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| Changes of Soil Labile Organic Carbon and Carbon Management Index Under Different Artificial Vegetations |
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| KeyWord:artificial vegetations; soil labile organic carbon; carbon management index（CMI）; the Hilly Loess Plateau Region |
| Author Name | Affiliation | | AN Juan-juan | College of Agricultural Sciences, Northwest Agricultural and Forestry University, Yangling 712100, China | | CHEN Shao-feng | College of Agricultural Sciences, Northwest Agricultural and Forestry University, Yangling 712100, China | | ZHAO Fa-zhu | College of Agricultural Sciences, Northwest Agricultural and Forestry University, Yangling 712100, China | | YANG Li-xia | College of Agricultural Sciences, Northwest Agricultural and Forestry University, Yangling 712100, China | | HAN Xin-hui | College of Agricultural Sciences, Northwest Agricultural and Forestry University, Yangling 712100, China
Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Yangling 712100, China | | KANG Di | College of Agricultural Sciences, Northwest Agricultural and Forestry University, Yangling 712100, China | | YANG Gai-he | College of Agricultural Sciences, Northwest Agricultural and Forestry University, Yangling 712100, China
Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Yangling 712100, China |
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| Abstract: |
| 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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