不同水质灌溉土壤磁化率空间变异性研究

Spatial variability of soil magnetic susceptibility under different water qualities for irrigation

采用地统计学和GIS相结合的方法,对太行山山前平原城郊区不同水源灌溉条件下土壤磁化率的空间变异性进行研究,并探讨了土壤磁畴状态.结果表明：不同水源灌溉条件下,土壤磁化率均服从正态分布;在一定范围内均存在空间相关性,半方差函数均符合球状模型,具有中等变异程度;变程变化在5.14～10.08 km.污灌区和清灌区的土壤磁化率差异明显,东西（EW）和西北-东南（NW-SE）方向的变异最大,土壤磁性物质主要为细的超顺磁颗粒.

The spatial variability of soil magnetic susceptibility and magnetic domain under different water qualities at Taihang piedmont was investigated based on geostatistics methods and GIS technique. Results show that soil magnetic susceptibility is normal distribution, existing spatial correlation in certain range. Semi-variance experimental models are fitted to spherical and moderate spatial variability. The correlation distance of soil magnetic susceptibility range from 5.14 km to 10. 08 kin. The spatial distribution maps of magnetic susceptibility show obvious difference between sewage and clean irrigation water. The most variance comes out from east to west and from northwest to southeast. The magnetic properties in study area are controlled by the presence of super-paramagnetic grains.