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水生演替的

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The reduction of species richness was the most remarkedble in Trichoptera and Mollusca. Species succession of macrozoobenthos was closely related to the changes in environmental conditions such as the isolation of the lake from the river, eutrophication, and disappearance of macrophytes. Perhaps, the latter two changes were more important.

分析表明东湖底栖动物群落的演替与湖泊环境条件的变化关系密切,这些变化主要包括:江河阻隔,湖泊富营养化的加剧以及水生高等植物的消失,其中后两个因素相对前一个显得更为重要。

The ecological water level enhanced by 30m could provide appropriate environment for hydrophytic succession of wetland plants.

研究确定的最小生态水位具有一定科学性,湿地生态水位提高30cm,能够为该区湿地植被群落的水生演替提供适宜生境。

With the deflected succession of aquatic ecotype plant functional group,the dominance of mesophytes and xerophytes increased,while the dominance of aquatic and hygric plants decreased. However,there are only planting crops in the reclaimed wetland. In the composition of plant biotype functional group,the hydrophytes reduced quickly with the deflected succession and the dominance of perennial herbs is mostly marked,and there are only annual herbs in reclaimed wetland. Compared with primary swamp,the species diversity index of meadow is the highest,the swampy meadow follows,and the reclaimed wetland is the lowest.

植物的水分生态型功能群组成随湿地的逆行演替,水生、湿生类植物功能群的优势度不断减少,中生、旱生类植物功能群的优势度逐步增加,而在垦后湿地只有农作物;植物生活型功能群组成随湿地的逆行演替,水生草本迅速减少,陆生多年生草本增加占据优势,而在垦后湿地均为一年生草本;湿地植物物种丰富度、多样性指数由原生沼泽、沼泽化草甸到草甸依次增加,草甸为最大值,而垦后湿地则最低。

The results indicated that there was an ecological succession of wetland plant communities and that the successive series is as follows: aquatic plant→helophytes→swampy prata→herbosa with the changes of habitat from aquatic to mesophytic. The horizonal distribution regularity of plant communities showed symmetric distribution at loop lake or banks of small stream and con centric distribution at depression. The vertical distribution regularity is as follows: aquatic vegetation→moor vegetation→swampy prata vegetation→subalpine meadow subalpine shrub from the center of lake to the hilltop.

结果表明,随着湿地水分由多到少的变化,植物群落类型发生相应的生态演替,其演替序列为水生植被→沼生植被→沼泽化草甸植被→草甸植被,且在水平方向呈对列式和同心圆式分布;从湖心至丘顶的垂直分布规律表现为水生植被→沼泽植被→沼泽化草甸→亚高山草甸→亚高山灌丛。

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