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当前位置: 首页 > 文章 > 覆盖物对冻融土壤热量空间分布与传递效率的影响 农业机械学报 2018 (2) 292-298
Position: Home > Articles > Influence of Different Covers on Heat Spatial Distribution and Transfer Efficiency of Freezing-thawing Soil Transactions of the Chinese Society for Agricultural Machinery 2018 (2) 292-298

覆盖物对冻融土壤热量空间分布与传递效率的影响

作  者：
付强;马梓奡;李天霄;侯仁杰
关键词：
覆盖物;冻融土壤;热量;空间分布;传递效率
摘  要：
为了明确覆盖物对冻融土壤热量传递阻碍作用的机理和特性,基于冬季大田试验(2016年11月1日—2017年4月30日),设置裸地、自然降雪覆盖、5 cm秸秆覆盖+自然降雪、10 cm秸秆覆盖+自然降雪4种处理,分别测定了不同处理条件下10、20、30、40、50、60、70、80、90、100 cm深度的土壤总含水率、液态含水率和温度等数据,计算了不同处理条件下冻融土壤的热容量、相变热量和热量变化量等相关参数,进而分析了覆盖物对冻融土壤热量空间分布和传递效率的影响。结果表明:试验期30 cm深度范围内土壤热量交换量占比较大,不同时期内热量变化占比可达54.57%~81.17%;在冻结期4种处理条件下,土壤热量传递整体呈现出热量散失的趋势,在融化期4种处理条件下,土壤热量传递整体呈现出热量吸收的趋势;自然降雪覆盖、5 cm秸秆覆盖和10 cm秸秆覆盖对于热量传递的影响率分别为17%、8%和17%;4种处理条件下土壤热量无变化时间段均较长,分别为29.17%、39.41%、43.33%、50.88%。
译  名：
Influence of Different Covers on Heat Spatial Distribution and Transfer Efficiency of Freezing-thawing Soil
作  者：
FU Qiang;MA Ziao;LI Tianxiao;HOU Renjie;School of Water Conservancy and Civil Engineering,Northeast Agricultural University;
关键词：
mulching;;freezing-thawing soil;;heat;;spatial distribution;;transfer efficiency
摘  要：
Soil mulch is one of the important agricultural measures,in order to inquiry the mechanism and characteristics of the mulching hindrance effect on heat exchange between atmosphere and soil. There were four treatments of bare land,natural snowfall mulching,5 cm straw with natural snow fall mulching and 10 cm straw with natural snow mulching in winter field trial period( 2016. 11. 1—2017. 4. 30),the total soil water content,liquid water content and temperature at the soil depths of 10 cm,20 cm,30 cm,40 cm,50 cm,60 cm,70 cm,80 cm,90 cm and 100 cm under the four treatments were determined,the heat capacity,phase change heat and heat quantity of freezing-thawing soil were calculated,and then the effects of different mulching treatments on heat spatial distribution and transfer efficiency in freezingthawing soil were analyzed. The result showed that the depth of 30 cm soil heat exchange was accounted for relatively large,the heat quantity was accounted for up to 54. 57% ~ 81. 17% in different trial periods. In the freezing period,the soil heat transfers of four treatments showed the heat dissipation overall trend,and in the thawing period,the soil heat transfers of four treatments showed the heat absorption overall trend. The effects of the natural snowfall mulching,straw mulching of 5 cm and 10 cm on the heat transfer rate were 17%,8% and 17%,respectively. The time periods of no soil heat change were long with proportions of 29. 17%,39. 41%,43. 33% and 50. 88%,respectively under different treatments. The study had practical significance for the spring soil moisture conservation.

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