Changes in soil carbon and nitrogen pools in a Mollisol after long-term fallow or application of chemical fertilizers, straw or manures

文献类型： 外文期刊

第一作者： Zhao, Shicheng

作者： Zhao, Shicheng;He, Ping;Zhou, Wei;Gao, Hongjun;Zhu, Ping;Hou, Yunpeng;Rong, Xiangmin;Zhang, Yuping;He, Ping;He, Ping;Christie, Peter

作者机构：

关键词： Soil C and N storage;Soil active pools;Northeast China

期刊名称：SOIL & TILLAGE RESEARCH （ 影响因子：5.374； 五年影响因子：6.368 ）

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收录情况： SCI

摘要： Appropriate fertilizer management can effectively restrain decreases in soil carbon (C) and nitrogen (N) in agricultural Mollisols in northeast China. A 22-yr-old field experiment was employed to explore the effects of fallow, chemical fertilizer N, phosphorus (P), potassium (K), or straw or manure combined with NPK (SNPK, MNPK), and 1.5 times the N rate of MNPK (1.5MNPK) application on soil C and N pools. Soil organic C (SOC), total N (TN), inorganic C (IC), and mineral N (NO3-N, NH4-N) to 100 cm soil depth and C and N in particulate organic matter (POC, PON), soil microbial biomass (MBC, MBN), and dissolved organic matter (DOC, DON) to 40 cm soil depth were determined. In all treatments, the 1.5MNPK treatment had the significantly highest (P < 0.05) SOC and TN concentrations above 40 cm soil depth and the SNPK treatment had the significantly highest (P < 0.05) IC concentration at 40-60 and 60-80 cm soil depths. Comparing the other treatments to 40 cm soil depth, in most cases 1.5MNPK and MNPK treatments at each depth had significantly higher (P < 0.05) POC, PON concentration, POC/SOC and PON/TN. SNPK treatment had significantly higher (P < 0.05) MBN and MBN/TN at 10-20 and 20-40 cm soil depths and the fallow treatment had significantly higher (P < 0.05) MBC and DOC concentrations and higher DOC/SOC ratio at each soil depth. The optimum combination of manure, straw and NPK therefore favored C and N storage in this agricultural Mollisol. (C) 2016 Elsevier B.V. All rights reserved.

分类号： S1

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