关键词: 蔬菜地, 硝态氮, 有机物料, N₂O, N₂

Abstract: The plant community of coastal psammophytic vegetations is consisted of psammophytes and other sand-tolerating plant species. Their basic characteristics are:(1)simple species composition(40 seed plant species, belonging to 19 families and 35 genera are recorded);(2)fewer community types and less-intensive distribution;(3)life-forms being mainly geocryptophytes and annualis, which belong to two different growth forms. These vegetations are divided into two main types(herbaceous and lignosas)and 12 communities. Their successional patterns and related problems concerning their exploitation, utilization and preservation are discussed.

Key words: vegetable field, nitrate, organic material, N₂O, N₂