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Wetland Vegetation Response to Groundwater Pumping and Hydrologic Recovery
Wetlands ( IF 2 ) Pub Date : 2020-10-10 , DOI: 10.1007/s13157-020-01383-5
Megan K. Bartholomew , Christopher J. Anderson , Jacob F. Berkowitz

An investigation of wetland vegetation response to groundwater alteration was conducted at the J.B. Starkey Wilderness Park, a large municipal wellfield in the area of west Florida, USA. Decades of historic groundwater withdrawal had created a gradient of impacted wetlands on the wellfield, after which time the groundwater pumping rates were reduced. Nineteen cypress dome wetlands were grouped, based on their hydrologic histories, as either most-altered (least inundation), marginally-altered (intermediate inundation), or least-altered (near-normal inundation). Annual species–level monitoring data were used to evaluate understory plant community response to the hydrologic recovery that resulted from reduced groundwater pumping. Species richness, cover, prevalence index (PI), and species importance percentages were assessed during pre- (2005–2007) and post- (2012–2014) hydrologic recovery periods. The vegetation in marginally- and most-altered wetlands responded to hydrologic recovery with increased species richness and lower PI values (i.e., greater hydrophytic character). However, species importance percentages indicated greater variation in the recovery of most-altered wetlands, where species composition often remained different from least-altered wetlands. Although reductions in groundwater pumping caused sufficient passive hydrologic recovery to elicit a vegetation response, further reductions and/or more time may be needed before the vegetation of some altered wetlands can become comparable to that of least-impacted wetlands.



中文翻译:

湿地植被对地下水抽取和水文恢复的响应

在美国西佛罗里达地区的大型市政井场JB Starkey Wilderness Park进行了对湿地植被对地下水变化的响应的调查。几十年的历史性地下水抽取在井场上造成了受影响湿地的梯度,此后降低了地下水抽水率。根据其水文历史,将19个柏树穹顶湿地分为最大变化(最少淹没),轻微变化(中等淹没)或最小变化(接近正常淹没)。年度物种级别的监测数据用于评估地下植物群落对地下水泵减少导致的水文恢复的反应。物种丰富度,覆盖率,流行指数(PI),在2005-2007年之前(2012-2014年)和之后(2012-2014年)水文恢复期间评估了物种的重要性百分比。边际和变化最大的湿地上的植被对水文恢复的反应是物种丰富度增加和PI值降低(即水生植物性状增强)。但是,物种重要性百分比表明,变化最大的湿地的恢复变化更大,那里的物种组成通常与变化最小的湿地保持不同。尽管地下水泵送的减少导致足够的被动水文恢复以引起植被响应,但在某些改变后的湿地的植被变得与受影响最小的湿地相当之前,可能需要进一步减少和/或花费更多时间。边际和变化最大的湿地上的植被对水文恢复的反应是物种丰富度增加和PI值降低(即水生植物性状增强)。但是,物种重要性百分比表明,变化最大的湿地的恢复变化更大,那里的物种组成通常与变化最小的湿地保持不同。尽管地下水泵送的减少导致足够的被动水文恢复以引起植被响应,但在某些改变后的湿地的植被变得与受影响最小的湿地相当之前,可能需要进一步减少和/或花费更多时间。边际和变化最大的湿地上的植被对水文恢复的反应是物种丰富度增加和PI值降低(即水生植物性状增强)。但是,物种重要性百分比表明,变化最大的湿地的恢复变化更大,那里的物种组成通常与变化最小的湿地保持不同。尽管地下水泵送的减少导致足够的被动水文恢复以引起植被响应,但在某些改变后的湿地的植被变得与受影响最小的湿地相当之前,可能需要进一步减少和/或花费更多时间。物种重要性百分比表明,变化最大的湿地的恢复变化更大,那里的物种组成通常与变化最小的湿地保持不同。尽管地下水泵送的减少导致足够的被动水文恢复以引起植被响应,但在某些改变后的湿地的植被变得与受影响最小的湿地相当之前,可能需要进一步减少和/或花费更多时间。物种重要性百分比表明,变化最大的湿地的恢复变化更大,那里的物种组成通常与变化最小的湿地保持不同。尽管地下水泵送的减少导致足够的被动水文恢复以引起植被响应,但在某些改变后的湿地的植被变得与受影响最小的湿地相当之前,可能需要进一步减少和/或花费更多时间。

更新日期:2020-10-11
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