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Impact factors and dynamic simulation of tillage-layer temperature in frozen-thawed soil under different cover conditions

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International Journal of Agricultural and Biological Engineering 2018年第2期11卷 101-107页

作者： Qiang Fu Zi’ao Ma Enliang Wang Tianxiao Li Renjie Hou School of Water Conservancy and Civil Engineering Northeast Agricultural UniversityHarbin 150030China

Based on a winter field experiment between 2016 and 2017,four treatments(bare land(BL),natural snowfall coverage(NS),5-cm-deep straw+natural snowfall coverage(SC5),and 10-cm-deep straw+natural snowfall coverage(SC10))were established to determine the effects of the different treatments on soil temperature at the soil surface and at depths of 10 cm,20 cm,and 30 *** environmental factors of ambient temperature,ambient humidity,water vapor pressure,10-min wind speed,total radiation,net radiation,and long wave radiation were obtained from the weather station in the study *** correlation,multiple regression,and stepwise regression analysis,models for dynamic simulation of the tillage-layer soil temperature were constructed for analyzing the relation between tillage-layer soil temperature and environmental *** results showed that the environmental factors were all significantly correlated with tillage-layer temperature at the 0.01 level;when the impacts of other environmental factors were excluded,the correlations decreased *** dynamic simulation models for tillage-layer soil temperature under different coverage conditions were different,and the larger the coverage amount,the fewer the environmental factors that could affect the tillage-layer *** coefficients of determination of the prediction results of the dynamic models for the tillage-layer soil temperature under the four treatments(BL,NS,SC5,and SC10)were 0.8385,0.7110,0.7283,and 0.6216,*** prediction had a high accuracy and can accurately depict the dynamic changes of the tillage-layer soil *** results provided a theoretical basis for the efficient utilization of farmland soil water and heat resources.

关键词： farmland cover condition frozen-thawed soil tillage-layer temperature impact factor dynamic simulation stepwise regression

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