喜旱莲子草对喀斯特三种不同生境的可塑性反应

喜旱莲子草自入侵以来在我国各地广为传播蔓延,对人们生产生活产生了重要影响。该研究通过野外采样和室内理化指标分析,探讨喀斯特不同生境中喜旱莲子草的可塑性。结果表明:(1)在三种生境中喜旱莲子草的节间长度、叶面积、单株重和叶干重差异显著。(2)在岩石环境中其无性繁殖器官——茎的投入比例占其生物量的比例最大,其次是行道生境和湘江河道。(3)节间距随环境因子从岩石环境、绿化行道和水生生境的变化,依次增加,叶质比(叶面积/质量)也随水分环境的增加而增加;(4)在岩石环境中,喜旱莲子草通过缩短节间距并增加无性繁殖器官——茎的质量来增加其在水分匮乏生境的繁殖能力。该研究结果为喜旱莲子草今后的防治对策提供了科学依据。

Plasticity of Alternanthera philoxeroides in response to three karst habitats

Since the invasion of Alternanthera philoxeroides around in our country since the widely spread, has an important impact on the production and life of the people. Plasticity is an important feature of invasive plants, we studied indexs of plasticity A. philoxeroides providing scientific basis for the prevention and cure in different habitats. The results were as follows:(1)There were obvious differences in internode length, leaf area per plant, total weight and leaf dry weight of A. philoxeroides in rock environment, road and aquatic habitats.(2)Asexual reproduction organs of stem biomass was the largest in rock environment, followed by the road and the river habitat.(3)Internode and leaf area of A. philoxeroides increased with the rock, road and aquatic environment.(4)In the lack of water rocks environment, A. philoxeroides increased reproduction by short internode and increase the mass.