【摘要】 针对宁夏贺兰山东麓地区风沙土中的养分含量较低且容易随水分流失等问题,采用大田试验和小水流自流微灌带,研究灌水量每667m~2为177、211、244、277m~3 4个不同梯度处理对风沙土0~80cm土壤全磷、速效磷含量的影响。结果表明:全磷、速效磷集中分布在0~40cm土壤,随土层深度增加逐渐减少,深层土壤磷素含量极低;灌水使得土壤的全磷、速效磷含量空间分布发生变化,表层土壤磷元素会被淋洗到深层土壤;在不同灌水量条件下,灌水量越大,表层土壤被淋洗到下层磷元素越多,且会被淋洗到越深层次土层中;灌水量为244m3处理最优。更多还原

【Abstract】 Aiming at the problems of low nutrient content in the aeolian sandy soil with loss of water and other issues existing in Ningxia Helan Mountain area,the automatic weep flow micro-irrigation belt was used,at every 667 m~2 irrigating 177,211,244,277 m~3 were carried out under field experimental condition to investigate the effect of 4gradient treatments on total phosphorus and rapidly-available phosphorus from 0 to 80cm layer in aeolian soil.The results showed that the contents of total phosphorus and rapidly-available phosphorus mainly distributed in soil with the depth of the 0-40cm.With the increase of soil depth,the contents of total phosphorus and rapidly-available phosphorus gradually reduced,and a relatively low level in the deep soil.Irrigation caused the change in the distribution of total phosphorus and rapidly-available phosphorus.Phosphorus element could be leached to deep layer from surface layer.The higher irrigation rate from top soil to depth,the more phosphorus has been leached.The irrigation with 244m~3 could achieve the best results compared with the other treatments.更多还原