Species differences in the seasonality of evergreen tree transpiration in a Mediterranean climate: Analysis of multiyear, half‐hourly sap flow observations

Link, Percy; Simonin, Kevin A.; Maness, H.; Oshun, J.; Dawson, Todd E.; Fung, Inez

doi:10.1002/2013wr014023

Cited by 67 publications

(80 citation statements)

References 63 publications

(109 reference statements)

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“…These facts make forest thinning or prescribed burning seem like possible approaches to streamflow enhancement. However, summer transpiration, especially by Douglas fir, appears to be largely water-limited in the region (Link et al 2014). Thinning projects 25 may simply improve the water balance of the remaining trees on the landscape (Otero et al 2010).…”

Section: Discussionmentioning

confidence: 99%

“…Thinning projects 25 may simply improve the water balance of the remaining trees on the landscape (Otero et al 2010). Differences in water use among species, which include seasonality of transpiration and use of water from different strata (Link et al 2014) add further complications to forest manipulation intended to increase streamflow.…”

Section: Discussionmentioning

confidence: 99%

“…Dry season transpiration in the Mattole has been estimated at 0.5 mm day -1 (Stubblefield et al 2012), with estimates from the adjacent Eel River basin at 1-2 mm day -1 (Link et al 2014). …”

Section: Basin Characteristics and Baseflows 20mentioning

confidence: 99%

“…The hydraulic conductivity of the different portions of the regolith (Link et al 2014, Zwieniecki andNewton 1996). Douglas fir water use peaks in spring and decreases throughout the dry season in response to water stress, while Madrone (Arbutus) transpiration reaches a maximum in late summer (Link et al 2014). …”

Section: Introductionmentioning

confidence: 99%

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Spatial and Temporal Variability in Baseflow in the Mattole River Headwaters, California, USA

Queener¹,

Stubblefield

2016

Preprint

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Abstract.Increases in human population, water use, and climate change have the potential to increase water stress and scarcity particularly in ecosystems with pronounced seasonality in precipitation, yet our understanding of the landscape features that control baseflows remains limited. Repeated synoptic measurements of streamflow in small streams (basin area 10 . Unit-area yields varied widely, and this variation increased as flows declined at most sites. In nested basins, downstream declines in both discharge and unit-area yield were common. Basins with greater summer flow and a slower baseflow 15 recession had steeper slopes, higher elevations, less flat ground and narrower valleys, more dissected and strongly convergent topography, and more precipitation. The difference in water yield among basins was much greater than the difference in precipitation, likely resulting from varying basin water inputs, storage capacity, and routing. The positive correlation between basin steepness and flow is attributable to the thickness of the weathered bedrock layer in water storage, and more rapid bedrock weathering in steeper basins with higher rates of uplift resulting in greater basin storage capacity. 20Results show that basins in a small geographic area (<85 km 2 ) and with fairly similar geology, vegetation, and topography may generate widely differing baseflow. Streams with naturally low baseflows are particularly susceptible to water diversion. Low-gradient streams essential for coho salmon rearing may be particularly susceptible to climate change or water diversions that reduce streamflow. 25

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Basin Characteristics and Baseflows 20mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatial and Temporal Variability in Baseflow in the Mattole River Headwaters, California, USA

Queener¹,

Stubblefield

2016

Preprint

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“…Subsequent rain in the winter advances a wetting front through the weathered bedrock zone and delivers water to a dynamic, fractured controlled groundwater response system (Salve et al, 2012). Graduate student led research has been initiated on: (1) prediction of the Critical Zone develop ment (Rempe and Dietrich, 2014); (2) dynamics of runoff and rock moisture availability to the forest canopy (Oshun et al, 2012); (3) chemical evolution of water and gasses through the Critical Zone (Kim et al, 2012(Kim et al, , 2014; and (4) influence of vegetation on regional climate (Link et al, 2014).…”

Section: Figure 225 Location Of Rivendell Site On Elder Creek (Rightmentioning

confidence: 99%

The Role of Critical Zone Observatories in Critical Zone Science

White¹,

Brantley²,

Banwart³

et al. 2015

Developments in Earth Surface Processes

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Toward a new parameterization of hydraulic conductivity in climate models: Simulation of rapid groundwater fluctuations in Northern California

Vrettas

Fung

2015

J Adv Model Earth Syst

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Preferential flow through weathered bedrock leads to rapid rise of the water table after the first rainstorms and significant water storage (also known as ''rock moisture'') in the fractures. We present a new parameterization of hydraulic conductivity that captures the preferential flow and is easy to implement in global climate models. To mimic the naturally varying heterogeneity with depth in the subsurface, the model represents the hydraulic conductivity as a product of the effective saturation and a background hydraulic conductivity K bkg , drawn from a lognormal distribution. The mean of the background K bkg decreases monotonically with depth, while its variance reduces with the effective saturation. Model parameters are derived by assimilating into Richards' equation 6 years of 30 min observations of precipitation (mm) and water table depths (m), from seven wells along a steep hillslope in the Eel River watershed in Northern California. The results show that the observed rapid penetration of precipitation and the fast rise of the water table from the well locations, after the first winter rains, are well captured with the new stochastic approach in contrast to the standard van Genuchten model of hydraulic conductivity, which requires significantly higher levels of saturated soils to produce the same results. ''Rock moisture,'' the moisture between the soil mantle and the water table, comprises 30% of the moisture because of the great depth of the weathered bedrock layer and could be a potential source of moisture to sustain trees through extended dry periods. Furthermore, storage of moisture in the soil mantle is smaller, implying less surface runoff and less evaporation, with the proposed new model.

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Species differences in the seasonality of evergreen tree transpiration in a Mediterranean climate: Analysis of multiyear, half‐hourly sap flow observations

Cited by 67 publications

References 63 publications

Spatial and Temporal Variability in Baseflow in the Mattole River Headwaters, California, USA

Spatial and Temporal Variability in Baseflow in the Mattole River Headwaters, California, USA

The Role of Critical Zone Observatories in Critical Zone Science

Toward a new parameterization of hydraulic conductivity in climate models: Simulation of rapid groundwater fluctuations in Northern California

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