CAJ | 학술논문

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30~50 cm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.
이귀주서남부전형석막화치리시범구내5년、17년、30년생화초림화교목림(약60년)토양위대상,채용실내모의배양방법연구료0~15、15~30、30~50 cm저3개부면토양유궤탄적광화특정급활성유궤탄적함량변화.결과표명,30년생화초림토양유궤탄루계광화량재각층토양중균고우대응적교목림토양,이5년、17년생화초임지각층토양칙균저우대응적교목림토양,3충화초림토양유궤탄루계광화량분배비재각층균고우대응적교목림토양.장기충식화초증가료토양유궤탄적광화량,강저료토양유궤탄적은정성.교목림토양역양화유궤탄화과립유궤탄재각층균현저고우대응적3충화초림토양(P﹤0.05).수화초충식년한증가,토양역양화유궤탄화과립유궤탄함량재0~15 cm화15~30 cm토층선증가후감소,재30~50 cm토층칙위선감소후증가.단기화초충식유리우토양활성유궤탄적증가,장기칙강저료0~15 cm화15~30 cm층토양활성유궤탄함량,화초충식유리우심층(30~50 cm)토양활성유궤탄적적루.
Taking 5-year-old Chinese prickly ash orchard(PO-5), 17-year-old Chinese prickly ash orchard(PO-17),30-year-old Chinese prickly ash orchard(PO-30) and the forest land(FL,about 60 years) in typical demonstration area of desertification control test in southwestern Guizhou as our research objects, the aim of this study using a batch incubation experiment was to research the mineralization characteristics of soil organic carbon and changes of the labile soil organic carbon contents at different depths (0-15 cm, 15-30 cm, and 30-50 cm) . The results showed that:the cumulative mineralization amounts of soil organic carbon were in the order of 30-year-old Chinese prickly ash orchard, the forest land, 5-year-old Chinese prickly ash orchard and 17-year-old Chinese prickly ash orchard at corresponding depth. Distribution ratios of CO2-C cumulative mineralization amount to SOC contents were higher in Chinese prickly ash orchards than in forest land at each depth. Cultivation of Chinese prickly ash in long-term enhanced the mineralization of soil organic carbon, and decreased the stability of soil organic carbon. Readily oxidized carbon and particulate organic carbon in forest land soils were significantly more than those in Chinese prickly ash orchards at each depth(P﹤0. 05). With the increasing times of cultivation of Chinese prickly ash, the contents of readily oxidized carbon and particulate organic carbon first increased and then declined at 0-15 cm and 15-30 cm depth, respectively, but an opposite trend was found at 30-50 cm depth. At 0-15 cm and 15-30 cm, cultivation of Chinese prickly ash could be good for improving the contents of labile soil organic carbon in short term, but it was not conducive in long term. In this study, we found that cultivation of Chinese prickly ash was beneficial for the accumulation of labile organic carbon at the 30-50 cm depth.