Response of soil organic carbon stability and sequestration to long-term phosphorus application: insight from a 9-year field experiment in saline alkaline paddy soil

文献类型： 外文期刊

第一作者： Chen, Mengmeng

作者： Chen, Mengmeng;Song, Xiaoyou;Liu, Lu;Jing, Zhichang;Miao, Jianyong;Ding, Xiaodong;Zhang, Shirong;Chen, Mengmeng;Liu, Lu;Li, Yuyi

作者机构：

关键词： Phosphorus addition; Carbon fractions; Soil carbon sequestration; Saline alkaline soil

期刊名称：PLANT AND SOIL （ 影响因子：4.9； 五年影响因子：5.2 ）

ISSN： 0032-079X

年卷期： 2023 年

页码：

收录情况： SCI

摘要： Background and aimsPhosphorus (P) addition is considered key factor in soil organic carbon (SOC) cycle. The potential impact mechanisms of P addition on SOC stability and sequestration were explored in saline-alkali soil.MethodsA 9-year field experiment was arranged in the Yellow River Delta, which included (i) CK, no fertilization; (ii) NK, N and K fertilizer application; (iii) NP1K and (iv) NP2K, NK plus 28 and 56 kg P ha-1 year-1 application, respectively.ResultsCompared with NK, the content of particulate OC (POC) was significantly increased by 29.9% and 26.8% in NP1K and NP2K treatments, respectively. The variation trend of aromatic-C and microbial biomass C (MBC) was similar to that of POC, which were positively corelated with SOC sequestration. Meanwhile, C and specific C mineralization rate (CMR, SCMR) were increased with P addition, which might be due to the decrease of carboxyl or amidogen-C. Moreover, owing to the increase in root biomass, SOC sequestration was significantly increased by more than 9.3% with P addition. Redundancy analysis further indicated that root biomass was the main factor in regulating SOC. While the CMR and SCMR were higher of NP2K treatment than those of NP1K treatment, this might result in SOC sequestration was no significant change between the two treatments.ConclusionLong-term low-level P fertilization is a preferable practice to increase POC, stable chemical composition and MBC, and then SOC sequestration. These findings provide important insights into how long-term different levels of P application regulate soil C cycling in saline-alkali paddy soil.

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