“三权分置”——农村宅基地制度的重大创新(上)

正2018年中央一号文件提出,完善农民闲置宅基地和闲置农房政策,探索宅基地所有权、资格权、使用权"三权分置",落实宅基地集体所有权,保障宅基地农户资格权和农民房屋财产权,适度放活宅基地和农民房屋使用权。深刻理解"三权分置"的重大意义,正确诠释"三权分置"的法理基础,加快探索"三权分置"的实现形式,是深化农村宅基地制度改革     

4月龄大菱鲆苗种耐氨氮性状的遗传参数评估

本实验采用40个家系共计954尾大菱鲆(Scophthalmus maximus)为实验材料,应用一般动物模型评估4月龄大菱鲆的耐氨氮性状、体长、体重的遗传力和遗传相关。研究表明,4月龄大菱鲆耐氨氮性状遗传力为0.46±0.20,属于高遗传力,其估计值与0相比达到显著水平(P0.05),具备开展基于表型性状的耐氨氮选育潜力。体长遗传力为0.14±0.22,属于低遗传力;体重遗传力为0.29±0.30,属于中等遗传力;体长和体重遗传力估计值与0相比均未达到显著水平。4月龄大菱鲆耐氨氮性状、体长、体重的相关性分析表明,大菱鲆的耐氨氮性状与体长的遗传相关和表型相关分别为-0.06±0.59和-0.10±0.06;耐氨氮性状与体重的遗传相关和表型相关分别为-0.02±0.48和-0.06±0.06;耐氨氮性状与体长和体重两个性状的相关性非常低,且统计检验均不显著。研究结果表明,以耐氨氮性状为选育指标,不会对大菱鲆的体长和体重产生显著影响。该研究为大菱鲆耐氨氮品种选育提供一定的理论参考。     

黄河第一湾齐哈玛河段砾质网状河1990年以来的演变特征（英文）

The anastomosing river that is present within the First Great Bend of the Yellow River is different from other sand-bedded rivers of this type because it contains gravel-bedded materials. It is therefore important to determine whether, or not, the specific characteristics of this anastomosing river are similar to those seen in sand-bedded forms, including the characteristics of erosion and deposition, and the stability of channel and interchannel wetlands. Four Landsat images from 1990, 2001, 2013, and 2016 alongside two Google Earth(GE) images from 2011 and 2013 were utilized in this study in tandem with field sampling and observations to select a 12 km main channel length section of the Qihama reach anastomosing river. This section was then used to determine variations in channel planform and sedimentary characteristics over a 26 year period. The results of this study show that this gravel-bedded anastomosing river has exhibited a high degree of stability overall, and that there has been no obvious channel and wetland bank erosion and deposition. Data also show that over the 26 years of this study, anastomosing belt area increased by 2.43%, while the ratio of land to water area remained almost equal. The number of wetlands has also increased along this river section at a rate as high as 62.16% because of the fragmentation of some small interchannel examples, while the talweg has alternately migrated to either the left or right over long periods of time at a relatively stable rate. Indeed, as a result of the migration of this line, there has been significant turnover in the number of islands within the main channel while bank shift has occurred at a rate of about 5 m/yr. The numerous anastomosing channels within this river section remained very stable over the course of this study, characterized by a mean annual migration rate of just 1 m/yr, while the sediments in bank columnar sections are mainly composed of fine sands or silts with a relatively high clay content. The sediment grain-size distribution curve for this river section contains multiple peaks, distinct from the muddy sediments within bank columnar sections from sand-bedded anastomosing rivers. The dense vegetation within riparian and interchannel wetlands alongside this river reach has also protected anastomosing channels from erosion and maintainedtheir stability, a key feature of this gravel-bedded system.     

江苏沿海生态旅游资源开发研究

通过对江苏沿江和沿海旅游业现状和问题的对比分析,论述对江苏沿海生态旅游资源重点开发的可能性和必要性。指出对江苏沿海生态旅游资源规划的思路、客源市场选择、旅游特色项目和旅游业支持系统构建的原则等。     

丽江7级地震震区的汞量异常分析

本主要根据测汞技术在震区配合地震地质、烈度区划等项工作,目的是探测盆地内的隐伏断层。汞含量在断层上方有明显的高值异常,这已为许多基础实验所证实,在地震领域已有运用。我们这次在丽江盆地共设了六条测汞同,取得了较好的效果。一般在高烈度异常点、地裂地段、抛石块地段,汞的测值均高于背景值,达异常指标。汞的高异常往往是断层止方,从而证实发震断层在盆地内通过,而这条断层又与玉龙山前断裂的走向基本一致,说明玉     

青藏块体近期地震活动特征

本文研究了青藏块体近期地震活动两个显著的现象;中强地震自印度板块北部由南向北的地震扩展迁移现象和中强震空间分布的北东向地震条带及其相关现象,探讨了其形成的物理机制,分析了它们的发展趋势,据此对本区地震活动趋势进行了预测。     

鄂东南灵乡组的时代和侏罗系与白垩系的界线

湖北东南部沿长江流域,蕴藏着丰富的铁矿资源,因此,与其关系紧密的一套火山沉积岩系,很早就引起人们的注意。1924年谢家荣首先命名为“灵乡砂砾岩层”,以后被沿用为灵乡系、灵乡群(组)、灵乡统等名称,但对其时代归属分歧很大,从中侏罗世直到早白垩世都有(表1)。如果说我国非海相侏罗系与白垩系界线的划分争议甚大,那么