Soil carbon sequestration and crop yield in response to application of chemical fertilizer combined with cattle manure to an artificially eroded Phaeozem |
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| Authors: | Yueyu Sui Xiaobing Liu Xingyi Zhang Yansheng Li Keqin Zhou |
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| Institution: | Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, China |
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| Abstract: | Organic manure application is a feasible approach to alleviate the deterioration of soil erosion on soil organic carbon (SOC). However, to what extent manure application can restore carbon contents in SOC fractions in the eroded Phaeozems remains unknown. A 5-year field experiment was conducted in an artificially eroded Phaeozem with up to 30 cm of topsoil being removed. Chemical fertiliser, or chemical fertiliser plus cattle manure was applied. The contents of SOC were 23.6, 21.6 and 15.1 g C kg?1 soil for non-soil removal control, 10 and 30 cm of topsoil removal, respectively. Compared with the chemical fertiliser-only treatment, the chemical fertiliser plus manure application markedly increased SOC contents by 30–45% and C sequestration rates by 7.1–9.0-fold, especially in the fraction of 53–250 μm particulate organic carbon. However, with manure applied, SOC content in the fraction of mineral associated organic carbon in the 30 cm topsoil-removed soil was 2.9 g kg?1, 14.7% less than control (3.4 g kg?1). The combination of chemical fertliser and manure application effectively restored SOC in the eroded Phaeozems mainly through increasing the size of 53–250 μm particulate organic C fraction, but did not improve the SOC stability in severely eroded Phaeozems. |
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| Keywords: | Soil erosion fractions of SOC particulate organic carbon (POC) soil carbon stock C sequestration rate cattle manure yield |
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