摘要
红壤黏性重,干湿交替容易结块和形成裂隙,通过土-水特征曲线研究重构红壤的持水保水能力具有一定的意义。为探明干湿交替下木纤维重构对红壤水力特性的影响,该研究应用4种添加量(0、0.5%、2.5%和5.0%)的木纤维重构红壤,采用滤纸法测定木纤维复合土的基质吸力,并利用Logistic模型拟合其土-水特征曲线。结果表明,随着木纤维添加量的增加,干湿交替作用对红壤基质吸力降幅和土-水特征曲线的滞后现象逐渐减缓,2.5%木纤维复合土是提高土壤持水能力最优配比;木纤维添加提高红壤进气值和残余值,干湿交替下残余值变化较大,随着干湿交替次数增加而残余值的降幅逐渐较小,2.5%木纤维复合土的斜率受干湿交替影响较小,其持水能力最优,体积含水率变化速率减小;添加木纤维后土-水特征曲线的决定系数均在0.97,说明Logistic模型适用于拟合木纤维重构的红壤土-水特征曲线。研究对于深入研究红壤区的土壤重构、边坡防护和生态恢复等具有重要的理论和工程实践意义。
Red soil is one of the most widely distributed soil types in Yunnan Province of China.Red soil is characterized by high plasticity,high void ratio,heavy viscosity,slightly acidic soil,as well as low water and fertility retention.Among them,alternate wetting and drying can be caused by rainfall,irrigation,high-temperature evaporation,and disturbances in production and construction projects,leading to the shrinkage,cracking,and swelling of red soil during drought.Soil water characteristics change dramatically,which is essential to carry out soil improvement in red soil regions.Soil reconstruction has been widely used in the practice of red soil improvement.Most research focuses mainly on the hydraulic properties of the natural red soil,rather than the reconstructed one.Furthermore,the wood fiber can be expected to serve as an ecological soil conditioner,in order to improve the ecological restoration,of the soil,and water conservation in the mining areas.However,it is still lacking on the effects of wood fiber additions on the physical properties of red soil in the combination of dry and wet alternation and wood fiber.In this study,a novel mechanism was proposed to clarify the impact of wood fiber reconstruction on the hydraulic properties of red soil during dry and wet alternation.The red soil was collected in Kunming City of Yunnan Province in China.Four types of wood fiber additions(0,0.5%,2.5%,and 5.0%)were used to improve the red soil.The matric suction of wood fiber composite soil was measured using filtering,and the soil-water characteristic curve(SWCC)was fitted using the Logistic model.The results showed that there was a gradually slow hysteresis in the dry-wet alternation on the decrease in the soil matric suction and SWCC of red soil,as the addition of wood fiber increased.Specifically,2.5%wood fiber composite soil was the optimal ratio to improve soil water holding.The addition of wood fiber increased the intake and residual value of red soil.The residual value changed greatly under dry and wet alternati
作者
张川
张玉锴
李淑芳
王楚燕
普建丹
刘武江
谢祥荣
段青松
李效顺
ZHANG Chuan;ZHANG Yukai;LI Shufang;WANG Chuyan;PU Jiandan;LIU Wujiang;XIE Xiangrong;DUAN Qingsong;LI Xiaoshun(Research Center for Transition Development and Rural Revitalization of Resource-based Cities in China,China University of Mining and Technology,Xuzhou 221116,China;College of Hydraulic Engineering,Yunnan Agricultural University,Kunming 650201,China;Yunnan Field Scientific Observation Station of Land Use in Mountain Basin of the Ministry of Natural Resources,Kunming 650201,China;Yunnan Academy of Agricultural Engineering,Kunming 650215,China)
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2023年第8期103-110,共8页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金项目(32160304)
自然资源部“西南多样性区域土地优化配置与生态整治科技创新团队”开放基金项目(YNTD2018KF05)
云南省科技厅计划项目青年项目(2019FD094)
云南省水利厅水利科技项目(2023BG204001)。
关键词
土壤
干湿交替
木纤维
红壤
土壤重构
基质吸力
土-水特征曲线
soils
dry-wet alternation
wood fiber
red soil
soil reconstruction
matric suction
soil-water characteristic curve
