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一、前言永安盆地为一山间洼地,四周低山环绕,北为南金山,海拔568米,西北牛角顶山,海拔966米,西南猫仔鼻山,海拔669米,东南文笔山,海拔932米。盆地内地形切割较强,丘陵起伏。东部为第三纪红色地层构成的丘陵素以丹霞地貌著称;西北部以二叠系灰岩构成的岩溶区,溶洞、溶斗繁多,石芽丛生,溶蚀洼地发育。区内水系发育,燕江、沙溪贯串南北,形成条形谷地,河流两岸发育Ⅰ—Ⅲ级阶地。本区属亚热带海洋性气候,温湿多雨,年平均
Foreword Yong’an Basin is a mountain valley, surrounded by low mountains, north of South Jinshan, 568 meters above sea level, north-west horn angle top mountain, 966 meters above sea level, Southwest cats nose Mountain, 669 meters above sea level, southeast Wenbi Mountain, elevation 932 Meter. The territory of the basin cut more strongly, hilly. The eastern part of the Tertiary red stratum formed by the hilly elements known to Danxia landform; northwestern Permian limestone karst area, karst cave, a wide range of dissolution, stone bud clusters, dissolution depression development. The water system in the area is developed. The rivers of Yanjiang and Shaxi run through the north and south to form a strip-shaped valley. The Ⅰ-Ⅲ terrace is developed on both banks of the river. The subtropical zone is a maritime climate, wet and warm, humid, annual average