Long-term (≥20 years) application of fertilizers and straw return enhances soil carbon storage: a meta-analysis - Yu’e Li; Shengwei Shi; Muhammad Ahmed Waqas; Xiaoxia Zhou; Jianling Li; Yunfan Wan; Xiaobo Qin; Qingzhu Gao; Shuo Liu; Andreas Wilkes (Mitigation and Adaptation Strategies for Global Change, 2018)