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在一块66×100 m_2的平坦试验地中按10×10 m分格测定土壤湿度的分布表明,其表层(0—45 cm)是正态分布的。心土(45—90 cm)湿度呈非正态分布,可能与其中有一层持水性较高但厚薄不一的粘土层有关。表层取样4个时,其平均值的误差估值为0.024(g/g)。半方差分析表明,土壤湿度的空间分布是有结构的,其相关域约30 m。这种结构是稳定的,其稳定性亦为秩相关分析所证明。为了使样本符合独立原则,取样点之间的距离应≥相关域。在这个前提下,选定监测点的土壤湿度愈接近总体平均值,其误差可望愈小。
The distribution of soil moisture in a flat field of 66 × 100 m 2 at 10 × 10 m divisions showed that the surface layer (0-45 cm) was normally distributed. Soil (45-90 cm) Humidity is non-normal and may be related to a layer of clay with a high water-holding but varying thickness. When the surface sampling 4, the average error is estimated as 0.024 (g / g). Semi-ANOVA analysis showed that the spatial distribution of soil moisture is structural and its correlation domain is about 30 m. This structure is stable and its stability is also demonstrated by rank correlation analysis. In order to conform the samples to the independent principle, the distance between sampling points should be ≥ the relevant domain. Under this premise, the closer the soil moisture of the selected monitoring points to the overall average, the smaller the error is expected to be.