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作 者 ：李永宏, 刘书润, 张志诚

期 刊 ：植物生态学报 1993年 17卷 3期 页码：243-252

关键词：锡林河草甸；群落结构与生产力；DCA排序；

Keywords:Meadow, Structure and phytomass, Ordination, Xilin river,

摘 要 ：锡林河河漫滩主要草甸群落的植物组成、群落构成规律、地上植物量、群落间生态关系的研究表明：1)踏头草甸以中间型荸荠(Eleocharis intersita)、无脉苔草(Carex enervis)、巨序剪股颖(Agrostis gigantea)和湿中生杂类草共同建群，其地上植物量为445.64gDM·m-2,是该区草原群落的2—4倍；密花凤毛菊(Saussurea acuminata)杂类草草甸的地上植物量为3584.50gFM·m-2(鲜重)；马蔺(Iris lactea)杂类草草甸的地上现存量为1444.02gFM·m-2(鲜重)。2)与该区草原群落相比，草甸群落或没有单种建群植物，或单种建群植物的作用不很突出。说明了草甸优越的生境可满足多种植物共同充分生长。3)河漫滩不同草甸群落的排序表明：在积水生境中沼泽植被的外围、较为湿润的地段上分布着以莎草科植物为主的莎草(苔草)草甸；中度湿润的地段分布着以禾本科植物为主的禾草草甸；而相对较干的地段分布着以双子叶植物为主的杂类草草甸。

Abstract:Community composition, organization laws, above ground phytomass and habitat characteristics of three main meadow communities in the Xilin river flood land of Innermongolia were studied.The community, dominated by Eleocharis intersita, Carex enervis, Agrostis gigantea and mesic forbs, had a high aerial phytomass of 445.64 gDM·m-2, which was 2—4 times higher than the steppe phytomass. The aerial phytomass of Saussurea acuminata mesic forbs meadow and Iris lactea mesic forbs meadow were 3584.50gFM·m-2 and 1444.02 gFM·m-2 respectively. Meadow community had no obvious single edificator species, i. e. the edifocator had the smaller dominance in meadow than in steppe.DCA ordination of the 44 quadrats of the marsh, meadow and steppe communities shows: in the meadow habitats, the mesic forbs meadow occupied the relatively dry sites, the grasses meadow distributed on the moderate humid sites and the Cyperaceae meadow developed on the wet sites. The sites drier than that of mesic forbs meadow were occupied by meadow steppe ,while the sites wetter than that of Cyperaceae meadow are for marsh.

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