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氨挥发是肥料氮素损失的重要途径之一,肥料类型、土壤类型、肥料用量以及土壤全盐量均影响氨挥发损失率及挥发特征。采用通气法测定了磷酸脲和尿素两种肥料6个施肥量处理分别施入6个不同盐渍化程度(1.7、9.9、16.4、23.2、29.1、37.9g/kg)的土壤后氨挥发累积状况和动力学特性,以及土壤氨挥发累积量与土壤电导值之间的相关性。结果表明:(1)在土壤总盐介于1.66—37.9 g/kg的范围内,随着土壤含盐量增加,各尿素与磷酸脲处理的氨挥发累积量显著增加;土壤含盐量对氨挥发速率有显著的促进作用。(2)处理二次线性函数拟合的二项式系数a均为负值,表明:在不同盐渍化条件下肥料的挥发速率是随着时间增长而降低的;一次线性函数和Elovich方程的斜率a随土壤含盐量增加而增大,表明:土壤盐渍化将加剧土壤的氨挥发速率。(3)土壤氨挥发累积量与电导值拟合结果符合logistic方程(︱R︱分别为0.9732,0.9815,0.965,0.9182,0.9817,0.9971︱R︱>r0.01=0.9172,n=6),氨挥发累积量随土壤电导值呈“S”型增长。
Ammonia volatilization is one of the important ways of fertilizer nitrogen loss. Fertilizer type, soil type, fertilizer amount and total salt content of soil all affect ammonia volatilization loss and volatilization. Aeration method was used to determine the cumulative ammonia volatilization of 6 fertilizers applied to six different salinization levels (1.7, 9.9, 16.4, 23.2, 29.1 and 37.9 g / kg) And kinetic characteristics, as well as the correlation between soil ammonia volatiles accumulation and soil conductivity. The results showed that: (1) In the range of 1.66-37.9 g / kg of soil total salt, with the increase of soil salinity, the accumulation of ammonia volatilization of urea and urea phosphate significantly increased; Volatilization rate has a significant role in promoting. (2) The binomial coefficient a of the fitted quadratic linear function is negative, which indicates that the rate of fertilizer volatilization decreases with time under different salinization conditions. The linear function and the Elovich equation Slope a increases with soil salinity, indicating that soil salinization will aggravate ammonia volatilization rate in soil. (3) The fitting results of soil ammonia volatilization and conductance fit the logistic equation (︱R︱respectively, 0.9732,0.9815,0.965,0.9182,0.9817,0.9971︱R︱r0.01 = 0.9172, n = 6), ammonia Volatile cumulants with soil conductivity was “S ” type of growth.