Influence of Biochar on Soil Thermal Properties in Northern Cold Regions

被引：0
|
作者：
Ma X. [1 ]
Fu Q. [1 ,2 ]
Xu S. [1 ,2 ]
Li T. [1 ]
Hou R. [1 ]
Yu X. [1 ]
机构：
[1] School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin
[2] Key Laboratory of High Efficiency Use of Agricultural Water Resources, Ministry of Agriculture and Rural Affairs, Northeast Agricultural University, Harbin
来源：
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | 2019年 / 50卷 / 10期
关键词：
Biochar; Northern cold region; Soil thermal capacity; Soil thermal conductivity; Soil thermal diffusivity;
D O I：
10.6041/j.issn.1000-1298.2019.10.034
中图分类号：
学科分类号：
摘要：
In order to reveal the influence of biochar on soil thermal properties, the farmland soils with different biochar contents were studied in northern cold regions. Soil moisture levels were set at 0%, 8%, 16%, 24%, 32% and 40%, respectively. The variation characteristics of soil thermal conductivity, thermal diffusivity and thermal capacity within the temperature range of 15~-15℃ were measured by ISOMET2114, and the response mechanism of soil thermal characteristic parameters to soil hydrothermal regime was investigated with different biochar contents. Results showed that with the increase of soil moisture, the soil thermal properties had increasing trend while freezing and non-freezing. Under the condition of 3℃ and biochar content of 0 t/hm2, the soil thermal conductivity was increased by 0.141 4 W/(m•K) and 0.580 5 W/(m•K), respectively, with the soil moisture content at 24% and 32%, compared with that at 16%. With the increase of biochar, the soil thermal conductivity and thermal diffusivity were decreased, and the thermal capacity was decreased while non-freezing and increased while freezing. Under the condition of -3℃ and moisture content of 32%, the soil thermal capacity was increased by 0.16 J/(cm3•K) and 0.20 J/(cm3•K), respectively, with the biochar content of 4 t/hm2 and 6 t/hm2, compared with that of 0 t/hm2. There was a logarithmic relationship between soil thermal conductivity and moisture content, a linear relationship between thermal capacity and moisture content, and a quadratic relationship between thermal diffusivity and moisture content. The effects of biochar on thermal properties of frozen and non-frozen soils were studied with different soil moisture contents, and the influence of biochar on the thermal properties of frozen soils was firstly analyzed using freezing characteristic curve, which provided theoretical basis for accurately describing the soil thermal condition and applying biochar to improve the soil in northern cold region. © 2019, Chinese Society of Agricultural Machinery. All right reserved.
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页码：298 / 305
页数：7
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共 30 条
  • [1] Li Y., Shao M., Wang W., Et al., Influence of soil textures on the thermal properties, Transactions of the CSAE, 19, 4, pp. 62-65, (2003)
  • [2] Kurz D., Alfaro M., Graham J., Et al., Thermal conductivities of frozen and unfrozen soils at three project sites in northern Manitoba, Cold Regions Science and Technology, 140, pp. 38-40, (2017)
  • [3] Su L., Wang Q., Wang S., Et al., Soil thermal conductivity model based on soil physical basic parameters, Transactions of the CSAE, 32, 2, pp. 127-133, (2016)
  • [4] Abu-Hamdeh N.H., Thermal properties of soils as affected by density and water content, Biosystems Engineering, 86, 1, pp. 97-102, (2003)
  • [5] Kim D., Kim G., Beak H., Et al., Relationship between thermal conductivity and soil-water characteristic curve of pure bentonite-based grout, International Journal of Heat and Mass Transfer, 84, pp. 1049-1055, (2015)
  • [6] Mengistu A.G., Van Rensburg L.D., Mavimbela S.S.W., Et al., The effect of soil water and temperature on thermal properties of two soils developed from aeolian sands in South Africa, CATENA, 158, pp. 184-193, (2017)
  • [7] Wang T., Zhou G., Jiang X., Et al., Assessment for the spatial variation characteristics of uncertain thermal parameters for warm frozen soil, Applied Thermal Engineering, 134, pp. 484-498, (2018)
  • [8] Orakoglu M.E., Liu J., Niu F., Et al., Experimental and modeling investigation of the thermal conductivity of fiber-reinforced soil subjected to freeze-thaw cycles, Applied Thermal Engineering, 108, pp. 824-832, (2016)
  • [9] Hu G., Zhao L., Wu X., Et al., Comparison of the thermal conductivity parameterizations for a freeze-thaw algorithm with a multi-layered soil in permafrost regions, CATENA, 156, pp. 244-251, (2017)
  • [10] Gori F., Corasaniti S., New model to evaluate the effective thermal conductivity of three-phase soils, International Communications in Heat and Mass Transfer, 47, pp. 1-6, (2013)
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