Depth to water table is a simple, commonly used measure of hydrological function in raised bogs. The maximum depth of the water table or the average annual water table is often monitored over the long term to track the hydrological trajectory of the ecosystem. These measures, however, may not take into account the duration of the moisture deficit period. The annual water table moisture deficit (WTMD) at 67 sites in a single disturbed raised bog was calculated using the amount of time that the water table was at each depth below the surface during the moisture deficit season. The calculated value estimates a linearly developing deficit that dewaters the acrotelm during the moisture deficit season. At each site, plant species composition was assigned to one of eight plant community types. The approximate threshold above which bog plant communities will begin transitioning into drier types with taller shrubs and trees was a WTMD of 62 m‐days. An annual climatic moisture deficit (CMD) was calculated using daily air temperature, spatially interpolated precipitation and estimated potential evapotranspiration for each site. Mixed‐effects modelling of WTMD as a function CMD indicated a positive linear relation for most vegetation types, which was affected by the presence of drainage ditches, ditch blocking, fire and evapotranspiration by shrubs and trees. Tracking the WTMD and its relation to CMD may be useful for assessing ecosystem health and serve as a basis for estimating moisture deficit thresholds for bogs of conservation concern.

中文翻译：

---

植物群落类型是受干扰的沼泽中季节性水分缺乏的指标

地下水位深度是升高沼泽中水文功能的一种简单常用方法。通常会长期监测地下水位的最大深度或年平均地下水位，以追踪生态系统的水文轨迹。但是，这些措施可能没有考虑水分缺乏期的持续时间。使用在缺水季节中地下水位在地表以下每个深度处的时间量，来计算单个扰动凸起沼泽中67个位置的年地下水位水分亏缺（WTMD）。计算得出的值估计出线性发展的赤字，该赤字在缺水季节使丙烯醛脱水。在每个站点，将植物物种组成分配给八种植物群落类型之一。高于该阈值的沼泽植物群落将开始转变为具有较高灌木和树木的较干燥类型，WTMD为62 m天。使用每天的气温，空间插值的降水量和每个站点的估计潜在蒸散量来计算年度气候湿度不足（CMD）。WTMD作为CMD的函数的混合效应模型表明，大多数植被类型都具有正线性关系，这受到灌木和树木排水沟，沟渠阻塞，火和蒸散作用的影响。跟踪WTMD及其与CMD的关系可能有助于评估生态系统健康，并为估算保护性沼泽的水分亏缺阈值奠定基础。使用每天的气温，空间插值的降水量和每个站点的估计潜在蒸散量来计算年度气候湿度不足（CMD）。WTMD作为CMD的函数的混合效应模型表明，大多数植被类型都具有正线性关系，这受到灌木和树木排水沟，沟渠阻塞，火和蒸散作用的影响。跟踪WTMD及其与CMD的关系可能有助于评估生态系统健康，并为估算保护性沼泽的水分亏缺阈值奠定基础。使用每天的气温，空间插值的降水量和每个站点的估计潜在蒸散量来计算年度气候湿度不足（CMD）。WTMD作为CMD的函数的混合效应模型表明，大多数植被类型都具有正线性关系，这受到灌木和树木排水沟，沟渠阻塞，火和蒸散作用的影响。跟踪WTMD及其与CMD的关系可能有助于评估生态系统健康，并为估算保护性沼泽的水分亏缺阈值奠定基础。WTMD作为CMD的函数的混合效应模型表明，大多数植被类型都具有正线性关系，这受到灌木和树木排水沟，沟渠阻塞，火和蒸散作用的影响。跟踪WTMD及其与CMD的关系可能有助于评估生态系统健康，并为估算保护性沼泽的水分亏缺阈值奠定基础。WTMD作为CMD的函数的混合效应模型表明，大多数植被类型都具有正线性关系，这受到灌木和树木排水沟，沟渠阻塞，火和蒸散作用的影响。跟踪WTMD及其与CMD的关系可能有助于评估生态系统健康，并为估算保护性沼泽的水分亏缺阈值奠定基础。