Effect of vegetation type and growth stage on dewfall, determined with high precision weighing lysimeters at a site in northern Germany

Xiao, Hu; Meißner, Ralph; Seeger, J.; Rupp, Holger; Borg, Heinz

doi:10.1016/j.jhydrol.2009.08.006

Cited by 59 publications

(38 citation statements)

References 34 publications

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“…The analysis shows that dew corresponds on average to 5.1% and 6.2% of the total annual amount of precipitation at Wüstebach and Rollesbroich, respectively. This is in line with previous investigations at Rollesbroich (Groh, Slawitsch, et al, 2018), Wüstebach (Groh, Stumpp, et al, 2018), and other grasslands sites under humid climate conditions, which showed that dew contributes between 4.5% and 6.9% of the total annual precipitation (Heusinger & Weber, 2015;Jacobs et al, 2006;Xiao et al, 2009). The different parameterized PM models were also used to predict dew formation.…”

Section: Water Resources Researchsupporting

confidence: 92%

Quantification and Prediction of Nighttime Evapotranspiration for Two Distinct Grassland Ecosystems

Groh

Pütz

Gerke

et al. 2019

Water Resources Research

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Evapotranspiration (ET) is, after precipitation, the second largest flux at the land surface in the water cycle and occurs mainly during daytime. Less attention has been given to water fluxes from the land surface into the atmosphere during nighttime (i.e., between sunset and sunrise). The nighttime ET (ETN) may be estimated based on models that use meteorological data; however, due to missing experimental long‐term data, the verification of ETN estimates is limited. In this paper, the amount of ETN for two grassland ecosystems was determined from highly temporally resolved and precise weighing lysimeter data. We found that annual ETN ranged between 3.5% and 9.5% of daytime annual ET (ETD) and occurred mainly during wet soil and canopy surface conditions, which suggests that ETN is largely related to evaporation. ETN was positively correlated with wind speed. Dew formation, ranging from 4.8% to 6.4% of annual precipitation, was in absolute terms larger than ETN. The prediction of ETN with the Penman‐Monteith model improved if the aerodynamic and surface resistance parameters were based on vegetation height observations and the nighttime stomatal resistance parameter was assumed to be zero. The occurrence of hot days during the observation period showed to increase average ETN rates. Our results suggest that ETN can be observed with precision weighing lysimeters, was a not negligible component in the water balance of the grassland ecosystems, and thus needs more attention when simulating land surface hydrological processes.

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Section: Water Resources Researchsupporting

confidence: 92%

Quantification and Prediction of Nighttime Evapotranspiration for Two Distinct Grassland Ecosystems

Groh

Pütz

Gerke

et al. 2019

Water Resources Research

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“…Dew is deposited when litter temperature reaches dew‐point temperature or below it. Therefore, when litter cools down faster than the air, and RH and air temperature remain high, a considerable amount of water vapor can condense on the litter, thus drastically rising LMC (Table S1; Baier, ; Jacobs et al ., ; Xiao et al ., ). Those conditions were reached at most nights in the no‐screen control in Israel, when minimum air temperature and maximum RH ranged about 17–22 °C and 92–100% (Figs S3 and S5).…”

Section: Discussionmentioning

confidence: 99%

Biotic degradation at night, abiotic degradation at day: positive feedbacks on litter decomposition in drylands

Gliksman

Rey

Seligmann

et al. 2016

Global Change Biology

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The arid and semi-arid drylands of the world are increasingly recognized for their role in the terrestrial net carbon dioxide (CO ) uptake, which depends largely on plant litter decomposition and the subsequent release of CO back to the atmosphere. Observed decomposition rates in drylands are higher than predictions by biogeochemical models, which are traditionally based on microbial (biotic) degradation enabled by precipitation as the main mechanism of litter decomposition. Consequently, recent research in drylands has focused on abiotic mechanisms, mainly photochemical and thermal degradation, but they only partly explain litter decomposition under dry conditions, suggesting the operation of an additional mechanism. Here we show that in the absence of precipitation, absorption of dew and water vapor by litter in the field enables microbial degradation at night. By experimentally manipulating solar irradiance and nighttime air humidity, we estimated that most of the litter CO efflux and decay occurring in the dry season was due to nighttime microbial degradation, with considerable additional contributions from photochemical and thermal degradation during the daytime. In a complementary study, at three sites across the Mediterranean Basin, litter CO efflux was largely explained by litter moisture driving microbial degradation and ultraviolet radiation driving photodegradation. We further observed mutual enhancement of microbial activity and photodegradation at a daily scale. Identifying the interplay of decay mechanisms enhances our understanding of carbon turnover in drylands, which should improve the predictions of the long-term trend of global carbon sequestration.

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“…Precipitation generally occurs in large (usually > 5 mm) but highly unpredictable pulses or in small but reliable and frequent forms (e.g., dewfall, fog, soil-absorbed water vapor, etc.). In desert habitats characterized by water scarcity, dewfall is crucial to maintaining water balance and can efficiently reduce water loss caused by soil evaporation (Lekouch et al, 2011;Meissner et al, 2010;Uclés et al, 2010;Xiao et al, 2009). Dewfall can also moisten and promote the development of biological soil crust (Ninari Agam and Berliner, 2002;Zhang et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Dew formation and its long-term trend in a desert riparian forest ecosystem on the eastern edge of the Taklimakan Desert in China

Hao

Liu

Guo

et al. 2012

Journal of Hydrology

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Effect of vegetation type and growth stage on dewfall, determined with high precision weighing lysimeters at a site in northern Germany

Cited by 59 publications

References 34 publications

Quantification and Prediction of Nighttime Evapotranspiration for Two Distinct Grassland Ecosystems

Quantification and Prediction of Nighttime Evapotranspiration for Two Distinct Grassland Ecosystems

Biotic degradation at night, abiotic degradation at day: positive feedbacks on litter decomposition in drylands

Dew formation and its long-term trend in a desert riparian forest ecosystem on the eastern edge of the Taklimakan Desert in China

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