《长江上游黄河上中游地区2000年退耕还林(草)试点示范科技支撑实施方案》于目前发布并开始在174个试点示范县实施。退耕还林(草)试点示范工作科技支撑的目标是:实现科学规划、科学施工、科学管理,做到适地适树适草;初步建立起我国重大生态工程管理网络化系统;大力推广先进、适 The Program of Implementing Demonstration of Scientific and Technological Support for Demonstration of Conversion of Cropland to Forest (Grass) in the Upper and Middle Reaches of the Upper Yellow River in the Yellow River in 2000 was released and started to be implemented in 174 pilot demonstration counties. The goal of scientific and technological support for the pilot demonstration projects of returning farmland to forests (grasslands) is to achieve scientific planning, scientific construction and scientific management so as to be suitable for trees and grass; to initially establish a networked system of major ecological engineering management in our country; to vigorously promote advanced, suitable