Micro-climate influence on reference evapotranspiration estimates in wetlands

Kelvin, J.; Acreman, Mike; Harding, R. J.; Hess, Tim

doi:10.1080/02626667.2015.1117089

Cited by 4 publications

(3 citation statements)

References 25 publications

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“…No such relationship is visible for the lower surface of the leaf. Wetland habitats are characterized by much higher plant transpiration rates and there is usually much more water available (Kelvin et al 2017), thus they do not need additional water sources.…”

Section: Discussionmentioning

confidence: 99%

Variation in Leaf Surface Hydrophobicity of Wetland Plants: the Role of Plant Traits in Water Retention

et al. 2017

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Leaf surface wetness has numerous physiological and ecological consequences, and the morphological structures on the leaf surface can affect its extent and duration, contributing to interception rates in the scale of the whole ecosystem. Wetland plants have developed morphological adaptations to high water level allowing them to avoid water excess. Droplet contact angle and surface free energy are measurable parameters which relate to how the plant influences water usage and redistribution. We analysed patterns of contact angle and the surface free energy of the adaxial and abaxial surface of 10 wetland plant species and related them to the optimal habitat conditions and functional traits of the plants. Despite the consistent environment of these plants, we found them to vary greatly in terms of leaf surface wettability and surface free energy, with contact angles ranging from 75 to 169°and surface free energy, from 1.32 to 30.38 mJ/m 2 . Canopy height and leaf longevity were significantly correlated to leaf wettability, whilst SLA (Specific Leaf Area) and leaf shape were not related to hydrophobicity. Investigating adaptations of wetland plants to their environment showed that including wettability and surface free energy in combination with other plant traits improves our understanding of water plant-soil-water interactions in wetland habitats.

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Section: Discussionmentioning

confidence: 99%

Variation in Leaf Surface Hydrophobicity of Wetland Plants: the Role of Plant Traits in Water Retention

et al. 2017

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“…The values for the 2015 to 2017 summer half-years are comparatively cool compared to the DWD station values; only 2018 was warmer than average even in the wet grassland areas. The overall lower temperature values are based on the well-known cooling effect that wetlands have due to their higher ET a compared to their surroundings [11,[29][30][31][32]. The annual ET 0 values at the two wet grassland sites (see Table 2) are all above the long-term median values of the DWD stations (Table 1), and in 2018, the values at the study sites are also above the long-term maximum values of the DWD stations.…”

Section: Classification Of the 2015 To 2018 Study Years In Long-term Climate Seriesmentioning

confidence: 95%

The Water Balance of Wet Grassland Sites with Shallow Water Table Conditions in the North-Eastern German Lowlands in Extreme Dry and Wet Years

Dietrich

Behrendt

Wegehenkel

2021

Water

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In recent years, Germany has experienced an increasing number of extreme wet and dry years. In the North German lowlands, wet grassland sites with shallow water table conditions are widespread landscape elements. They are characterized by a special water and nutrient balance that reacts very sensitively to changes in the hydrological system. Studies on evapotranspiration (ETa) and the development of groundwater levels were carried out at two typical wet grassland sites with shallow water table conditions. A weighable groundwater lysimeter system in the Spreewald wetland (SPW) and an eddy covariance station in Havelländisches Luch (HL) were used to measure ETa. The results show that even these shallow water table sites cannot sufficiently meet the vegetation’s water demands in extreme dry conditions. The groundwater levels drop to values deeper than 1 m below the surface. As a result, water supply to the vegetation is temporarily limited. The mean crop coefficients (Kc) of these wet grassland sites reach values of 1.1 in the vegetation period with a sufficient water supply, but drop to around 0.8 in dry years when the water supply is limited. Areas with small catchment areas, such as HL, are more seriously affected by the dry meteorological conditions than areas with sufficient inflows from larger catchment areas, such as SPW.

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“…Although wetlands account for less than 3% of the earth's total land surface, they contribute about 40% of the global ecological service value [4]. Acting as the most important carbon pool [5][6][7], wetlands are also playing the following important roles: reducing flood threats [8], regulating regional microclimates [9,10], facilitating nutrient cycles [11,12], mitigating water environment pollution [13,14], and improving water quality [15,16]. However, wetland ecosystems are now facing much more serious threats than other ecological types [17].…”

Section: Introductionmentioning

confidence: 99%

Mitigating Spatial Conflict of Land Use for Sustainable Wetlands Landscape in Li-Xia-River Region of Central Jiangsu, China

Sun

Liu

et al. 2021

Sustainability

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Li-Xia-river Wetlands make up the biggest freshwater marsh in East China. Over the last decades, social and economic developments have dramatically altered the natural wetlands landscape. Mitigating land use conflict is beneficial to protect wetlands, maintain ecosystem services, and coordinate local socioeconomic development. This study employed multi-source data and GIS-based approaches to construct a composite index model with the purpose of quantitatively evaluating the intensity of land use conflict in Li-Xia-river Wetlands from 1978 to 2018. The results showed that the percentage of the wetlands’ area declined from 20.3% to 15.6%, with an overall reduction rate of 23.2%. The mean index of land use conflict increased from 0.15 to 0.35, which suggests that the conflict intensity changed from “no conflict” to “mild conflict.” The number of severe conflict units increased by about 25 times. A conspicuous spatial variation of land use conflict was observed across different periods, although taking land for agricultural activities was the overriding reason for wetlands reduction. However, in recent years, urban sprawl has posed the greatest threat to Li-Xia-river Wetlands. Coordinating land use conflict and formulating a practical strategy are the initial imperative steps to mitigate the threat to wetlands.

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Micro-climate influence on reference evapotranspiration estimates in wetlands

Cited by 4 publications

References 25 publications

Variation in Leaf Surface Hydrophobicity of Wetland Plants: the Role of Plant Traits in Water Retention

Variation in Leaf Surface Hydrophobicity of Wetland Plants: the Role of Plant Traits in Water Retention

The Water Balance of Wet Grassland Sites with Shallow Water Table Conditions in the North-Eastern German Lowlands in Extreme Dry and Wet Years

Mitigating Spatial Conflict of Land Use for Sustainable Wetlands Landscape in Li-Xia-River Region of Central Jiangsu, China

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