洪水灌溉土壤中速效磷淋溶积累特性的试验研究

Available-phosphorous Leaching and Accumulation in Soils after Irrigation with Flood

通过在大同市御河灌区进行的洪水灌溉试验,研究了在不同的灌水定额下,洪水灌溉后土壤剖面上速效磷的淋溶积累规律。上层土壤中速效磷养分的含量与灌溉所用洪水的含沙量、泥沙中的速效磷含量、土壤中速效磷的背景值等有关;深层土壤中的速效磷含量受到淋溶作用的影响,上层淋溶的速效磷一般在下层土壤中有所积累,速效磷的淋溶与积累量与灌水定额的大小有关。研究结果给大面积引洪灌溉和引洪补源提供参考。

The field experiment of irrigation with flood has been conducted in Yuhe irrigation district in Datong city. The law of available-phosphorous leaching and accumulation in the soil profile has been researched under different irrigation norms. The result indicates that the amount of available-phosphorous in topsoil is related in sediment concentration in flood, the quantity of available-phosphorous in silt, the back quantity in soil etc; the amount of available-phosphorous in deep soil is influenced by leaching, available-phosphorous leaching form topsoil accumulates in deep soil, the quantity of available-phosphorous leaching and accumulation is concerned tion with flood and nourishing in irrigating norms. The results can offer reference for large acreage irriga water source by diverting flood.