长期化肥减量配施不同有机肥对土壤碳库的影响

Effects of Long-Term Reduction of Chemical Fertilizer and Different Organic Fertilization Combined Application on Soil Carbon Pool

摘要: 通过连续35年的定位试验，在氮磷钾养分施用量相等的水平下，研究了化肥减量配施有机肥料对红壤稻田土壤碳库的影响。结果表明，施用有机肥提升土壤中不同形态碳素含量显著高于单施化肥的效果(p < 0.05)。与单施化肥相比，连续配施有机肥料有利于提高土壤碳库管理指数和活性碳、矿化碳有效率，增幅分别为15.37%~37.84%、1.77%~8.30%和4.62%~29.78%。相关分析表明，土壤碳库管理指数与土壤总有机碳、活性碳、矿化碳和微生物量碳均呈极显著相关。

Abstract: A 35 years long-term experiment with five different kinds of fertilizer application treatments was conducted to examine the effect of organic-inorganic fertilizer combined application on soil carbon pool in reddish paddy soil under the conditions of equal Nitrogen, phosphorus and potassium nu-trient. The results showed that the contents of various soil carbon forms were increased higher by organic fertilizer than chemical fertilizer significantly (p < 0.05). As compared with chemical ferti-lizer treatment, organic-inorganic fertilizer combined application enhanced the soil carbon pool management index and availability of active carbon, mineralized carbon and increased by 15.37% - 37.84%, 1.77% - 8.30% and 4.62% - 29.78%, respectively. There was an extremely significant par-abolic correlation between soil CPMI and the contents of the soil total organic carbon, active carbon, mineralized carbon and microbial biomass carbon.