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Nitrogen and phosphorus addition mediate soil priming effects via affecting microbial stoichiometric balance in an alpine meadow
Science of the Total Environment ( IF 8.2 ) Pub Date : 2023-11-05 , DOI: 10.1016/j.scitotenv.2023.168350 Wenkuan Qin 1 , Jiguang Feng 1 , Qiufang Zhang 2 , Xia Yuan 3 , Huakun Zhou 4 , Biao Zhu 1
Science of the Total Environment ( IF 8.2 ) Pub Date : 2023-11-05 , DOI: 10.1016/j.scitotenv.2023.168350 Wenkuan Qin 1 , Jiguang Feng 1 , Qiufang Zhang 2 , Xia Yuan 3 , Huakun Zhou 4 , Biao Zhu 1
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Priming effect (PE) plays a crucial role in regulating the decomposition of soil organic matter (SOM). Multiple empirical results have shown that nitrogen (N) and phosphorus (P) addition can significantly alter the direction and intensity of PE, which may significantly affect carbon turnover in grasslands, especially in alpine meadows that are sensitive to N and P enrichment. To evaluate the PE responses to N and/or P addition, we conducted an incubation experiment by adding C-labeled glucose and nutrient additions (+N, +P, and +NP) in soils collected from an alpine meadow. The soils were incubated for 30 days and soil/microbial properties and enzyme activities were measured. Partial correlation and linear regression analyses were then performed to investigate their correlations with PE. The results showed that mean PE intensity among all treatments was 0.61 mg C g soil or 1.35 (ratio). Nitrogen addition increased PE intensity, which was attributed to the better match between soil resources and microbial demands and enhanced enzyme activities. However, the PE intensity in P-addition soils was lower than that in control soils. This discrepancy may be related to the P-induced decrease of N availability and stronger microbial C/N imbalance. No significant response of PE intensity to NP addition was detected, and this could be explained by the offset of positive N effects and negative P effects on microbial decomposition. In this experiment, N or P addition altered the PE intensity by mediating the match between soil C:N:P ratio and microbial demands, which supported the stoichiometric decomposition hypothesis. Overall, our study highlights the importance of considering the C, N and P coupling in regulating PE, and underscores the need for further investigation into the effects of soil P on microbial activity and SOM decomposition.
中文翻译：
添加氮和磷通过影响高寒草甸微生物化学计量平衡介导土壤启动效应
启动效应（PE）在调节土壤有机质（SOM）的分解中起着至关重要的作用。多项实证结果表明，氮（N）和磷（P）的添加可以显着改变PE的方向和强度，从而可能显着影响草原的碳周转，尤其是对N和P富集敏感的高寒草甸。为了评估 PE 对 N 和/或 P 添加的反应，我们通过在从高寒草甸收集的土壤中添加 C 标记的葡萄糖和养分添加物（+N、+P 和 +NP）来进行孵化实验。将土壤培养 30 天，并测量土壤/微生物特性和酶活性。然后进行偏相关和线性回归分析以研究它们与 PE 的相关性。结果表明，所有处理的平均 PE 强度为 0.61 mg C g 土壤或 1.35（比率）。添加氮提高了PE强度，这归因于土壤资源和微生物需求之间更好的匹配以及酶活性的增强。然而，添加磷土壤中的PE强度低于对照土壤。这种差异可能与磷引起的氮利用率降低和更强的微生物碳氮失衡有关。没有检测到 PE 强度对 NP 添加的显着响应，这可以通过正 N 效应和负 P 效应对微生物分解的抵消来解释。在本实验中，氮或磷的添加通过调节土壤 C:N:P 比率和微生物需求之间的匹配来改变 PE 强度，这支持了化学计量分解假设。总体而言，我们的研究强调了在调节 PE 时考虑 C、N 和 P 耦合的重要性，并强调需要进一步研究土壤 P 对微生物活动和 SOM 分解的影响。
更新日期：2023-11-05
中文翻译：
添加氮和磷通过影响高寒草甸微生物化学计量平衡介导土壤启动效应
启动效应（PE）在调节土壤有机质（SOM）的分解中起着至关重要的作用。多项实证结果表明，氮（N）和磷（P）的添加可以显着改变PE的方向和强度，从而可能显着影响草原的碳周转，尤其是对N和P富集敏感的高寒草甸。为了评估 PE 对 N 和/或 P 添加的反应，我们通过在从高寒草甸收集的土壤中添加 C 标记的葡萄糖和养分添加物（+N、+P 和 +NP）来进行孵化实验。将土壤培养 30 天，并测量土壤/微生物特性和酶活性。然后进行偏相关和线性回归分析以研究它们与 PE 的相关性。结果表明，所有处理的平均 PE 强度为 0.61 mg C g 土壤或 1.35（比率）。添加氮提高了PE强度，这归因于土壤资源和微生物需求之间更好的匹配以及酶活性的增强。然而，添加磷土壤中的PE强度低于对照土壤。这种差异可能与磷引起的氮利用率降低和更强的微生物碳氮失衡有关。没有检测到 PE 强度对 NP 添加的显着响应，这可以通过正 N 效应和负 P 效应对微生物分解的抵消来解释。在本实验中，氮或磷的添加通过调节土壤 C:N:P 比率和微生物需求之间的匹配来改变 PE 强度，这支持了化学计量分解假设。总体而言，我们的研究强调了在调节 PE 时考虑 C、N 和 P 耦合的重要性，并强调需要进一步研究土壤 P 对微生物活动和 SOM 分解的影响。
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