| 安娟娟,陈少锋,赵发珠,杨丽霞,韩新辉,康 迪,杨改河.不同人工植被下土壤活性有机碳及碳库管理指数变化[J].农业环境科学学报,2014,33(5):985-991. |
| 不同人工植被下土壤活性有机碳及碳库管理指数变化 |
| Changes of Soil Labile Organic Carbon and Carbon Management Index Under Different Artificial Vegetations |
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| DOI：10.11654/jaes.2014.05.023 |
| 中文关键词: 人工植被 土壤活性有机碳 碳库管理指数（CMI） 黄土丘陵区 |
| 英文关键词: artificial vegetations soil labile organic carbon carbon management index（CMI） the Hilly Loess Plateau Region |
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| 中文摘要: |
| 探讨了黄土丘陵区不同人工植被下土壤总有机碳（TOC）、3种氧化活性有机碳及碳库管理指数（CMI）的变化特征。结果表明：0～100 cm土层，不同人工植被下土壤总有机碳、3种活性有机碳含量均随土层加深而递减，但整个土壤剖面总有机碳及其活性组分含量均表现为刺槐>柠条>撂荒地>坡耕地，且差异主要在0～40 cm土层；同一土层，不同人工植被下3种土壤活性有机碳含量及有效率表现为低活性有机碳（0.67～2.02 g·kg-1，10.47%～33.00%）>中活性有机碳（0.12～1.38 g·kg-1，6.44%～22.52%）>高活性有机碳（0.03～0.68 g·kg-1，2.10%～11.09%）。不同人工植被下有机碳活性越强，则其CMI的差异越大且影响深度越深，相比坡耕地，3种人工植被均显著提升了0～100 cm深各土层高活性有机碳CMI，且平均增幅表现为刺槐（213.9%）>柠条（152.4%）>撂荒（82.6%），中和低活性有机碳CMI只在人工刺槐和柠条林下100 cm深各土层显著增加。综上，人工林植被具有提升100 cm土壤碳库及其质量的潜力，且总体以刺槐效果较佳。 |
| 英文摘要: |
| Soil organic carbon is often affected by organic inputs. In this study, three pools of soil labile organic carbon（LOC） with different turnover rates and soil carbon management index（CMI） were investigated under different artificial vegetations for 20 years in the Hilly Loess Plateau Region, China. In 0~100 cm soil profile, contents of total organic carbon（TOC） and LOC decreased with increasing soil depth. Compared to the farmland, artificial vegetations increased the contents of TOC and LOC mainly in the 0～40 cm soil layer. Both TOC and LOC decreased in order of Robinia>Caragana microphylla>abandonment>farmland. At the same depth, the contents of three LOC and the ratios LOC to TOC were lowly labile organic carbon（0.67～2.02 g·kg-1 and 10.47%～33.00%）> mid-labile organic carbon（0.12～1.38 g·kg-1 and 6.44%～22.52%）>highly labile organic carbon（0.03～0.68 g·kg-1 and 2.10%～11.09%）. The CMI of highly labile organic carbon was increased in the 0～100 cm soil layer under the artificial vegetations, with increasing percentage in Robinia（213.9%）> Caragana microphylla（152.4%）>abandonment（82.6%） in comparison with the farmland. However, the CMI of lowly and mid-labile organic carbon was found to increase only under Robinia and Caragana microphylla. The present results show that artificial vegetations have the potential to promote soil organic carbon pools with Robinia performing best. |
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