不同灌溉方式对保护地土壤有机磷组分的影响

菜田土壤长期节水灌溉试验结果表明,蔬菜保护地0~60 cm土壤剖面中,滴灌、渗灌和沟灌条件下,土壤有机磷组成中均以中等活性有机磷为主,其次为活性有机磷。滴灌和渗灌处理耕层(0~20 cm)土壤中易被作物吸收利用的活性有机磷和中等活性有机磷含量高于传统沟灌处理。在10~30 cm土层范围内,渗灌处理土壤活性有机磷含量高于滴灌,而滴灌又高于沟灌。而0~60 cm土壤剖面中,中等活性有机磷含量均是滴灌大于沟灌大于渗灌。在0~40 cm土层内中稳性有机磷含量渗灌明显大于沟灌大于滴灌。40 cm以下则是沟灌大于渗灌和滴灌。0~20 cm土层土壤高稳性有机磷含量的大小顺序为沟灌大于渗灌大于滴灌。

Effect of Different Irrigation Methods on Soil Organic Phosphorus form under Protected Cultivation

The results of long-term water-saving irrigation in protected soil showed that the contents of MLOP(Moderately labile organic phosphorus) were highest among the components of organic phosphorus along 0~60 cm soil profile,and the contents of LOP(Labile organic phosphorus) was lined second under drip irrigation,seep irrigation and furrow irrigation.In drip irrigation and seep irrigation the contents of LOP and MLOP in 0~20 cm soil was higher than that of furrow irrigation.The content of LOP of 10~30 cm soil in seep irrigation were higher than that of drip irrigation and furrow irrigation.But in 0~60 cm soil the MLOP contents were highest in drip irrigation,and lowest in seep irrigation.The contents of MROP(Moderately resistant organic phosphorus) in seep irrigation were higher than that of furrow irrigation and drip irrigation significantly in 0~40 cm soil,and in 40~60 cm the MROP contents in furrow irrigation were highest,and lowest in drip irrigation.The HROP(Highly resistant organic phosphorus) contents of 0~20 cm in furrow irrigation is the highest and lowest in drip irrigation.