Simulated acid rain offset a warming-induced increase in soil respiration but did not impact the temperature sensitivity of soil respiration in a cropland

• Published in: Applied soil ecology : a section of Agriculture, ecosystems & environment ecosystems & environment, 2021-08, Vol.164, p.103936, Article 103936
• Main Authors: Chen, Shutao, Zhang, Xu, Sang, Lin, Sun, Lu, Wu, Jing
• Format: Article
• Language: English
• Subjects: Simulated acid rain; Soil respiration; Temperature sensitivity; Warming
• ISSN: 0929-1393; 1873-0272
• DOI: 10.1016/j.apsoil.2021.103936

Investigating the effects of warming and simulated acid rain on soil respiration and its temperature sensitivity is crucial in predicting the potential responses of soil C cycles to future climate warming. A three-year field experiment with six treatments (CK, WA, CK-4.0, WA-4.0, CK-2.0 and WA-2.0) of warming (coded as WA) and three simulated acid rain levels (coded as CK, pH 4.0 and pH 2.0) was performed in an annual winter wheat–soybean cropland to study the comprehensive effects of warming and simulated acid rain on soil respiration and its temperature sensitivity. The results indicated that warming significantly (P  0.05). Warming induced a significant (P  0.05) impact the Q10 of soil respiration. •Warming significantly increased soil respiration under no or low acid rain load.•Intensive simulated acid rain (pH 2.0) offset the warming effects on soil respiration.•Warming induced a significant decrease in the Q10 of soil respiration.