论文部分内容阅读
在84 m2区域内对橡胶园土壤按0.5 m×1 m网格进行取样(n=168),对5种土壤肥力指标进行地统计学分析。结果表明:全氮、有效磷、速效钾、有机质和pH值的半方差函数均可用指数模型描述,其各自变程分别为1.44、1.65、3.36、1.20和1.74 m,均表现出强空间自相关关系。从土壤肥力指标的空间分布特征来看,全氮、有效磷、有机质呈现出明显的“肥岛”效应,其中全氮“肥岛”面积最大,影响距离最远;有效磷的“肥岛”面积最小,与周围浓度成倍数递减,成同心圆结构;有机质的空间分布特征介于二者之间;速效钾斑块面积分布比较均匀,与土壤母质类型有关。
Rubber garden soils were sampled in a grid of 0.5 m × 1 m (n = 168) in an area of 84 m2. Geostatistical analysis was conducted on five soil fertility indicators. The results showed that the semivariance functions of total nitrogen, available phosphorus, available potassium, organic matter and pH could be described by exponential model with the respective ranges of 1.44, 1.65, 3.36, 1.20 and 1.74 m, respectively, showing strong spatial autocorrelation relationship. In terms of the spatial distribution of soil fertility index, total nitrogen, available phosphorus and organic matter showed obvious “fat island” effect, of which total nitrogen and “fat island” had the largest area and affected the longest distance; The area of “fat island” is the smallest and decreases exponentially with the surrounding concentration, forming a concentric circle structure. The spatial distribution of organic matter is in between. The area of available potassium patch is relatively uniform and is related to the type of soil parent material.