gullyn.小峡谷；排水沟v.在…上开沟；形成冲沟=gulley.gully control planting沟蚀防治种植gully erosion contribution沟蚀gully-stabilization works沟壑稳定工程gully area of Loess Plateau黄土高原gully erosion control forest沟道防护林gully region of locss plateau黄土沟壑区gully region of loess plateau黄土高原沟壑区gully stabilization structure沟壑稳定建筑物gully and rolling loess region黄土丘陵沟壑Gully bed neighboring to culvert涵洞沟床