Evaluation of Habitat Preferences of Invasive Macrophyte Egeria densa in Different Channel Slopes Using Hydrogen Peroxide as an Indicator
Evaluation of Habitat Preferences of Invasive Macrophyte Egeria densa in Different Channel Slopes Using Hydrogen Peroxide as an Indicator
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DOI：
10.3389/fpls.2020.00422
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发表时间：
2020-04-30
影响因子：
5.6
通讯作者：
Vamsi Krishna, Lekkala
中科院分区：
文献类型：
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作者：
Asaeda, Takashi;Senavirathna, M. D. H. Jayasanka;Vamsi Krishna, Lekkala
密枝石楠（Egeriadensa）是日本常见的外来入侵植物，近20年来，它在没有水生植物的河流中大面积扩散，导致这些河流生态系统已被密枝石楠（Egeriadensa）所控制。密度。E.在不同的条件下，在河流和实验室条件下，使用过氧化氢（H2 O2：一种活性氧）的组织浓度研究了密集的菌落形成。建立了描述不同流速和光照条件下水生植物组织H_2O_2生成的经验方程。暗适应植物的H2 O2浓度与水流速度成正比，光照条件下过剩的H2 O2浓度对应于光系统产生的H2 O2。当H2 O2浓度超过16 μ mol/gFW时，植物组织开始恶化，生物量下降，表明植物长期存活所需的临界值。经验获得的流速或光强度之间的关系和H2 O2浓度的分析不同的斜率和深度的通道发现，H2 O2值超过临界H2 O2浓度在通道中的1/100以上，在约0.6米的深度。这与在坡度超过1/100的渠道中没有发现菌落的观察结果一致，并且生物量浓度在0.6至0.8 m的深度处最大。H_2O_2浓度的测定对了解水生植物的生长状况有一定的应用价值。
Egeria densa is an often-found invasive species in Japan, which has spread widely in the past two decades in rivers where no macrophytes had previously been found. As a result, these ecosystems have now become dominated by E. densa. The habitat preference for E. densa colony formation was investigated using the tissue concentrations of hydrogen peroxide (H2O2: a reactive oxygen species) under varying conditions in rivers and laboratory conditions. The empirical equations that can describe the macrophyte tissue H2O2 formation under various velocity and light conditions were produced. The H2O2 concentrations of dark-adapted plants are proportional to the flow velocity, and the surplus H2O2 concentration in the light-exposed condition corresponded to the photosystems produced H2O2. When the H2O2 concentration exceeds 16 mu mol/gFW, plant tissue starts to deteriorate, and biomass declines, indicating the critical values required for long-term survival of the plant. The empirically obtained relationships between flow velocity or light intensity and the analysis of H2O2 concentration for different slopes and depths of channels found that the H2O2 value exceeds the critical H2O2 concentration in channels with above 1/100 at around 0.6 m depth. This agrees with the observed results where colonies were not found in channels with slopes exceeding 1/100, and biomass concentration was the largest at depths of 0.6 to 0.8 m. H2O2 concentration is quite applicable to understanding the macrophyte condition in various kinds of macrophyte management.