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中文摘要：
根据野外调查及相关资料,分析了长江三角洲地区水生植物区系的种类组成、地理成分以及濒危现状。该区现有水生维管植物39科90属185种,其生活型以挺水植物为主（占64.32%）,主要分布于田边沟渠、农田以及池塘等不同水体。属、种等级的地理成分分析结果表明：其区系性质主要为温带性质。根据水生植物的濒危现状,参照世界自然保护联盟（IUCN）红色名录的等级和标准（3.1版本）,将该区的植物分为9大类,其中地区性灭绝1种,极危种3种,濒危种8种,易危种10种,并简要讨论了该区水生植物受威胁的主要原因。
英文摘要：
Based on field investigation and literature survey,the species composition,geographical elements,and endangered state of aquatic vascular plants in the Yangtze Delta were analyzed.We found 185 wild species belonging to 90 genera and 39 families in this area,most of which were distributed in habitats such as ditches,rice-fields,and ponds.Additionally,emergent plants were the main type in terms of life form.This flora was chiefly temperate in nature according to areal-type analysis both at the level of genera and of species.In light of IUCN Red List Categories and Criteria（Edition 3.1）,those species were classified into 9 types,including Regionally Extinct（RE） 1,Critically Endangered（CR） 3,Endangered（EN） 8,and Vulnerable（VU） 10.Finally,we also examined the main reasons causing these aquatic plants to become threatened.
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