桂林地区轮作与非轮作条件下水稻土收缩变化研究
【目的】研究不同耕作条件下水稻田土壤收缩变化,为防治土壤收缩产生裂隙以及水稻安全生长提供理论依据及指导。【方法】以水稻田为研究对象,在轮作与非轮作条件下,利用van-Genuchten修改方程得到的土壤收缩曲线模型对不同土壤含水量条件下的水稻田原状土壤进行土壤线性伸展系数变化和土壤收缩曲线拟合的研究。【结果】土壤收缩特征曲线拟合值和原状土壤样品实测值拟合度高（R~2〉0.97）;在轮作条件下,土壤黏粒含量大于非轮作,而土壤孔隙度却与之相反;轮作与非轮作条件下,土壤线性伸展系数都随土层深度的增加而减小,0~8 cm土层和18~26 cm土层土壤收缩曲线呈现＂S＂型,在40~46 cm土层非轮作区...
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| Published in | 西南农业学报 Vol. 31; no. 2; pp. 270 - 275 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
桂林理工大学,环境科学与工程学院,广西桂林541004%桂林理工大学,环境科学与工程学院,广西桂林541004%桂林理工大学,广西环境污染控制理论与技术重点实验室,广西桂林541004
2018
桂林理工大学,广西环境污染控制理论与技术重点实验室,广西桂林541004 桂林理工大学,广西岩溶地区水污染控制与用水安全保障协同创新中心,广西桂林541004 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1001-4829 |
| DOI | 10.16213/j.cnki.scjas.2018.2.009 |
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| Summary: | 【目的】研究不同耕作条件下水稻田土壤收缩变化,为防治土壤收缩产生裂隙以及水稻安全生长提供理论依据及指导。【方法】以水稻田为研究对象,在轮作与非轮作条件下,利用van-Genuchten修改方程得到的土壤收缩曲线模型对不同土壤含水量条件下的水稻田原状土壤进行土壤线性伸展系数变化和土壤收缩曲线拟合的研究。【结果】土壤收缩特征曲线拟合值和原状土壤样品实测值拟合度高（R~2〉0.97）;在轮作条件下,土壤黏粒含量大于非轮作,而土壤孔隙度却与之相反;轮作与非轮作条件下,土壤线性伸展系数都随土层深度的增加而减小,0~8 cm土层和18~26 cm土层土壤收缩曲线呈现＂S＂型,在40~46 cm土层非轮作区土壤收缩曲线呈现线性关系;不同含水量条件下,土壤收缩能力不同,土壤含水量越大土壤收缩越明显,两者呈正相关关系。【结论】相较于非轮作条件下,轮作可以有效的改善土壤理化性质,调节土壤结构,增强土壤收缩能力。 |
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| Bibliography: | 51-1213/S Rotation and non-rotation ; Soil shrinkage ; Linear extension ; Shrinkage curve Objective】To provide theoretical basis for soil shrinkage cracks and theoretical guidance for the safe growth of rice,the soil shrinkage changes in paddy fields under different tillage conditions were studied.【Method】The paddy fields were studied under the conditions of rotation and non-rotation. Under the different soil moisture contents,the soil shrinkage curve model modified by van-Genuchten equation was used to study the variation of soil linear extension coefficient and the fitting of soil shrinkage curve in paddy fields.【Result】The SSS software could fit the measured data well（ R~2 0. 97）; under the rotation condition,the soil clay content was greater than non-rotation,but soil porosity was opposite; The linear extension coefficient of soil decreased with the increase of soil depth,the soil shrinkage curves in the 0-8 cm soil layer and 18-26 cm soil layer showed‘S＇type in the rotation area,however,it showed a linear |
| ISSN: | 1001-4829 |
| DOI: | 10.16213/j.cnki.scjas.2018.2.009 |