| 摘要: |
| 【目的】研究不同土娄土剖面的有机碳和无机碳贮量以及不同组分有机碳在0～200 cm土层的分布特征。【方法】以陕西杨凌土娄土为对象，采集了8个土娄土剖面（0～200 cm土层）样品，测定了土壤有机碳、无机碳含量以及活性有机碳和难降解有机碳的含量。【结果】① 0～200 cm土层土壤总碳贮量为266.20～631.59 t/hm2，其中有机碳贮量为120.63～177.35 t/hm2，无机碳贮量为131.64～504.71 t/hm2，分别占土壤剖面总碳贮量的20.1%～50.8%和49.2%～79.9%。② 有机碳多集中于0～100 cm剖面，其平均贮量均占有机碳贮量的60%以上；无机碳多集中于100～200 cm土层，其平均贮量占无机碳贮量的64%。③ 活性有机碳含量在0～20 cm土层最高，随着土层深度的增加而减少。④ HCl水解和HF处理后残留有机碳均是以土壤剖面的表层最高，随着土层深度的增加而明显减少，其占有机碳的比例也因土层深度的不同差异明显，但随着土层深度的增加总体上呈减少趋势。【结论】土娄土0～200 cm土层无机碳贮量是有机碳贮量的2倍，其中0～100 cm土层中有机碳所占比例相对较高，而100～200 cm土层碳主要以无机碳形态存在。 |
| 关键词: 〖XC董燕婕字3.TIF〗土 有机碳 无机碳 碳贮量 活性有机碳 难降解有机碳 |
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| 基金项目:国家“十一五”科技支撑计划项目（2008BADA4B09）；国家自然科学基金项目（40773057）；西北农林科技大学创新团队项目 |
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| The stocks and characteristics of organic and inorganic carbon in Lou soil in Yangling,Shaanxi |
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| Abstract: |
| 【Objective】The distribution and accumulation of organic and inorganic carbon in 0-200 cm profile of Lou soil were investigated.【Method】Soil samples from 8 profiles (depth of 0-200 cm) of Lou soil were collected and the contents of organic carbon,inorganic carbon,labile organic carbon,HCl-resistant and HF-resistant carbon were measured.【Result】① The results indicated the stock of soil carbon in 0-200 cm layer ranged from 266.20 to 631.59 t/hm2,among which organic carbon and inorganic carbon were 120.63-177.35 t/hm2 and 131.64-504.71 thm2,accounting for 20.1%-50.8% and 49.2%-79.9%,respectively.② Organic carbon in 0-100 cm layer was accounted for more than 60% of total organic carbon storage while inorganic carbon in 100-200 cm layer was 64% of total inorganic carbon storage.③ The highest labile carbon was in the 0-20 cm,and the content of labile carbon decreased as the depth increased.④ Both highest HCl-resistant and HF-resistant carbon occurred in the top soil and their contents decreased significantly as the depth increased.The ratios of HCl-resistant and HF-resistant to organic carbon were different in the different layer,but the decreasing trends were same as the depth increased.【Conclusion】Organic carbon is the most abundant carbon in the 0-100 cm layer in Lou soil,and inorganic carbon is the most abundant in the 100-200 cm layer. |
| Key words: Lou soil organic carbon inorganic carbon carbon stock labile organic carbon recalcitrant organic carbon |
