木质素对土壤结构和水分运移的影响  

Effects of lignin on soil structure and hydraulic properties

作　　者：雷震远 吴军虎[1] 白雪[1] 白伟 康靖东 LEI Zhenyuan;WU Junhu;BAI Xue;BAI Wei;KANG Jingdong(State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China,Xi'an University of Technology,710048,Xi'an,China)

机构地区：[1]西安理工大学省部共建西北旱区生态水利国家重点实验室,西安710048

出　　处：《中国水土保持科学》2025年第1期62-69,共8页Science of Soil and Water Conservation

基　　金：西北旱区生态水利工程国家重点实验室科研课题“黄土高原坡耕地水土养分流失特征与调控措施研究”(2016ZZKT-9);陕西省教育厅重点实验室科研计划项目“黄土坡耕地养分流失调控措施实验研究”(17JS096)。

摘　　要：黄土高原地区的土壤结构不稳定,保水能力差,严重制约了农业的发展。为解决这个问题,针对黄土区典型土壤,进行室内试验和模型模拟研究,以了解不同木质素施加量对土壤结构和水分运移的影响。结果表明:1)随着木质素施加量的增加,土壤的剪切力逐渐增大,同时土壤中超大团聚体(>2.000 mm)、大团聚体(2~>0.250 mm)和微团聚体(0.250~>0.053 mm)的质量分数逐渐增加,而黏粒(≤0.053 mm)的质量分数逐渐减小;2)随着木质素施加量的增加,累积入渗量、入渗率以及湿润锋运移距离显著减小,HYDRUS模型的湿润锋和入渗率模拟值与实测值结果较为接近。施加木质素能够改善土壤结构,增强土壤的保水能力,从而提高黄土高原地区的土地生产力。[Background]The Loess Plateau is one of the regions globally afflicted by severe soil erosion.The inherent instability of its soil structure and limited water retention capacity significantly impede local agricultural development.Lignin,as a widely employed soil conditioner,plays a crucial role in addressing this issue.[Methods]Laboratory tests and model simulation were conducted to investigate the effects of lignin application on soil structure and water transport in typical soils in loess areas.The samples were taken from Changwu Experimental Station,Institute of Water Conservation,Chinese Academy of Sciences.The application ratios of lignin were set to be 0,0.2%,0.3%,0.4%and 0.5%.The influences of different lignin application amounts on each index were studied by measuring soil shear force,soil aggregate and one-dimensional vertical infiltration test.The average value of 3 repeated tests was taken as the final result of the test data.[Results]1)Adding lignin in soil improved the stability of soil structure.The soil shear strengths of all treatment groups increased significantly with the increased of lignin application amount,and the soil shear strengths of all treatment groups increased by 13.6%,18.2%,31.8%and 50.0%compared with CK control group,respectively.Lignin significantly increased the mass fraction of super-large aggregates(>2 mm),large aggregates(0.25-<2 mm)and micro-aggregates(0.053-<0.25 mm)in soil,and reduced the mass fraction of clay particles(≤0.053 mm).Compared with CK control group,with the increase of lignin application ratio,lignin reduced the mass fraction of clay particles(≤0.053 mm).The super-large aggregates of>2.000 mm increased by 26.7%,33.3%,106.7%and 133.3%,respectively.The aggregate size of 2.000->0.250 mm increased by 13.3%,18.3%,26.3%and 40.0%,respectively.The microaggregates of 0.250->0.053 mm increased by 26.7%,48.5%,78.2%and 83.2%,respectively.The clay particles≤0.053 mm decreased by 15.2%,42.8%,41.5%and 47.5%,respectively.The fractal dimension was negatively correlated wi

关 键 词：木质素 土壤结构 团聚体 入渗 

分 类 号：S157[农业科学—土壤学]