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首页> 外文学位 >An ecological assessment of the relationships between landscape structure and depressional-wetland ecosystem status along environmental gradients in Central Ohio.
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An ecological assessment of the relationships between landscape structure and depressional-wetland ecosystem status along environmental gradients in Central Ohio.

机译：俄亥俄州中部沿环境梯度景观结构与洼地-湿地生态系统状态之间关系的生态评估。

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Three different analysis techniques are used to understand better the relationships between depressional wetlands and their surrounding landscape: (1) the range of current conditions among depressional wetlands and their local environments are explored by comparing means and extreme values for physio-chemical and plant community characteristics; (2) the range of current conditions among depressional wetlands and their local environments are explored by comparing the full range (or gradient) of physio-chemical and plant community characteristics; and (3) the range of conditions over the past 60 years are explored at a single depressional wetland and compared to current plant community characteristics. The physio-chemical differences observed among these 31 wetlands suggest that the sole use of the hydrogeomorphic classification methodology may not account for ecologically distinctive differences among central Ohio's depressional wetlands and may ignore the influences of landscape factors on wetland physio-chemistry. Depressional wetlands also have distinctly different plant community characteristics; within the plant communities of depressional wetlands, taxa richness is negatively associated with mean-distance to the nearest wetland for all plant guilds except submersed wetland plants. Highly significant positive associations were also observed between the areal proportion of areas of open water in the vicinity of wetland sites and the proportion of submersed aquatic plant taxa, native submersed plant species, submersed perennial:annual ratio, and bird-dispersed submersed species at the site. Within the bird-dispersed plant guild, genus and family richness is negatively associated with the mean distance of neighboring wetlands, suggesting that bird-dispersed plant taxa may be more abundant at less isolated wetland sites. Temporal studies of a single urbanized depressional wetland suggest that severed landscape connections and habitat destruction in the recent past may be responsible for changes in the herbaceous plant community. However, there may be a time lag in the response of the woody plant community to these disturbances. The combined results of these studies have important implications for natural resource professionals who rely solely on hydrogeomorphic classifications, total plant community measurements, and current environmental conditions to assess wetland ecosystems.
机译：三种不同的分析技术被用来更好地理解抑郁湿地与其周围景观之间的关系：（1）通过比较理化和植物群落特征的平均值和极值，探索了抑郁湿地及其周围环境的当前状况范围。 ; （2）通过比较生理化学和植物群落特征的整个范围（或梯度）来探索洼地湿地及其当地环境的当前状况范围； （3）在单一的洼地湿地上探索了过去60年的条件范围，并将其与当前植物群落特征进行了比较。在这31个湿地之间观察到的理化差异表明，仅使用水文地貌分类方法可能无法解释俄亥俄州中部洼地湿地之间在生态学上的独特差异，并且可能会忽略景观因素对湿地理化的影响。抑郁湿地还具有明显不同的植物群落特征。在洼地湿地植物群落中，除淹没湿地植物外，所有植物行会的分类单元丰富度与到最近湿地的平均距离呈负相关。在湿地附近的开阔水域的面积比例与淹没的水生植物类群的比例，本地淹没的植物物种，淹没的多年生：年比和鸟类分散的淹没物种之间的比例之间也存在高度显着的正相关性。现场。在鸟类分散的植物行会中，属和家庭的丰富度与相邻湿地的平均距离呈负相关，这表明鸟类分散的植物分类群在较少的湿地位置可能更为丰富。对单个城市化洼地湿地的时间研究表明，近来切断的景观联系和生境破坏可能是导致草本植物群落发生变化的原因。但是，木本植物群落对这些干扰的响应可能会有时间滞后。这些研究的综合结果对仅依靠水文地貌分类，总植物群落测量以及当前环境条件来评估湿地生态系统的自然资源专业人员具有重要意义。

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