Effects of land clearing for agriculture on soil organic carbon stocks in drylands: A meta-analysis

To improve our understanding of clearing natural ecosystems for cropland on soil organic carbon stocks in drylands, we searched for related peer-reviewed research papers published from 1980 to 2022 on the Web of Science (https://www.webofscience.com) and the Scopus Database (https://www.scopus.com) (accessed on 30th April 2022). Then, we screened papers for integrity, relevance, and scientific merit under the following criteria: (1) We made sure all studies were independent and based on field-measured data; (2) Each study had to report paired SOC stocks of cropland and adjacent natural ecosystems with the same or a similar suite of environmental factors; (3) Studies need to explicitly present results on SOC stocks or concentrations for certain depths and areas; (4) Studies have specified the types of natural ecosystems that were converted to cropland, which are used as criteria for defining CNEC types. Finally, we winnowed results to a total of 159 scientific journal articles, comprisin...

为深化对干旱区自然生态系统转变为农田过程中土壤有机碳库（soil organic carbon stocks）变化的理解，我们于2022年4月30日检索了Web of Science（https://www.webofscience.com）和Scopus数据库（https://www.scopus.com）中1980-2022年间发表的相关同行评议研究论文。随后，我们基于完整性、相关性与科学价值三个维度，依据以下标准对文献进行筛选：（1）所有研究均为独立开展且基于实地观测数据；（2）每项研究需报告农田与相邻自然生态系统的配对土壤有机碳库（SOC stocks）数据，且两者具有相同或相似的环境因子组合；（3）研究需明确呈现特定深度与区域的土壤有机碳库或浓度结果；（4）研究需明确指出被转变为农田的自然生态系统类型，此类信息将作为定义CNEC类型（CNEC types）的依据。最终，我们筛选得到159篇符合要求的科学期刊论文，包含...