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砂滤管长期培养试验结果表明,有机物料和农肥施入土壤后,腐解残留率(Yt)与有机物料施入后的时间(t)遵循Yt=Y~(A t)_(oe)方程式,式中Yo为有机物料缓分解成分的碳理占加入总碳量的百分数,λ为缓解成分的分解速率。覆膜使Yt和Yo值明显降低。田间试验结果表明,覆膜降低了有机质的活性,使PQ值(胡敏酸占可提取腐殖酸的百分数)和A2/A3比值(胡敏酸在波长200nm和300nm处吸光度之比)增高,胡敏酸对光吸收增强。
The results of long-term culture experiment of sand filter showed that after the organic material and fertilizer were applied to the soil, the residual rate of decomposition (Yt) and the time (t) after the organic material was applied follow the equation of Yt = Y ~ (A t) , Where Yo is the percent of carbon added to the total carbon content of the slow decomposition component of organic material, and λ is the decomposition rate of the mitigating component. The coating reduced the Yt and Yo values significantly. Field experiments showed that the film reduced the activity of organic matter and increased the PQ value (the percentage of humic acid to extractable humic acid) and A2 / A3 ratio (the ratio of humic acid to absorbance at wavelength of 200nm and 300nm) Humic acid absorption of light enhanced.