黄河三角洲贝壳堤岛脆弱生态系统破坏现状及保护对策

黄河三角洲的无棣、沾化海岸数千年来形成的贝壳堤为世界三大古贝壳堤之一。近20多年来，贝壳堤岛脆弱生态系统受到严重破坏，主要表现在面积锐减，生物多样性降低。究其原因，一是风暴潮袭击、海岸侵蚀等自然因素影响，二是滥挖贝壳砂、无序发展盐业生产和滩涂养殖、修筑防潮大坝、兴建工业企业和民居等人为因素破坏。保护贝壳堤岛生态系统，要强化该国家级自然保护区建设与管理，尽快修复脆弱生态系统，加强自然保护区科学研究，还要加大自然保护宣传力度。

Current Status of Vulnerable Ecosystem of Shell Islands and Protection Measures in Yellow River Delta

The shell levees on coast of Wudi and Zhanhua in Yellow River delta are one of the three major shell levees in the world.In recent two decades,severe destroy of vulnerable ecosystem was taken place in this area.The area of shell levees decreased sharply and biodiversity reduced.These changes were caused not only by natural factors,i.e.,storm tide attract and coast erosion,but also by human activities,i.e.,shell sand transportation,out-of-order salt production,beach breeding,dike construction,industrial deve...