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本文通过棕壤长期定位施肥试验,研究了玉米-玉米-大豆轮作条件下不同施肥处理土壤有机碳及其不同密度组分的变化及其影响因素。结果表明:经过27年的长期不同施肥,土壤有机碳含量有了明显变化,总的变化趋势是:高量有机肥区(12.30gkg-1)>低量有机肥区(11.41gkg-1)>化肥区(9.95gkg-1)>1979年(试验前9.03gkg-1)>对照处理(8.23gkg-1),尤其以高量有机肥配施化肥处理的有机碳水平最高,氮磷钾配合施用有机碳水平要高于其它单施化肥处理;长期施肥可以显著提高土壤中轻组部分含量和轻组有机碳含量,不同施肥处理间差异显著。单施化肥处理,特别是氮磷钾配合施用,轻组部分数量和轻组有机碳含量高于无肥处理和试验前土壤。有机无机肥配合施用轻组有机碳含量明显高于单施化肥处理。施用不同肥料均可以提高土壤重组有机碳含量,有机无机肥配施效果明显。
Through long-term fertilization experiments on brown earth, this paper studied the changes of soil organic carbon and its densities under different fertilization treatments and their influencing factors under the condition of corn-corn-soybean rotation. The results showed that after 27 years of long-term fertilization, the content of soil organic carbon changed significantly. The overall trends were: high-level organic fertilizer area (12.30gkg-1)> low-level organic fertilizer area (11.41gkg-1) (9.95gkg-1)> 1979 (pre-test 9.03gkg-1)> control treatment (8.23gkg-1), especially the organic carbon with the highest organic manure fertilizer was the highest. The level of organic carbon was higher than that of other chemical fertilizers alone. Long-term fertilization could significantly increase the content of light fraction and light fraction of organic carbon in soil, with significant differences among different fertilization treatments. Fertilizer treatment alone, especially with the combination of NPK, light part of the number of groups and light organic carbon content is higher than the non-fertilizer treatment and before the test soil. Organic-inorganic fertilizer combined with light application of organic carbon content was significantly higher than the single chemical fertilizer treatment. Application of different fertilizers can increase soil organic carbon content, organic and inorganic fertilizer application effect is obvious.