Forests 2013, 4(4), 1106-1120; doi:10.3390/f4041106
Article

Contrasting Hydraulic Strategies during Dry Soil Conditions in Quercus rubra and Acer rubrum in a Sandy Site in Michigan

Received: 13 September 2013; in revised form: 4 November 2013 / Accepted: 3 December 2013 / Published: 11 December 2013
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Correlation analyses were carried out for the dynamics of leaf water potential in two broad-leaf deciduous tree species in a sandy site under a range of air vapor pressure deficits and a relatively dry range of soil conditions. During nights when the soil is dry, the diffuse-porous, isohydric and shallow-rooted Acer rubrum does not recharge its xylem and leaf water storage to the same capacity that is observed during nights when the soil is moist. The ring-porous, deep-rooted Quercus rubra displays a more anisohydric behavior and appears to be capable of recharging to capacity at night-time even when soil moisture at the top 1 m is near wilting point, probably by accessing deeper soil layers than A. rubrum. Compared to A. rubrum, Q. rubra displays only a minimal level of down-regulation of stomatal conductance, which leads to a reduction of leaf water potential during times when vapor pressure deficit is high and soil moisture is limiting. We determine that the two species, despite typically being categorized by ecosystem models under the same plant functional type—mid-successional, temperate broadleaf—display different hydraulic strategies. These differences may lead to large differences between the species in water relations, transpiration and productivity under different precipitation and humidity regimes.
Keywords: ecohydrology; leaf water potential; plant functional type; stomatal conductance; succession; transpiration; water relations
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MDPI and ACS Style

Thomsen, J.E.; Bohrer, G.; Matheny, A.M.; Ivanov, V.Y.; He, L.; Renninger, H.J.; Schäfer, K.V.R. Contrasting Hydraulic Strategies during Dry Soil Conditions in Quercus rubra and Acer rubrum in a Sandy Site in Michigan. Forests 2013, 4, 1106-1120.

AMA Style

Thomsen JE, Bohrer G, Matheny AM, Ivanov VY, He L, Renninger HJ, Schäfer KVR. Contrasting Hydraulic Strategies during Dry Soil Conditions in Quercus rubra and Acer rubrum in a Sandy Site in Michigan. Forests. 2013; 4(4):1106-1120.

Chicago/Turabian Style

Thomsen, Julia E.; Bohrer, Gil; Matheny, Ashley M.; Ivanov, Valeriy Y.; He, Lingli; Renninger, Heidi J.; Schäfer, Karina V.R. 2013. "Contrasting Hydraulic Strategies during Dry Soil Conditions in Quercus rubra and Acer rubrum in a Sandy Site in Michigan." Forests 4, no. 4: 1106-1120.

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