Study on spatial-temporal change of soil organic carbon and impact factors in Gudao Forestry Farm of DongyingShengnan Zhang, Zhanhong Liu, Luo Fang, Baolin Wu, Yurui Li and Yan NingE3S Web Conf., 118 (2019) 03014DOI: https://doi.org/10.1051/e3sconf/201911803014