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通过4年大田定位试验,研究不同施肥措施(单施化肥,化肥+畜禽粪肥,化肥+秸秆还田,化肥+绿肥)对白土区稻田土壤总有机碳、水溶性有机碳、易氧化有机碳和颗粒有机碳等活性有机碳组分的影响。结果表明:相对于单施化肥,增施有机肥能显著提高总有机碳和各组分活性有机碳含量,其中秸秆还田处理的总有机碳、易氧化有机碳和颗粒有机碳含量均最高,增加幅度分别为19.6%、67.4%和15.7%;增施畜禽粪肥处理的水溶性有机碳含量最高,增幅为60.9%;不同施肥措施对易氧化有机碳占总有机碳比例的影响高于水溶性有机碳和颗粒有机碳;秸秆还田等有机培肥措施显著提高土壤碳库指数,较对照提高17.6%~85.2%。相关性分析表明:总有机碳、碳库管理指数与各组分活性有机碳间均表现出显著或极显著正相关,相关系数分别为0.691~0.824和0.593~0.803;不同有机碳组分和碳库管理指数与碱解氮和速效钾之间呈显著或极显著相关,与速效磷间仅水溶性有机碳表现出极显著正相关,相关系数为0.816。可见,白土稻田上增施有机肥能不同程度地提高总有机碳、活性有机碳含量和碳库管理指数,相对于易氧化有机碳和颗粒有机碳,水溶性有机碳对白土稻田施肥措施的反应更为敏感。
Through 4-year field experiment, the effects of different fertilization (fertilizer application, fertilizer + livestock and poultry manure, chemical fertilizer + straw returning and chemical fertilizers + green manure) on soil total organic carbon, water-soluble organic carbon And particulate organic carbon and other active organic carbon components. The results showed that compared with the single application of chemical fertilizers, organic manure increased total organic carbon and active organic carbon in all components remarkably, of which the contents of total organic carbon, readily oxidizable organic carbon and particulate organic carbon were the highest, The increase rate was 19.6%, 67.4% and 15.7% respectively; the content of water-soluble organic carbon increased by 60.9% in the application of livestock manure treatment; the effect of different fertilization measures on the ratio of organic carbon to organic carbon was higher than that of water-soluble Organic carbon and particulate organic carbon. The organic fertilization measures such as straw returning significantly increased soil carbon pool index by 17.6% -85.2% compared with the control. Correlation analysis showed that the total organic carbon and carbon stock management index showed significant or very significant positive correlation with the active organic carbon in each component, the correlation coefficients were 0.691-0.824 and 0.593-0.803, respectively. The contents of different organic carbon components and carbon There was a significant or very significant correlation between the management index and alkali-hydrolyzable nitrogen and available potassium, and there was a significant positive correlation between available-phosphorus and water-soluble organic carbon, with a correlation coefficient of 0.816. It can be seen that the organic manure added to the paddy field can increase the total organic carbon, the content of active organic carbon and the management index of carbon pool to some extent. Compared with the easily oxidizable organic carbon and particulate organic carbon, the response of water-soluble organic carbon to the fertilization of white clay paddy More sensitive.