secondary plot

The paper analyzed and studied the regional geography, landforms, hydrological characteristics, soil erosion characteristics and the cause of soil erosion on the basis of investigation, experiment and observation on large scale in the No.

在对黄土丘陵沟壑区第一副区进行大量的观测、试验和调查的基础上，分析研究了其区域地理地貌、水文特性、土壤侵蚀特征以及水土流失状况。