区域农业生态地质调查内容与方法--以河北平原为例

区域农业生态地质调查，是我国建设可持续农业及农村经济、建设良好生态环境的重要保证。区域农业生态地质调查要以关键带的地质环境演化和对农业的影响来划分并确定调查的时段和重点，深部以编为主，浅部以验证调查为主；总体上为网膜控制，灰度界线，其工作精度由下部至上部逐步提高。以河北平原为例，划分了4个层段：地表层段，为调查重点，作为综合成果的主体；全新统上段和全新统层段，分别以洛阳铲和浅钻验证调查为主；第四系层段，开发已有资料，以编为主。综合性调查成果的主图及图例表反映调查区域的农业生态地质条件，镶图及辅表反映调查区域的农业生态地质工程区划等，剖面图辅助揭示区域农业生态地质背景条件。

AN APPROACH TO SURVEY CONTENTS AND METHODS OF REGIONAL AND AGROECOLOGICAL GEOLOGY:A CASE STUDY IN HEBEI PLAIN

The parts and key points for regional and agroecological geology survey are determined by the evolvement of geoenvironment of critical zone and its effect on agriculture.The whole work is controlled by net density.Compilation is dominated in deep part while in shallow part investigation is the basis.The accuracy of survey from deep to shallow is low to high.The result of survey and its representation should be comprehensive and dark.As a study,four parts are divided in Hebei Plain,earth surface,late Holocene,Holocene and Quaternary.Earth surface part is the principal and the keystone of the survey.While late Holocene part and Holocene part are dominated by Luoyang shovel and shallow bore survey respectively.Quaternary part is compiled based on related information.It is found that the main map and its legend reflect regional and agroecological geology,the charts and tables,the project distribution of regional and agroecological geology,and the profiles,the regional background of agroecological geology.