论文部分内容阅读
在宁夏灌区和旱区30块农田分别采集了0~120 cm深土壤剖面样品,测定了土壤全磷和速效磷含量,分析了土壤磷素养分含量的空间变异性。结果表明,在0~120 cm深土壤剖面中的全磷和速效磷含量,灌区土壤显著高于旱区土壤,在剖面点之间和土壤层次之间存在极显著差异,而且在土层间还存在着正相关。其变异系数总体上是旱区土壤大于灌区土壤,速效磷大于全磷。从地区来看,旱区土壤全磷和速效磷含量的变异系数随剖面深度的增加而增大,灌区土壤全磷量的变异系数在剖面层次之间差别不大,而速效磷的变异系数随剖面深度的增加而呈降低趋势。在0~120 cm深土壤剖面中,土壤全磷和速效磷的累积量灌区较旱区分别高出26.8%和65.0%,在土类间也存在较大差异。
The 0-120 cm deep soil profile samples were collected from 30 farmland in irrigated and arid areas of Ningxia. The contents of total phosphorus and available phosphorus in soil were measured, and the spatial variability of phosphorus in soil was analyzed. The results showed that the contents of total phosphorus and available phosphorus in 0-120 cm deep soil profile were significantly higher in irrigated area than those in dry area, with significant difference between the profile points and soil layers, There is a positive correlation. The coefficient of variation is generally arid area soil is larger than the irrigated area soil, available phosphorus is greater than total phosphorus. From a regional perspective, the coefficient of variation of total phosphorus and available phosphorus in arid area increased with the increase of section depth, while the coefficient of variation of total phosphorus in the irrigated area was not significantly different between the sections. However, the coefficient of variation The depth of the profile increases but decreases. In 0-120 cm deep soil profile, the accumulation of soil total phosphorus and available phosphorus was 26.8% and 65.0% higher in the irrigated area than in the arid area, respectively, and there were also significant differences among soil types.