南沙群岛景观的类型和演化

南沙群岛景观分５种类型：礁丘热带海洋生物繁生景观，环礁带海洋生物繁生景观，灰沙岛热带常绿刮灌林磷积石灰土景观，大陆架热带海海海洋生物繁生景观，深海热带大洋性和深海性海洋生物景观，这５种景观归纳为两类，一类为热带海洋景观，包括浅海和深海；另一类为热带珊瑚礁景观，下分礁丘，环礁和灰沙岛３种，南沙群岛景观类型分布和演化与古地理和现代化环境条件有关。

TYJPES AND EVOLUTION OF LANDSCAPES OF THE NANSHA ISLANDS

Landscapes of the Nansha Islands are divided imto 5 types: tropical oceanic organism breeding landscape on reef knoll like Zengmu Shoal, Wan'an Bank and so on; tropical oceanic organism breeding landscape on atoll, all dried reefs and most submerged reefs belong to this type; tropical evergreen arbor and bush forest and phosphorous lime soil landscape on limesand islet like Taiping Island, Zhongye Island, Nanwei Island, etc.; tropical shallow sea oceanic organism breeding landscape in southern shelf; and tropical oceanic organism breeding landscape in deep sea f which is distributed in waters from continental slope to deep sea basin in middle and northernpart of this region.These 5 landscapes may be classified into 2 categories, one is tropical oceanic landscape,including those in shallow and deep seas; the other is tropical coral reef landscape, including those on reef knolls, atolls and limesand isletS. The evolutional diagram of landscapeS in the Nansha Islands has been summarized in this paper. Distribution and evolution of landscape types in the Nansha Islands is related to peleogeography and modern environmental conditions.