Sap flow of birch and Norway spruce during the European heat and drought in summer 2003

Gartner, Karl; Nadezhdina, Nadezhda; Englisch, Michael; Čermák, Jan; Leitgeb, Ernst

doi:10.1016/j.foreco.2009.04.028

Cited by 79 publications

(54 citation statements)

References 41 publications

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“…When soil water content was sufficient, Q o and D z were the dominant factors, but soil water content was the primary factor under low soil moisture levels. Gartner et al (2009) found the same law in Norway spruce of European.…”

Section: Response Of Sap Flow To Rainfall Pulsesmentioning

confidence: 55%

Sap flow in response to rainfall pulses for two shrub species in the semiarid Chinese Loess Plateau

Jian

et al. 2016

Journal of Hydrology and Hydromechanics

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Rainfall pulses can significantly drive the evolution of the structure and function of semiarid ecosystems, and understanding the mechanisms that underlie the response of semiarid plants to rainfall is the key to understanding the responses of semi-arid ecosystems to global climatic change. We measured sap flow in the branches and stems of shrubs (Caragana korshinskii Kom. and Hippophae rhamnoides Linn.) using sap flow gauges, and studied the response of sap flow density to rainfall pulses using the "threshold-delay" model in the Chinese Loess Plateau. The results showed that the sap flow began about 1 h earlier, and increased twofold after rainfall, compared to its pre-rainfall value. The sap flow increased significantly with increasing rainfall classes, then gradually decreased. The response of sap flow was different among rainfall, species, position (branch and stem) during the pulse period, and the interactive effects also differed significantly (P < 0.0001). The response pattern followed the threshold-delay model, with lower rainfall thresholds of 5.2, 5.5 mm and 0.7, 0.8 mm of stem and branch for C. korshinskii and H. rhamnoides, demonstrating the importance of small rainfall events for plant growth and survival in semi-arid regions.

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Section: Response Of Sap Flow To Rainfall Pulsesmentioning

confidence: 55%

Sap flow in response to rainfall pulses for two shrub species in the semiarid Chinese Loess Plateau

Jian

et al. 2016

Journal of Hydrology and Hydromechanics

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“…The data which showed the highest significant correlation (R 2 and Student's t-test) between SFD drought and root zone h was used to determine the drought-stress trendline. The intersection of this trendline with the x-axis corresponds to the simulated Slope root zone water potential at maximum drought stress (SFD drought = 0) and was therefore interpreted as the permanent wilting point h 4 .…”

Section: Parameterizing the Feddes Model Using Sap Flow Datamentioning

confidence: 99%

“…Therefore, many researchers refer to the relative extractable soil water (REW) as a measure of soil water status (e.g., [4,23,[63][64][65][66]). To compare our Feddes parameters with critical REW values from the literature, we calculated the mean root-zone water contents corresponding to the reported critical REW according to the relations described by [64,66]:…”

Section: Relative Extractable Soil Water (Rew)mentioning

confidence: 99%

“…There is evidence that the shallow rooting Norway spruce is more vulnerable to drought than other species with a deeper rooting system [4,23,69]. Also, [4,25] found the sap flow activity of Norway spruce to decouple from climate variables with increasing soil water shortage.…”

Section: Water Stress Response Of Norway Sprucementioning

confidence: 99%

“…Tree water use is a key variable in forest eco-hydrological studies and closely linked to meteorological conditions and soil water availability [1][2][3][4]. To monitor the water use of individual trees, a number of methods are available [5,6].…”

Section: Introductionmentioning

confidence: 99%

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Using Sap Flow Data to Parameterize the Feddes Water Stress Model for Norway Spruce

Rabbel

Bogena

Neuwirth³

et al. 2018

Water

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Abstract:Tree water use is a key variable in forest eco-hydrological studies and is often monitored by sap flow measurements. Upscaling these point measurements to the stand or catchment level, however, is still challenging. Due to the spatio-temporal heterogeneity of stand structure and soil water supply, extensive measuring campaigns are needed to determine stand water use from sap flow measurements alone. Therefore, many researchers apply water balance models to estimate stand transpiration. To account for the effects of limited soil water supply on stand transpiration, models commonly refer to plant water stress functions, which have rarely been parameterized for forest trees. The aim of this study was to parameterize the Feddes water stress model for Norway spruce (Picea abies [L.] Karst.). After successful calibration and validation of the soil hydrological model HYDRUS-1D, we combined root-zone water potential simulations with a new plant water stress factor derived from sap flow measurements at two plots of contrasting soil moisture regimes. By calibrating HYDRUS-1D against our sap flow data, we determined the critical limits of soil water supply. Drought stress reduced the transpiration activity of mature Norway spruce at root-zone pressure heads <−4100 cm, while aeration stress was not observed. Using the recalibrated Feddes parameters in HYDRUS-1D also improved our water balance simulations. We conclude that the consideration of sap flow information in soil hydrological modeling is a promising way towards more realistic water balance simulations in forest ecosystems.

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Effects of prolonged drought on the anatomy of sun and shade needles in young Norway spruce trees

Gebauer

Volařík

Urban

et al. 2015

Ecology and Evolution

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Predicted increases in the frequency and duration of drought are expected to negatively affect tree vitality, but we know little about how water shortage will influence needle anatomy and thereby the trees’ photosynthetic and hydraulic capacity. In this study, we evaluated anatomical changes in sun and shade needles of 20‐year‐old Norway spruce trees exposed to artificial drought stress. Canopy position was found to be important for needle structure, as sun needles had significantly higher values than shade needles for all anatomical traits (i.e., cross‐sectional needle area, number of tracheids in needle, needle hydraulic conductivity, and tracheid lumen area), except proportion of xylem area per cross‐sectional needle area. In sun needles, drought reduced all trait values by 10–40%, whereas in shade needles, only tracheid maximum diameter was reduced by drought. Due to the relatively weaker response of shade needles than sun needles in drought‐stressed trees, the difference between the two needle types was reduced by 25% in the drought‐stressed trees compared to the control trees. The observed changes in needle anatomy provide new understanding of how Norway spruce adapts to drought stress and may improve predictions of how forests will respond to global climate change.

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Sap flow of birch and Norway spruce during the European heat and drought in summer 2003

Cited by 79 publications

References 41 publications

Sap flow in response to rainfall pulses for two shrub species in the semiarid Chinese Loess Plateau

Sap flow in response to rainfall pulses for two shrub species in the semiarid Chinese Loess Plateau

Using Sap Flow Data to Parameterize the Feddes Water Stress Model for Norway Spruce

Effects of prolonged drought on the anatomy of sun and shade needles in young Norway spruce trees

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