摘要
土壤属性的空间变异性是土壤的重要性质之一。在平坦区黑土田块尺度上利用环刀取样测定20 cm^140 cm土层土壤的密度、孔隙度、田间持水量和饱和含水量,利用描述性统计的方法分析土壤物质性质的空间异质性。结果表明,土壤密度、孔隙度、田间持水量和饱和含水量在垂直方向上的变异系数均小于10%,属于弱度变异。除了20 cm^40 cm田间持水量在水平方向上的变异系数属于中度变异以外,密度、孔隙度、田间持水量和饱和含水量在黑土剖面20 cm^140 cm内的水平方向上的变异均属于弱度变异。因此,在平坦黑土区的田块尺度上剖面土壤物理性质具有比较大的稳定性,可以为做空间变异研究分析的采样工作提供一些参考。
The spatial variability of soil property is one of the important soil features. Soil bulk density,porosity,field water content and saturation water content were tested on samples collected from a flat arable black soil region in field scale,and description statistics was used to analyze the spatial variability of the selected soil physical properties. The results showed that the variation coefficient of soil bulk density,porosity,field water content and saturation water content in the vertical direction of the soil profile were less than 10%,suggesting that these properties were in weak variability. In addition,selected soil physical properties had weak variability in horizontal direction in the 20 cm ~ 140 cm layer,with an exception of field water content which showed moderate variability in the 20 cm ~ 40 cm layer. Thus in the field scale,soil physical properties were relative stable in the flat black soil region,which would be helpful for soil sampling in the investigating spatial variability of soil physical properties.
出处
《土壤与作物》
2013年第3期127-131,共5页
Soils and Crops
基金
国家自然科学基金(41101208)
国家重点基础研究发展计划(2011CB100506)
关键词
土壤物理性质
田块尺度
空间变异
农田黑土
soil physical properties
field scale
spatial variation
arable Black soil
