SHAW model was used to simulate the leaf temperature time series curve and profile from 0cm to 60cm separated by 10cm from jointing period to heading period of winter wheat.The simulation results were analyzed by combining with field observed data at the same time. The results showed that the SHAW model can be used effectively to simulate leaf temperature time series curve and profile, and the coefficient of determination reached to 0.8476. The night simulation results were significantly better than the daytime,and the coefficient of determination were 0.8622 and 0.7602 respectively. The analysis of the average, minimum and maximum values of leaf temperature simulation showed that RMSE ranged from 1.36℃ to 4.09℃. The minimum temperature simulation effect was the best, and the average value was second, and the maximum temperature error was the greatest. The analysis of the leaf temperature profile showed that height decision coefficient all achieved above 0.82, and increased with the height. RMSE was ranged from 2.41℃ to 3.35℃, and MBE were all less than 0℃. The leaf temperature generally showed a tendency to decrease with the height in the night, while increase with the height during the day.

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劉峻明,崔珍珍,潘佩珠,王鵬新,胡新.基于SHAW模型的冬小麥葉溫模擬[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2017,48(s1):110-117. LIU Junming, CUI Zhenzhen, PAN Peizhu, WANG Pengxin, HU Xin. Simulation of Winter Wheat Leaf Temperature Based on SHAW Model[J]. Transactions of the Chinese Society for Agricultural Machinery,2017,48(s1):110-117.

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  • 收稿日期:2017-07-10
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  • 在線發(fā)布日期: 2017-12-10
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