摘要
运用经典统计学和地统计学理论,研究了缙云山马尾松林地土壤水分、电导率和pH值的空间变异性。结果表明,各变量符合正态分布,电导率与pH值呈正相关关系(α=0.01)。行内变异性分析表明,各变量沿坡向各行变异系数的均值都大于垂直于坡向的均值。不同坡向对行间的差异分析表明,含水量在沿坡向和垂直于坡向上均无显著差异,在垂直于坡向上各行电导率和pH值存在显著差异(α=0.01)。地统计学分析结果显示,含水量在沿坡向和垂直于坡向上的变异具有漂移特征,电导率在垂直于坡向方向上具有空间结构性,在沿坡向上随机变异过大,不能体现出空间自相关的特点;pH值在垂直于坡向上具有漂移特征,沿坡向上为纯块金效应。典型植被下土壤水分入渗研究表明,农耕地和阔叶林稳渗率为4.81mm/min和3.15 mm/min,分别是针叶林的14倍和9倍;1 h入渗总量分别为1365.58 mm和518.46 mm,是针叶林的37倍和14倍。
For the sustainable development and ecological construction in the Jinyun Mountain, it is important to describe the spatial variability of soil properties on slope woodland and infiltration processes for different vegetation types. Soil moisture, electrical conductivity and pH for 80 soil samples were measured, and the spatial variability was studied on the grids of 2 m×2 m. Results showed that data of each variable fitted normal distribution, and there is a significant correlation between electrical conductivity and pH （α= 0.01 ）. The mean of Cv% for each variable along the longitudinal slope was greater than that on the horizontal one. Soil moisture within different rows in both longitudinal and horizontal slope directions was not significantly influenced, whereas electrical conductivity and pH in the longitudinal slope direction were significantly influenced （ α= 0.01 ）. The data were then analyzed using theory of geostatistics. It was found that soil moisture had a floating feature in both slope directions, and pH not only had the floating feature in the horizontal direction, but also showed the pure nugget effect in the longitudinal direction. Electrical conductivity showed a spatial structure in the horizontal direction, but did not have spatial relativity for the larger stochastic variability. The experiments on infiltration process in five standard lands demonstrated that steady-state infiltration rates in cultivated land and broad-leaved forest were 4.81 mm/min and 3.15 mm/min, respectively, and were 14 times and 9 times higher than that in coniferous-leaved forest, respectively. The amounts of lh cumulated infiltration in cultivated land and broad-leaved forest were 1 365.58 mm and 518.46 mm, respectively, and were 37 times and 14 times higher than that in coniferous-leaved forest, respectively.
出处
《水土保持通报》
CSCD
北大核心
2007年第1期15-19,共5页
Bulletin of Soil and Water Conservation
基金
国家973项目(2002CB11502)
自然基金项目(40471078)
关键词
马尾松林
空间变异
半方差
入渗过程
Pinus massoniana forest
spatial variability
semi-variogram
infiltration process
