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以贵州西南部典型石漠化治理示范区内5年、17年、30年生花椒林和乔木林(约60年)土壤为对象,采用室内模拟培养方法研究了0~15、15~30、30~50 cm这3个剖面土壤有机碳的矿化特征及活性有机碳的含量变化.结果表明,30年生花椒林土壤有机碳累计矿化量在各层土壤中均高于对应的乔木林土壤,而5年、17年生花椒林地各层土壤则均低于对应的乔木林土壤,3种花椒林土壤有机碳累计矿化量分配比在各层均高于对应的乔木林土壤.长期种植花椒增加了土壤有机碳的矿化量,降低了土壤有机碳的稳定性.乔木林土壤易氧化有机碳和颗粒有机碳在各层均显著高于对应的3种花椒林土壤(P<0.05).随花椒种植年限增加,土壤易氧化有机碳和颗粒有机碳含量在0~15 cm和15~30 cm土层先增加后减少,在30~50cm土层则为先减少后增加.短期花椒种植有利于土壤活性有机碳的增加,长期则降低了0~15 cm和15~30 cm层土壤活性有机碳含量,花椒种植有利于深层(30~50 cm)土壤活性有机碳的积累.
Taking the soil of 5 years, 17 years and 30 years of perennial and arborvitae forests (about 60 years) in the typical rocky desertification control demonstration area in the southwestern Guizhou Province as an example, the indoor simulated cultivation methods were used to study the effects of 0-15, 15-30, 30, ~ 50 cm soil organic carbon mineralization and the content of active organic carbon in the three profiles.The results showed that the cumulative mineralization of soil organic carbon in the 30-year-old Z. perenne plantation was higher than that of the corresponding arbor forest in all layers of soils, However, the soil layers of 17-year-old pepper plantation were lower than the corresponding arbor forest soil, and the cumulative mineralization of soil organic carbon in the three plantations was higher than that of the corresponding arbor forest layer in all layers. The amount of mineralization of soil organic carbon decreased, and the stability of soil organic carbon was reduced.The contents of soil organic carbon and particulate organic carbon in soil were significantly higher than those in the corresponding three kinds of soil (P <0.05) The planting age of pepper increased, soil organic carbon and particulate organic carbon content increased first and then decreased in 0 ~ 15 cm and 15 ~ 30 cm soil layer, then decreased and then increased in 30 ~ 50 cm soil layer. The increase of soil active organic carbon decreased by 0 ~ 15 cm and 1 in the long term Soil active organic carbon content in 5 ~ 30 cm layer was beneficial to the accumulation of soil active organic carbon in deep layer (30 ~ 50 cm).