【摘要】 为揭示水稻土有机质的变化规律,通过长期定位施肥试验研究了27年的不同施肥处理水稻土中有机质含量及其组成。结果表明,长期施肥不同处理的土壤有机质消长呈现明显差异,在等量氮、磷、钾养分的前提下,长期有机-无机肥配施比无肥或单施化肥更有利于稻田土壤有机质的积累;单施化肥、有机-无机肥配施各处理土壤腐殖酸、HA、FA变化趋势基本相同,但有机-无机肥配施土壤腐殖酸、HA、FA一直高于无肥及化肥处理,而且有机-无机肥配施有利于土壤中HA和FA的增加,HA/FA比值随着时间的延伸逐渐减小;有机-无机肥配施可以提高土壤易氧化有机质含量;而且长期施肥土壤有机质与易氧化有机质呈极显著正相关,与全氮、水解氮含量及产量显著正相关。易氧化有机质与土壤全氮、有效磷含量及产量呈显著正相关。其中水稻产量与易氧化有机质的相关性(r=0.818 1*)比与有机质(r=0.802 0)的相关性较高,说明易氧化有机质对水稻增产有较大的贡献。更多还原

【Abstract】 To reveal variation of organic matter content in red paddy soil, Through a27 years-located fertilization experiment in red paddy soil, the content and composition of organic matter in paddy soil were studied in this paper. The result showed that: the dynamics of soil organic matter of the different fertilization treatments showed significant differences, In the premise of equal nutrient(nitrogen and phosphorus and potassium), combining application of organic-inorganic was benefited for the accumulation of organic matter in paddy soil than without fertilizer treatment or chemical fertilizer treatment; the dynamics of soil humic acid, HA and FA of chemical fertilizer only and Combining application of organic-inorganic treatments had basically the same trend, But the contents of humic acid, HA and FA of combining application of organic-inorganic treatments had been higher than that without fertilizer and chemical fertilizer treatment. Moreover combining application of organic-inorganic treatments was benefited for improving the contents of HA and FA, but decreasing HA/FA ratio as an extension of time. Combining application of organic-inorganic was benefited for improving the contents of readily oxidizable organic matter. And the contents of soil organic matter in long-term experiment and the contents of readily oxidizable O.M were highly significant positive correlation and the contents of soil total nitrogen, avail nitrogen and potassium were significant positive correlation; the contents of soil readily oxidizable O.M and the contents of soil total nitrogen, available P and rice yield were significant positive correlation. Thereinto, the correlation(r=0.818 1*) between the rice yield and soil readily oxidizable O.M was higher than the correlation(r=0.802 0) between the rice yield and soil organic matter. It showed the soil readily oxidized organic matter had greater contribution to the rice yield.更多还原