【摘要】 以宁夏吴忠市红寺堡不同种植年限的淡灰钙土为研究对象,用物理-化学联合分组方法研究土壤全碳和有机碳不同组分随种植年限的变化。结果表明,淡灰钙土全碳含量最高为20.12 g/kg,有机碳含量最高为8.84 g/kg,与碳饱和相距甚远;土壤全碳和有机碳随着种植年限的增加,短期内呈上下波动的曲线,全碳呈上升趋势,有机碳呈下降趋势。游离态颗粒有机碳含量最高,其次为物理保护有机碳,然后为化学保护有机碳,生物化学保护有机碳所占比例最小。粗颗粒组分有机碳与种植年限呈负相关,细颗粒组分有机碳与种植年限呈正相关。更多还原

【Abstract】 The light sierozems in Hongsipu of different cultivating years was used as the research object, themethod of physical-chemical fractionation was conducted in light sierozems to study the changes of soil organic car-bon along with the cultivating year. The results showed that the total carbon of light sierozems soil content up to20.12 g/kg, the organic carbon content up to 8.84 g/kg, it saturated with carbon far apart. Total carbon and organiccarbon in soil increased with increasing years of planting, present a curve fluctuates up and down in the short term,but in the long run, all carbon had a rising trend, organic carbon had a downward trend. Free particles of organic car-bon content were the highest, followed by the physical protection of organic carbon, and organic carbon for chemicalprotection, protect the minimum proportion of organic carbon, biochemistry components of fine particulate organiccarbon, coarse particulate organic carbon component and cultivation year was negatively correlated, but the fine par-ticle was opposite.更多还原