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The use of regional and alluvial groundwater by riparian trees in the wet‐dry tropics of northern Australia
Hydrological Processes ( IF 2.8 ) Pub Date : 2021-04-18 , DOI: 10.1002/hyp.14180 Caroline A. Canham 1 , Clément Duvert 2 , Leah S. Beesley 1 , Michael M. Douglas 1 , Samantha A. Setterfield 1 , Fiona L. Freestone 1 , Steven Clohessy 3 , Robyn C. Loomes 3
Hydrological Processes ( IF 2.8 ) Pub Date : 2021-04-18 , DOI: 10.1002/hyp.14180 Caroline A. Canham 1 , Clément Duvert 2 , Leah S. Beesley 1 , Michael M. Douglas 1 , Samantha A. Setterfield 1 , Fiona L. Freestone 1 , Steven Clohessy 3 , Robyn C. Loomes 3
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Riparian trees play a critical role in the ecological function of rivers, yet are threatened by anthropogenic change to the hydrological cycle. Identifying the sources of water used by riparian trees can inform sustainable water policy. We used isotopic analysis complemented by measurements of plant water relations to assess water sources for riparian trees at two sites with contrasting hydrogeological processes; one with an alluvial aquifer overlaying an aquitard, and one where fault‐induced preferential pathways in the aquitard allowed the flow of deeper, older groundwater from a regional aquifer to the alluvium. At both sites, plant water potential, stomatal conductance, and plant water isotope composition in the xylem sap of riparian trees were collected from two landscape positions, the riverbank and floodplain. We used a Bayesian mixing model (MixSIAR) to assess differences in the proportion of water sources for sites and landscape positions. We found that xylem water isotope values differed between the two sites in line with their hydrogeological characteristics, with trees at the regional aquifer site using water sourced from the regional groundwater and trees at the site with only an alluvial aquifer present using a mixture of water sources, with no dominant source identified. Higher plant predawn water potential values at the regional site indicated greater water availability and support the inference that plants were using more groundwater at the regional site compared to the alluvial site. Trees closer to the river had higher isotope values, indicative of surficial water sources i.e. shallow soil water and river water. Our findings show that the water sources used by riparian trees reflect local hydrogeology and resource availability. Water managers should identify and protect plant water sources to ensure maintenance of riparian trees.
中文翻译：
澳洲北部湿干热带地区河岸树木对区域和冲积地下水的利用
河岸树木在河流的生态功能中起着至关重要的作用，但受到人为变化对水文循环的威胁。确定河岸树木所使用的水源可以为可持续水政策提供依据。我们使用同位素分析并辅以植物水关系的测量，以评估两个地点的河岸树木的水源，这些地点的水文地质过程相反。一种是在冲积层上覆盖了一个脱水层，另一种是由断层引起的优先通道在该脱水层中使较深的较旧的地下水从区域性含水层流到了冲积层中。在这两个地点，从河岸和洪泛区两个景观位置收集了河岸树木木质部汁液中的植物水势，气孔导度和植物水同位素组成。我们使用贝叶斯混合模型（MixSIAR）来评估场地和景观位置的水源比例的差异。我们发现，两个地点的木质部水同位素值因其水文地质特征而异，区域含水层地点的树木使用的是区域地下水，而该地点的树木中只有冲积含水层的使用了混合水，没有确定主要来源。该区域地点较高的植物黎明前水势值表明有更多的水，并支持与冲积地点相比植物在该区域地点使用了更多地下水的推断。靠近河流的树木具有较高的同位素值，表明表层水源，即浅层土壤水和河水。我们的发现表明，河岸树木使用的水源反映了当地的水文地质和资源可用性。水资源管理者应识别和保护植物水源，以确保河岸树木得到维护。
更新日期：2021-05-17
中文翻译：
澳洲北部湿干热带地区河岸树木对区域和冲积地下水的利用
河岸树木在河流的生态功能中起着至关重要的作用，但受到人为变化对水文循环的威胁。确定河岸树木所使用的水源可以为可持续水政策提供依据。我们使用同位素分析并辅以植物水关系的测量，以评估两个地点的河岸树木的水源，这些地点的水文地质过程相反。一种是在冲积层上覆盖了一个脱水层，另一种是由断层引起的优先通道在该脱水层中使较深的较旧的地下水从区域性含水层流到了冲积层中。在这两个地点，从河岸和洪泛区两个景观位置收集了河岸树木木质部汁液中的植物水势，气孔导度和植物水同位素组成。我们使用贝叶斯混合模型（MixSIAR）来评估场地和景观位置的水源比例的差异。我们发现，两个地点的木质部水同位素值因其水文地质特征而异，区域含水层地点的树木使用的是区域地下水，而该地点的树木中只有冲积含水层的使用了混合水，没有确定主要来源。该区域地点较高的植物黎明前水势值表明有更多的水，并支持与冲积地点相比植物在该区域地点使用了更多地下水的推断。靠近河流的树木具有较高的同位素值，表明表层水源，即浅层土壤水和河水。我们的发现表明，河岸树木使用的水源反映了当地的水文地质和资源可用性。水资源管理者应识别和保护植物水源，以确保河岸树木得到维护。
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