简介:摘要:论文 分析了黄花滩铁矿区构造承压含水层(带) 的地质、 水文地质条件,详细分析研究了矿区 地下水的赋存 条件、地下 水化学特征 。基本查明 了矿区构造承压含水层(带) 的水文地质条件及 成因机制,通过 对其 水文地质条件及 成因机制 的深 入分析 研究,为后期矿山开发设计利用提供了水文地质条件参考依据,同时也为该类型矿区水文地质条件调查、勘查和供水水源地的勘查工作起到了借鉴指导意义。 summary : T his paper analyzes the geological and hydrogeologic conditions of the structural confined aquifer ( zone ) in Huanghuatan i ron m ining a rea, and analyzes in detail the occurrence conditions and chemical characteristics of the groundwater in the mining area. The hydrogeologic condition and the genetic mechanism of the structural confined aquifer (zone) in the mining area are basically ascertained, and the hydrogeologic condition and the geological conditions are provided for the later mine development and design by the in-depth analysis of the hydrogeologic conditions and the genetic mechanism. At the same time, it also has a reference significance for the investigation of hydrogeological conditions, and the exploration of water supply sources in this type of mining area.
简介:利用三省五县的调查数据,构建'农地确权—意愿交易价格—转入合约偏好'的理论分析框架,实证分析了农地确权对转入合约偏好的影响及其机理。研究发现:农地确权提高了农户在转入农地时选择书面合约的概率,这种提升作用可以通过交易价格机制来实现并因交易价格的高低而不同;农业生产投入越多,村庄转入交易频率越低,农户更倾向于选择口头合约;意愿从亲戚和农户那里转入农地,并且期限越短的农户更倾向于选择口头合约;家庭平均受教育程度、土地承包面积、农业收入比重等对合约偏好也有显著影响。因此,农户的转入合约偏好兼具差序格局与利益取向的双重特性。扎实推进农地确权工作、建立健全农地产权保护的制度体系,能更好地保障农户的权益。