1. Zhao Guangju. Evolution of soil erosion environment and historical changes of water and sediment in Yellow River in Loess Plateau and countermeasures [J]. Bulletin of Soil and Water Conservation, 2017,37(02):351.
2. He Chunxiong. Current situation, characteristics and functions of Zhigou land reclamation project in Yan 'an [J]. Journal of Earth Environment, 2015, 6(4):255-260.
3. Liu Zhe, Gao Xiao, Wang Huanyuan. Effect of land reclamation Project on soil quality and soil structure in Yan 'an: A case study of Yangwan Ditch Reclamation Project in Nanniwan Town [J]. Western Development (Land Development Engineering Research), 2019, 4(02): 34-38.
4. Dong Qiguang, Wang Huanyuan, Luo Lintao. Distribution characteristics of soil nutrients in Zhigou farmland on the Loess Plateau [J]. Western Development (Land Development Engineering Research), 2019, 4(08): 59-63.
5. He J, Han X. Ecological stoichiometry:searching for unifying principles from individuals to ecosystems[J].Chinese Journal of Plant Ecology,2010,34(1):2-6.