Prolonged Anaerobic Environment Weakens the Linkage Between Paddy Soil Organic Carbon (SOC) Sink and Climate Factors

We collected research articles regarding soil organic carbon (SOC) change following long-term fertilization in Chinese paddy soil. A keyword search was conducted via Web of Science, SCOPUS, and CNKI until April 2022, with search terms “long-term fertilization”, “fertilization”, “organic carbon”, “paddy”, and “rice” (and a combination of them). On aggregate, an initial of 1298 studies was obtained. The collected literature was further screened based on the following criteria. i) Only field experiments with durations longer than 3 years in China, and ii) design allowing pairwise comparison between fertilization treatments and controls (without fertilizers) were included, besides, iii) soil samples were collected during the rice season. iv) The means and the number of replicates of target variables were reported clearly. We also used WebPlotDigitizer (version 3.8) software to extract data only presented in the figures.. Based on these criteria, a total of 168 individual studies including 686 paired data of SOC were retrieved in our study.