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Soil organic carbon contents as a result of various organic amendments to a vertisol

文献类型： 外文期刊

作者： Hua, Keke 1 ; Wang, Daozhong 1 ; Guo, Zhibin 1 ;

作者机构： 1.Anhui Acad Agr Sci, Soil & Fertilizer Res Inst, Anhui Prov Key Lab Nutrient Recycling Resources &, Hefei 230031, Peoples R China

关键词： Organic carbon retention efficiency;Manure;Long-term fertilization;delta C-13 natural isotope;Solid-state C-13 nuclear magnetic resonance

期刊名称：NUTRIENT CYCLING IN AGROECOSYSTEMS （ 影响因子：3.27； 五年影响因子：3.767 ）

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收录情况： SCI

摘要： The present study estimates the contributions of various organic amendments to soil organic carbon (SOC). The present work discusses data from a 32-year fertilization experiment using vertisol soil. Five treatments with four field replications were included: no fertilizer (CK), mineral fertilizers only (NPK), wheat straw plus NPK (SNPK), swine manure plus NPK (PMNPK), and cattle manure plus NPK (CMNPK). The C-13 signature of SOC was measured by delta C-13 natural isotope technology, and the carbon functional compositions of organic amendments were determined by solid-state C-13 nuclear magnetic resonance spectra. The average proportions of native and crop residues derived organic carbon under the SNPK, PMNPK and CMNPK treatments were 43, 40, 29, and 51, 51, 39%, respectively. The average proportions of organic carbon-derived from wheat straw (SNPK), swine and cattle manure (PMNPK and CMNPK) were 6, 9, and 32%, respectively. The quantitative relationship between carbon retention efficiency and fertilization year could be described by a significantly negative linear function (p < 0.05). The average organic carbon retention efficiencies for wheat straw, swine, and cattle manure differed substantially at 6, 10, and 31%, respectively. Their corresponding aromatic carbon contents were 6, 7, and 12%, respectively. Furthermore, incorporation of organic amendments, especially for cattle manure, led to a decrease in the yield variability and an increase in the sustainable yield index of crops compared with the CK and NPK treatments. In conclusion, the long-term continuous application of cattle manure is a preferred method for enhancing SOC storage and increasing crop production for vertisols.

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