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首页> 外文期刊>Scientia Agricola >Carbon sequestration and greenhouse gases emissions in soil under sewage sludge residual effects
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Carbon sequestration and greenhouse gases emissions in soil under sewage sludge residual effects

机译：污泥残余效应下土壤固碳与温室气体排放

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The large volume of sewage sludge (SS) generated with high carbon (C) and nutrient content suggests that its agricultural use may represent an important alternative to soil carbon sequestration and provides a potential substitute for synthetic fertilizers. However, emissions of CH4 and N2O could neutralize benefits with increases in soil C or saving fertilizer production because these gases have a Global Warming Potential (GWP) 25 and 298 times greater than CO2, respectively. Thus, this study aimed to determine C and N content as well as greenhouse gases (GHG) fluxes from soils historically amended with SS. Sewage sludge was applied between 2001 and 2007, and maize (Zea mays L.) was sowed in every year between 2001 and 2009. We evaluated three treatments: Control (mineral fertilizer), 1SS (recommended rate) and 2SS (double rate). Carbon stocks (0-40 cm) were 58.8, 72.5 and 83.1 Mg ha(-1) in the Control, 1SS and 2SS, respectively, whereas N stocks after two years without SS treatment were 4.8, 5.8, and 6.8 Mg ha(-1), respectively. Soil CO2 flux was highly responsive to soil temperature in SS treatments, and soil water content greatly impacted gas flux in the Control. Soil N2O flux increased under the residual effects of SS, but in 1SS, the flux was similar to that found in moist tropical forests. Soil remained as a CH4 sink. Large stores of carbon following historical SS application indicate that its use could be used as a method for carbon sequestration, even under tropical conditions.
机译：高碳（C）和养分含量高的污水污泥（SS）的大量产生表明，其农业用途可能代表了固存土壤碳的重要替代方法，并为合成肥料提供了潜在的替代方法。但是，CH4和N2O的排放可能抵消土壤C的增加或肥料生产的节省，因为这些气体的全球升温潜能值（GWP）分别是CO2的25倍和298倍。因此，本研究旨在确定历史上用SS改良过的土壤中的C和N含量以及温室气体（GHG）通量。在2001年至2007年之间施用了污水污泥，并在2001年至2009年之间每年播种玉米（Zea mays L.）。我们评估了三种处理方法：对照（矿物肥料），1SS（推荐比率）和2SS（双重比率）。对照，1SS和2SS的碳储量（0-40 cm）分别为58.8、72.5和83.1 Mg ha（-1），而未经SS处理的两年后的碳储量分别为4.8、5.8和6.8 Mg ha（-） 1）。在SS处理中，土壤CO2通量对土壤温度高度敏感，土壤水含量在对照中极大地影响了气体通量。在SS的残留作用下，土壤N2O通量增加，但在1SS中，通量与潮湿热带森林中的相似。土壤仍然是CH4汇。在历史性的SS应用之后，大量的碳储量表明，即使在热带条件下，也可以将其用作封存碳的方法。

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