Evapotranspiration Mapping for Forest Management in California's Sierra Nevada

Frontiers in Forests and Global Change, Journal Year: 2020, Volume and Issue: 3

Published: June 30, 2020

We assessed the response of densely forested watersheds with little apparent annual water limitation to forest disturbance and climate variability, by studying how past wildfires changed evapotranspiration what patterns imply for availability subsurface storage drought resistance. determined spatial using a top-down statistical model, correlating measured from eddy-covariance towers across California NDVI (Normalized Difference Vegetation Index) satellite, precipitation. The study area was Yuba American River watersheds, two in northern Sierra Nevada. Wildfires 1985-2015 period resulted significant post-fire reductions at least 5 years, some cases more than 20 years. levels biomass removed medium-intensity fires (25-75% basal loss), similar magnitudes expected treatments fuels reduction health, reduced as much 150-200 mm yr-1 first Rates recovery post-wildfire confirm need follow-up intervals 5-20 years sustain lower evapotranspiration, depending on local landscape attributes interannual climate. Using metric cumulative precipitation minus (P-ET) during multi-year dry periods, we found that forests showed evidence moisture stress 1985-2018 our analysis, owing relatively small reliance meet dry-year needs vegetation. However, more-severe or sustained periods will push lower-elevation studied toward P-ET thresholds previously associated widespread mortality southern

Language: Английский

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Snowmelt causes different limitations on transpiration in a Sierra Nevada conifer forest

Agricultural and Forest Meteorology, Journal Year: 2020, Volume and Issue: 291, P. 108089 - 108089

Published: June 24, 2020

Language: Английский

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Rainfall-runoff characteristics and their threshold behaviors on a karst hillslope in a peak-cluster depression region

Journal of Hydrology, Journal Year: 2021, Volume and Issue: 605, P. 127370 - 127370

Published: Dec. 23, 2021

Language: Английский

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Bedrock Vadose Zone Storage Dynamics Under Extreme Drought: Consequences for Plant Water Availability, Recharge, and Runoff

Water Resources Research, Journal Year: 2022, Volume and Issue: 58(4)

Published: April 1, 2022

Abstract Bedrock vadose zone water storage (i.e., rock moisture) dynamics are rarely observed but potentially key to understanding drought responses. Exploiting a borehole network at Mediterranean blue oak savanna site—Rancho Venada—we document how capacity in deeply weathered bedrock profiles regulates woody plant availability and groundwater recharge. The site is the Northern California Coast Range within steeply dipping turbidites. In wet year (water 2019; 647 mm of precipitation), moisture was quickly replenished characteristic capacity, recharging that emerged springs generate streamflow. subsequent rainless summer growing season, depleted by about 93 mm. two years followed (212 121 precipitation) total amount gained each winter 54 20 mm, respectively, declines were documented exceeding these amounts, resulting progressively lower content. Oaks, which rooted into bedrock, demonstrated signs stress drought, including reduced transpiration rates extremely low potentials. 2020–2021 precipitation did not exceed variable belowground storage, increased stress, no recharge or runoff. Rock deficits (rather than soil deficits) explain

Language: Английский

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Tree growth responses to extreme drought after mechanical thinning and prescribed fire in a Sierra Nevada mixed-conifer forest, USA

Forest Ecology and Management, Journal Year: 2022, Volume and Issue: 510, P. 120107 - 120107

Published: Feb. 25, 2022

Language: Английский

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