Long-term fertilization enhances soil carbon stability by increasing the ratio of passive carbon: evidence from four typical croplands

文献类型： 外文期刊

第一作者： Zhou, Wei

作者： Zhou, Wei;Xu, Minggang;Shah, Syed Atizaz Ali;Zhang, Wenju;Wu, Honghui;Wen, Shilin;Zhang, Yunlong;Gregory, Andrew S.;Xu, Minggang;Hartley, Iain P.

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关键词： Chemical fertilization; Manure; Labile carbon; Non-labile carbon; Response ratio; Carbon accumulation

期刊名称：PLANT AND SOIL （ 影响因子：4.993； 五年影响因子：5.44 ）

ISSN： 0032-079X

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收录情况： SCI

摘要： Aims Soil organic carbon (SOC) plays an important role in improving soil quality, however, how long-term fertilization influences SOC and contrasting active C (AC) and passive C (PC) pools at large scale remains unclear. The aim of this study was to examine the effect of long-term fertilization on SOC, including AC and PC, across four typical croplands in China and to explore the potential relationships and mechanisms. Methods We assessed the effect of chemical fertilizer and manure amendment (standard rate and 1.5 x standard rate of inorganic fertilizer (NPK) with or without manure (M), with a Control for comparison) at three soil depths (0-20 cm, 20-40 cm, 40-60 cm) on SOC, AC and PC. Results We found that SOC, AC and PC increased in the order NPK < NPKM < 1.5NPKM. 1.5NPKM resulting in a significant increase in SOC, AC and PC, of 76.3%, 53.0% and 108.5% respectively across the soil profile (0-60 cm) compared with Control. The response ratio of PC to long-term fertilization was 2.1 times greater than that of AC across four sites on average. In addition, clay was identified as the most important factor in explaining the response of AC and PC to different fertilization application. Conclusions Long-term fertilization enhanced both AC and PC, but the greater response of PC suggests that fertilization application could enhance the stability of C and thus the potential of cropland for SOC accumulation.

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