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分层采集连续7年分别用渗灌、滴灌和沟灌灌溉的保护地0～80cm土层土壤样品,测定有机质、全氮及无机态氮和有机态氮含量,研究灌溉方法对土壤氮素形态及其数量剖面分布的影响。结果表明,三种灌溉处理0～80cm剖面土壤有机质含量变化范围为8.47～36.48 g kg-1,渗灌与滴灌有机质剖面分布相似,二者与沟灌差异较大;沟灌除30～40cm层次有机质含量低于渗灌和滴灌外,其它层次有机质含量均高于渗灌和滴灌处理。土壤全氮含量变化范围为0.72～3.97 g kg-1,在0～20cm土层不同灌溉方法之间差异显著,渗灌最大,沟灌次之,滴灌最小。无机硝态氮、铵态氮含量的变化范围分别为19.16～1442.06 mg kg-1和0～15.28 mg kg-1,在0～20cm土层各处理之间差异较为明显,以渗灌最大,沟灌次之,滴灌最小。有机态氮含量的变化范围为683.79～2512.87 mg kg-1,各处理之间的差异主要表现在0～30cm土层,其中0～10cm土层以渗灌处理有机态氮含量最高、沟灌次之,滴灌最低,10～30cm沟灌处理有机态氮含量却高于渗灌和滴灌处理。
The soil samples of 0 ~ 80cm soil layer in the protected areas for seepage, drip irrigation and furrow irrigation for 7 consecutive years were stratified and collected. The contents of organic matter, total nitrogen, inorganic nitrogen and organic nitrogen were measured. The effects of different irrigation methods on soil nitrogen form and The number of sections of the distribution of the impact. The results showed that the soil organic matter content ranged from 8.47 to 36.48 g kg-1 in the 0 ~ 80cm section of the three irrigation treatments. The distribution of organic matter in the infiltration irrigation and drip irrigation was similar, and the difference was significant between the two. The organic matter content Below the level of infiltration and drip irrigation, the contents of organic matter in other layers were higher than those of infiltration and drip irrigation. Soil total nitrogen content ranged from 0.72 to 3.97 g kg-1. There was significant difference among different irrigation methods in 0-20 cm soil layer, with the largest infiltration irrigation followed by furrow irrigation and the lowest drip irrigation. The contents of nitrate nitrogen and ammonium nitrogen in the soil ranged from 19.16 to 1442.06 mg kg-1 and from 0 to 15.28 mg kg-1, respectively. The differences were significant among 0-20 cm soil layers, Followed by the smallest drip irrigation. The content of organic nitrogen varied from 683.79 mg / kg to 2512.87 mg kg-1. The differences among treatments were mainly in 0-30 cm soil layer, of which 0-10 cm soil layer had the highest contents of organic nitrogen, followed by furrow irrigation , The lowest drip irrigation, organic nitrogen content of 10 ~ 30cm furrow irrigation was higher than that of irrigation and drip irrigation.