天然牧草下铬haplustert抗穿透性的空间变异性

Juan Alejandro Villazón Gómez, G. Martín Gutiérrez, Yakelín Cobo Vidal, Ramón Candelario Núñez Tablada, Roberto Alejandro García Reyes
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摘要

土壤抗渗透能力是确定土壤压实度的一种方法,确定其空间变异性对于合理管理土壤压实度具有重要意义。本研究的目的是评价天然草种下铬酸根抗渗透能力的空间变异性。选择面积1.08 ha,属Holguín省甘蔗研究站,季节性放养,强度低。它被划分为8个30 × 45米(0.135公顷)的矩形。采用简单随机抽样的方法,选取1个点,选取距离5 m的70个点进行抽样。采用IAA/Planalsucar-Stolf冲击贯深仪测定土壤抗侵透性。评估深度分别为0-10、10-20和20-30 cm。10 ~ 20 cm土层土壤抗渗透能力最强。采用球形和指数模型对实验半方差进行了调整,在三个深度的相似采样距离具有独立的半方差,其中穿透阻力值表现出较强至中等的空间依赖性。土壤抗渗透能力在20 ~ 30 cm深度空间变异最小。土壤对渗透的抵抗力最低的地方是与盐斑重合的地方。在盐渍秃地的边缘观察到最高的土壤抗渗透能力,从那里一个压实的土壤舌将这个区域与高土壤抗渗透能力的地点分开。
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Variabilidad espacial de la resistencia a la penetración en un haplustert crómico bajo pasto natural
Soil resistance to penetration is a way to determine soil compaction and it is important to determine its spatial variability to be able to properly manage this resource. The work was carried out with the objective of evaluating the spatial variability of the resistance to penetration in a Chromic Haplustert under natural grass. An area of 1.08 ha was chosen, with extensive seasonal grazing of low intensity, belonging to the Provincial Research Station of Sugarcane of Holguín. It was divided into 8 rectangles of 30x45 m (0.135 ha). By simple random sampling, one was chosen, in which 70 points with 5 m distance were sampled. For the determination of the soil resistance to penetration, an IAA/Planalsucar-Stolf impact penetrometer was used. The evaluation was performed at depths of 0-10, 10-20 and 20-30 cm. The highest soil resistance to penetration was found in the 10-20 cm layer. The experimental semivariograms were adjusted with spherical and exponential models, with an independent semivariance of the similar sampling distance in the three depths, in which the penetration resistance values show a strong to moderate spatial dependence. The soil resistance to penetration showed the lowest spatial variability in the depth of 20-30 cm. The lowest soil resistance to penetration was found where the points coincided with a saline plaque. The highest soil resistance to penetration was observed at the edges of the saline bald, from where a compacted soil tongue separates this area with sites of high soil resistance to penetration.
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