落水初期三峡库区人工恢复消落带植物群落特征

Characteristics of Plant Communities in the Artificial Restoration Zone of the Three Gorges Reservoir Area in the Initial Stage of Water Falling

目的]明确三峡库区不同人工恢复消落带植物群落分布随水位高程的变化特征,为三峡库区消落带人工植被恢复提供理论依据。[方法]选取三峡库区水田坝、香溪河口、万古寺、汉丰湖、石宝镇和渠口镇6处典型人工植被修复消落带,分别于高程145~155、155~165和165~175m区域进行植物群落调查。[结果]随着水位升高,植物生物量增大,个体数量分布趋于均匀,生物多样性增高,植物优势情况趋于不明显。对比6处人工恢复消落带,发现在消落带中下部,石宝镇和香溪河口生物多样性较高;在消落带上部,汉丰湖生物多样性较高。[结论]从消落带生物多样性出发,搭配对应人工恢复措施应对长期、反复淹没的逆境条件适应性较强,可为三峡消落带的人工恢复提供一定的科学依据。

[Objective]To clarify the variation of plant community distribution with different water level elevations in different artificial restoration zones in the Three Gorges reservoir area,and to provide a theoretical basis for artificial vegetation restoration in the watershed of the Three Gorges reservoir area.[Method]Six typical artificial vegetation restoration and fading zones in Shuitianba,Xiangxi Hekou,Wangu Temple,Hanfeng Lake,Shibao Town and Qukou Town of the Three Gorges Reservoir Area were selected,respectively,at elevations of 145-155,155-165 and 165-175 m,plant community surveys were conducted in the area.[Result]With the increase of water level,plant biomass increased,the number distribution of individuals tended to be uniform,plant diversity increased,and plant superiority tended to be inconspicuous.Comparing the six artificially restored fading zones,it was found that the plant diversity in Shibao Town and Xiangxi Hekou was higher in the middle and lower part of the falling belt;in the upper part of the falling belt,the plant diversity of Hanfeng Lake was higher.[Conclusion]Starting from the diversity of plant species in the falling belt,the adaptability of the corresponding artificial restoration measures to deal with long-term and repeated flooding conditions is strong,which can provide a scientific basis for the artificial restoration of the Three Gorges falling belt.