玉米秸秆生物炭对灰钙土热物理性质的影响  

Effects of Corn Straw Biochar on the Thermophysical Properties of Sierozem Soil

作　　者：潘江龙 赵保卫[1] 杨哲 刘辉[1] PAN Jiang-long;ZHAO Bao-wei;YANG Zhe(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou,Gansu 730070)

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070

出　　处：《安徽农业科学》2024年第20期65-69,73,共6页Journal of Anhui Agricultural Sciences

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

摘　　要：为了研究玉米秸秆生物炭的施加对灰钙土热物理性质的影响,将质量比为0、1%、3%和5%的生物炭分别添加到干燥好备用的100 g灰钙土中,分析不同施加量的玉米秸秆生物炭对灰钙土理化性质、热物理性质的影响。结果表明:玉米秸秆生物炭能够有效提高灰钙土的pH、有机质含量、孔隙率、持水性能及阳离子交换量,降低土壤容重,从而使灰钙土肥力增强;生物炭施加量越高,灰钙土的理化性质改善效果越佳。玉米秸秆生物炭能够影响土壤热物理性质,土壤的热容量、导热率、热扩散率随生物炭施加量的增加整体呈下降趋势。灰钙土热物理性质与土壤含水量密切相关,在所有拟合中,仅BC500的热扩散率与含水量拟合效应不显著(R^(2)<0.95),其他参数与土壤含水量拟合效应均显著(R^(2)≥0.95)。灰钙土的热容量、导热率、热扩散率与生物炭施加量呈显著或极显著负相关,与土壤容重呈显著正相关,与土壤含水量呈极显著正相关。In order to study the effect of the application of corn straw biochar on the thermophysical properties of sierozem soil,the corn straw biochar with mass ratio of 0,1%,3%and 5%were added to 100 g dried sierozem soil,and the effects of different applied amounts of corn stalk biochar on the physicochemical and thermophysical properties of sierozem soil were analyzed.The results showed that corn straw biochar could effectively improve the pH,organic matter content,porosity,water holding performance and cation exchange amount of sierozem soil,reduce soil bulk density,and thus enhance the fertility of sierozem soil;the higher the biochar application amount,the better the physicochemical properties of sierozem soil.Corn straw biochar could affect the thermophysical properties of soil,the heat capacity,thermal conductivity and thermal diffusivity of soil will decrease with the increase of biochar application.The thermophysical properties of sierozem soil were closely related to soil water content.In this study,besides the thermal diffusivity of BC500 was not significant(R^(2)<0.95),and the others were significantly correlated with soil water content(R^(2)≥0.95).The thermal capacity,thermal conductivity and thermal diffusivity of calcareous soil were significantly or extremely significantly negatively correlated with biochar application,significantly positively correlated with soil bulk density,and extremely significantly positively correlated with soil water content.

关 键 词：生物炭 玉米秸秆 灰钙土 热容量 导热率 热扩散率 

分 类 号：S-3[农业科学]