Increase of soil organic carbon in cropland enhancing soil carbonate accumulation: a case study in the upper Yellow River Delta

Yang Guo, BNU Beijing Normal University, Beijing, China, Xiujun Wang, Beijing Normal University, Faculty of Geographical Science, Beijing, China, Xianglan Li, Beijing Normal University, Haidian, Beijing, China, Jiaping Wang, Shihezi University, College of Agriculture, Shihezi, China and Minggang Xu, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China