Wang Ruifang<sup>1</sup>,Qin Baishun<sup>2</sup>,Huang Chengzhi<sup>1</sup>,Zhang Hulin<sup>1</sup>, Chang Dandong<sup>2</sup>,Dong Yuting<sup>1</sup>,Zhao Liyi<sup>1</sup>
1.The Tianshui Experimental station on Soil and Water Conservation of Yellow River Conservancy Committee,741000,Tianshui,Gansu;2.Monitor Center of Soil and Water Conservation,Ministry of Water Resources,100053,Beijing: China