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通过分析大连市商品住宅售价的分布情况,发现大连市居住空间分异现象已初见端倪,城市社会极化、空间隔离明显,居住空间混合居住依然存在,但尚未出现明显集聚的“富人区”和“穷人区”,居住空间分异较合理.就此对其特征及产生原因进行了综合研究,探讨居住空间分异的形成机制,认为多层次居住区分化、住宅商品化和自主性择居是大连市居住空间分异形成原因,针对大连市居住空间分异的现状特征的形成机制,采取以下调控策略：加强城郊结合部的公共基础设施建设;注重居住区的文化建设,创造多样化交往空间;采用混合居住的布局模式. 相似文献
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顺5孔的磁性地层学和早松山世的北京海侵 总被引：16，自引：0，他引：16
Vertically oriented samples collected from the care S-5 in the county of Shunyi,Beijing Plain, were measured on an astatic magnetometer, after demagnetized with a peak value of 150 or 200 Oe. The results have shown that the loose sediments up to a thickness of 640 m have recorded the Brunhes-Matuyama boundary at the depth of 160m, the Matuyama-Gauss boundary at the. depth of 468 m, and the short events corresponding to the polarity events during each epoch. 28 species of foraminiferal fossils were isolated from the sample at the depth of 428 m, 31% of this fauna is composed of planktonic foraminifera. Such an assemblage in dicates the warm, shallow-water, open-sea palaeoecological environments.According to the ages of magnetostratigraphic sequences, this marina bed composed of silts and sands with foraminiferal fossils marked by classical HyaliNea baltica,has been dated to be about 2.26 re.y, B.P., approximating the age of FAD of Hyalinea baltica in the section at Santa Maria in Italy (about 2.1 m.y.B. P). Its equivalent is also found in the other coree from the Beijing Plain. From these facts, it is postulatsd that during the early Matuyama epoch, an extensive transgression took place on the Beijing Plain. A new datum level of benthonic and planktonic foraminifera marked by the appearance of Hyalinea baltica has been found in Early Matuyama strata in the Beijing Plain. The first appearance of cold forms in the Vrica Section in Italy has been dated to be about 2:4 m.y.B.P. Based upon the up-to-date reports on calcareous nannoplankton, the interval of 2.3--1.6 m.y. is a distinet alternating stage in their evolution history. The climate in the Northern Hemisphere began to become obviously colder at about 2.5 m.y. ago. From the foregoing discussion, it is reasonable to set the Pliocene-Pleistoecne boundary in the Beijing Plain at the basal limit of the Matuyama epoch (2.43 m.y.). 相似文献
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