小麦秸秆生物炭对灰钙土农田土壤热物理性质的影响  

Effect of Wheat Straw Biochar on ThermalPhysial Properties of Sierozem Soil Farmland

作　　者：杨珂 赵保卫[1] 聂瑾 刘辉[1] YANG Ke;ZHAO Baowei;NIE Jin;LIU Hui(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学环境与市政工程学院,兰州730070

出　　处：《兰州交通大学学报》2024年第1期108-113,共6页Journal of Lanzhou Jiaotong University

基　　金：国家自然科学基金(51766008);兰州交通大学基础拔尖人才培养计划(2022JC10)。

摘　　要：以小麦秸秆生物炭与干燥农田灰钙土为研究对象,通过向灰钙土土壤中施加不同比例(1%、3%和5%)的生物炭,研究小麦秸秆生物炭的添加对灰钙土理化特性的影响以及生物炭在不同含水率下对灰钙土土壤热物理性质参数产生的影响。通过电位法测pH值、重铬酸钾容量法测土壤有机质、环刀法测土壤容重、GB/T 24203-2009规定的方法测孔隙率、热脉冲法测土壤热物理性质(体积热容量、导热率、热扩散率)。结果表明:生物炭施用量在1%、3%、5%时,与对照相比pH提高了0.32、0.43和0.14;土壤有机质质量分数提高了5.64、4.29和2.29 g·kg^(-1);土壤容重降低了0.22、0.19、0.17;孔隙率提高了11%、26%和29%。则生物炭的添加量与pH值、有机质、孔隙度均显著相关(P<0.01)且呈正相关,与容重相关(P<0.01)且呈负相关。在含水率对灰钙土土壤热物理性质参数的影响下,体积热容量与含水率呈线性正相关(R2>0.952 0,P<0.05),导热率与含水率之间则呈对数相关(R2>0.995 3,P<0.05),热扩散率则相反。研究结果可为解释生物炭对灰钙土土壤热物理性质的影响提供参考依据。With wheat straw biochar and dry farmland ash sierozem soil as the research object,by the different pro-portion of the soil(1%,3%and 5%),the influence of wheat straw biochar on the physical and chemical characteris-tics of ash calcium soil and the influence of biochar under different water content are studied.The pH value is meas-ured by potential method,soil organic matter is measured by potassium dichromate capacity method,soil volume density is measured by ring knife method,porosity is measured by the method specified in GB/T 24203-2009,and soil thermal physi-cal properties(volume heat capacity,thermal conductivity,thermal diffusivity)are measured by thermal pulse method.The results showed that when the Biochar is at 1%,3%and 5%respectively,the pH is improved by 0.32,0.43and 0.14,while the soil organic matter content is increased by 5.64,4.29and 2.29g·kg-1,the soil volume is increased by 0.22,0.19 and 0.17,and the porosity is increased by 11%,26%and 29%.Then,the amount of biochar added was significantly correlated with pH value,organic matter and porosity(P<0.01)and positively,and negatively correlated with ca-pactive density(P<0.01).Under the influence of water content on the thermal physical property parameters of si-erozem soil,the volume heat capacity and water content shows a linear positive correlation(R 2>0.9520,P<0.05),while the thermal conductivity and water content shows a logarithmic correlation(R 2>0.9953,P<0.05),and the thermal diffusivity is opposite.The results of this study provide a reference for explaining the effects of biochar on the thermophysical properties of sierozem soil.

关 键 词：生物炭 灰钙土 热容量 导热率 热扩散率 

分 类 号：X712[环境科学与工程—环境工程]