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湖北长阳清江地质公园是构造及岩溶地貌类大型地质公园,以丰富的岩溶地貌、典型的古冰川序列剖面以及罕见的古人类化石遗迹而闻名。公园内共有地层剖面、地质构造、地质地貌、化石遗迹4大类7类共100余处地质遗迹点,为研究华中西南地区地质构造演化、古地理古气候和岩溶地貌的形成机制,以及弥补古冰川序列和古人类考古学的缺陷提供了重要资源,在全球地质遗迹对比分析中具有重要意义。本文阐明了地质公园的地质遗迹特征,并从构造地质学、地层学、地貌学和古人类学等方面探讨了其地学意义,为认识公园地质遗迹状况和地质遗迹的保护开发提供科学参考。 相似文献
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Urban growth and shrinkage constitute the overall pattern of growing urbanization across the globe.Studies on urban vacant land(UVL)are few,and have proved to be mainly rudimentary and subjective.This paper first presents the definition of UVL based on bibliometric analysis.Typology,morphology,proximate causes,and the multiple functions of UVL are then analyzed at parcel,transect,city,and national levels based on an international review.Results show that UVL can be categorized by land cover,land usage,and land ownership.Worldwide,UVL has been widespread and extensive.For example,the occurrence probabilities of UVL in the cases of Guangzhou and New York are 8.46%-8.88%and 3.17%-5.08%,respectively.The average vacancy rate of residential land amounts to 11.48%in 65 U.S.cities.Generally,UVL shows fragmentation and irregular shape,and significant spatial differences exist at parcel,transect,city,and national levels.Proximate causes,such as excessive land division,irregularly shaped land parcels,decreases in resident population,deindustrialization,land speculation,insufficient investment,and environmental concerns,can all result in UVL.Currently,UVL has become a gray area of social,economic,and ecological space.However,it can also be considered a potential resource for enhancing urban sustainability.Policy implications to promote urban sustainability using monitoring,control,and differential revitalization of UVL are presented. 相似文献
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