广大劳动人民在同水土流失现象作长期斗争的过程中，已经逐渐掌握了水土流失的一些规律，认识到水土流失的自然因素是可以改变或控制的，因而创造了一些有效的治理措施，从而达到保持水土，除害兴利的目的。那么，人为因素何以能对水土保持产生积极的作用呢？首先，人为因... During the protracted struggle against the phenomenon of soil erosion, the majority of working people have gradually mastered some laws of soil and water loss and realized that the natural factors of soil and water loss can be changed or controlled, thus creating some effective measures for governance so as to achieve Maintains the soil and water, the purpose of removing the evil. So, why human factors can have a positive effect on soil and water conservation it? First of all, human due to ...