利用地形图进行梯田规划的技术探讨

<正> 水平梯田是控制坡面水土流失,实现农业稳产高产的根本措施。为了达到梯田建设的规模化、标准化、优质化,梯田规划也应相应地从经验的定性方法向多目标定量化发展。 梯田规划必须是在合理利用土地资源,山、水、田、林、路综合治理基础上进行的全面规划。利用地形图、结合现状图进行梯田规划,能够直接从图面获得一些定量化的指标,促进梯田规划实现定量化、标准化。本文主要探讨运用地形图进行梯田规划的一些技术性问题。

Technique in the Planning of Terraced Fields with Topographic Maps

Planning of terraced fields includes the planning of cultivation areas, roads and fields. In accordance with the topographic and geomorphologic characteristics represented in topographic maps, terraced fields are planned to be placed in adjacent cultivation areas with a slope of 5 to 25 degrees not subject to erosion . The appropriate area of each block of field is 50 -100 mu.Planning for roads is mainly to determine the location,the direction,number and length.The design longititudinal slope of the road should be not more than 11 % . When the slope varies within 11% to 14%, the successive length of the sloping road should not be over 20m. This paper presents the method or calculation for the length and layout of the road , and also explores the optimum slope length and appropriate slope width with best economic & ecological benefits and less investment.