China Agricultural University (9), Yunnan Agricultural University Chen Yongchuan (7), Yunnan Agricultural University Li Tang (7), China Academy of Sciences Cai Jianming, Geographical Science and Capital ... (7), Shaanxi Normal University Ren Zhiyuan (6), Party School of Jinan Municipal Committee of the Communist Party of China Feng Lei (6), capital university of economics and business Song Zhijun (5), Institute of Geography of China Academy of Sciences Guo Huancheng (5), Chen Sheng. Beijing Normal University (5) Hu Xijun, Central South University of Forestry and Technology (5) Zhao, Chongqing Agricultural Environmental Protection Monitoring ... (5) Yang Jirui, Sichuan University (5) Liu, Zhejiang Shaoxing Municipal Party School (5)

There are too many related theories. If you want a document, it can help you.