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用田间定位试验和砂泸管模拟试验,研究不同有机物料、灌水条件和有机肥用量对土壤有机质累积和分解系数的影响。结果表明:不同有机物料,第一年矿化率毛苕秸秆、玉米秸秆>厩肥,第二年趋于一致,达到相对稳定。当年累积系数,根茬>厩肥>玉米秸秆,受施用量的影响较小。稳定有机质分解系数,旱地>水浇地。土壤有机质消长,不施肥有下降趋势,施化肥能维持土壤原有机质水平。在化肥基础上增施有机肥,土壤有机质提高程度与施有机肥量呈极显著正相关。
The effects of different organic materials, irrigation conditions and organic manure on the accumulation and decomposition coefficient of soil organic matter were studied by field experiment and sand-tube experiment. The results showed that in the first year of different organic materials, the rates of mineralization were straw, corn stover> manure, the second year tended to be consistent and reached relatively stable. The cumulative coefficient of the year, stubble> manure> corn stalks, less affected by the amount of application. Stable organic matter decomposition coefficient, dry land> irrigated land. Soil organic matter growth and decline, no fertilizer decline, fertilization can maintain the level of soil organic matter. In the organic fertilizer based on chemical fertilizers, soil organic matter increased with the amount of organic manure was significantly and positively correlated.