基于CT技术的甘蔗地不同耕作措施下土壤孔隙结构研究

发布时间：2018-04-09 06:02

本文选题：CT技术　切入点：土壤孔隙结构　出处：《西南农业学报》2017年08期

【摘要】：【目的】开展不同耕作措施下土壤孔隙结构研究,为土地合理耕作及耕地水土保持提供参考。【方法】以广西甘蔗地为研究对象,在常规耕作和三年免耕条件下,利用CT(Computed tomography)扫描技术,通过相关插件计算获得甘蔗地土壤孔隙数量、孔隙体积和表面积,土壤弯曲度、孔隙连通性和水力半径等孔隙结构,并进行三维重建和可视化。【结果】耕作区的孔隙面密度大于免耕作区;耕作区的孔隙度均值(1.069%)和孔隙数均值(1194个)都小于免耕区的孔隙度均值(1.195%)和孔隙数均值(1519个);由弯曲度和连通性的均值数据可知,耕作区(1.374、0.512)大于免耕作区(1.333、0.299)。翻耕破坏土壤原有结构,导致土壤中的大孔隙数量和孔隙度减少,但增加中小孔隙的数量。使得在二维分布中耕作区的孔隙面密度大于免耕区,而在土壤表层三维形态特征中免耕区土壤孔隙较耕作区分布更密集;翻耕破除了土壤孔隙之间的孤立性,增加了土壤的连通性,使得耕作区的弯曲度、连通性大于免耕区。【结论】适当耕作比免耕有助于土壤内部的连通和导水,促进作物吸水以减少土壤水分流失。
[Abstract]:[objective] to study the soil pore structure under different tillage measures in order to provide a reference for rational tillage and soil and water conservation of cultivated land. [methods] taking sugarcane field in Guangxi as the research object, under the condition of conventional tillage and no-tillage for three years,By using CT(Computed tomographic scanning technique, the pore structure, such as soil pore quantity, pore volume and surface area, soil curvature, pore connectivity and hydraulic radius, were calculated by relevant plug-in.The density of pore surface in tillage area was higher than that in no-tillage area.The mean values of porosity and porosity in tillage area were less than that in no-tillage area (1.195) and the mean of porosity (1519), and the mean values of curvature and connectivity were higher than that of no-tillage area (1.3330.2990.3330.299), according to the mean value data of curvature and connectivity, the average value of porosity (1.069) and pore number (1194) were smaller than that of no-tillage area (1.195) and the mean value of porosity (1519) was higher than that in no-tillage area.Ploughing destroys the original structure of soil, resulting in the decrease of macroporosity and porosity, but the increase of the number of small and medium pores.The pore surface density of tillage area is larger than that of no-tillage area in two-dimensional distribution, and the soil pore density in no-tillage area is more dense than that in tillage area in the three-dimensional morphological characteristics of soil surface, and the isolation between soil pores is broken by tillage.The connectivity of soil was increased, and the curvature and connectivity of tillage area was higher than that of no-tillage area. [conclusion] proper tillage is more helpful than no-tillage to improve soil connectivity and water conductivity, promote crop water absorption to reduce soil water loss.
【作者单位】：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;桂林理工大学广西环境污染控制理论与技术重点实验室;桂林理工大学环境科学与工程学院;广西农业科学院农业资源与环境研究所;广西农业科学院微生物研究所;
【基金】：国家自然科学基金项目(41501230,31360356) 广西自然科学基金项目(2016GXNSFAA380197) 广西农业科学院基本科研业务专项项目(2015JZ34)
【分类号】：S152.5;S566.1

【相似文献】