陕西几种土壤中硫酸铵的硝化作用及其影响因素

NH 4 SO 4 Nitrification and Its Influence Factors in Shaanxi

在实验室条件下研究了硫胺在陕西省４种土壤中的硝化作用及其影响因素。结果表明，它们的硝化作用有明显差异，硝化作用的强弱为黄绵土＞黑垆土＞黑油土＞红油土。土壤水分含量对硝化作用有明显影响，６０％的田间持水量是土壤硝化作用进行的适宜水分；温度对硝化作用有显著影响，３０℃为土壤硝化作用的适宜温度；不同氮肥品种对土壤硝化作用的影响，主要受制于阴离子的种类，Ｃ１对硝化作用有抑制作用；施入有机物对硝化作用的影响为麦秸＞玉米秸＞田菁。

Under the lab condition, the nitrification and its influence factors of four soils were studied. The main conclusion were as follows: The nitrification of four soils was in theorder: Yellow cotton soil>Helu soil>Heyou soil>Hongyou soil. Soil moisture content obviously affected soil nitrification. And 60% of F.C. could be considered as critical soil moisture for nitrification. The temperature had affected the nitrification seriously, and 30℃ could be taken as the optimum temperature. Variation of nitrification for the different nitrogen fertilizers depended on the different kinds of anion, the Cl could seriously restrain the nitrification. Different kinds of organic matterials had greatly affected the nitrification of nitrogeous fertilizer. After the organic material mixed with soil, sigmoildal curve of nitrification converted to the rise and fall curves. The nitrification of nitrogenous fertilizer was in the order,namely, Sesbanla>Corn straw>Wheat straw.