Assessing the likelihood of the soil surface to condense vapour: The Negev experience

Kidron, Giora J.; Kronenfeld, Rafael

doi:10.1002/eco.2200

Cited by 21 publications

(19 citation statements)

References 53 publications

(96 reference statements)

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“…Nevertheless, there were also contradictory accounts, which do not comply with the assumption that surface moistening takes place following dew. For instance, Lázaro et al (2008, p. 263) observe that during dewy mornings, the crustose lichens appear "waterproof'", which is in agreement with detailed dew measurements that were conducted in the Negev biocrusts (Kidron and Kronenfeld, 2020a). While biocrust organisms that protrude above the soil surface, such as mosses, were found to utilize dew in the Negev, the contribution of dew to cyanobacteria or crustose lichens was found to be negligible (Kidron et al, 2002).…”

Section: Introductionmentioning

confidence: 62%

“…While biocrust organisms that protrude above the soil surface, such as mosses, were found to utilize dew in the Negev, the contribution of dew to cyanobacteria or crustose lichens was found to be negligible (Kidron et al, 2002). It was postulated that either the amount is insuffi-b a cient to allow for photosynthesis or that daytime photosynthesis is too short to compensate for the nocturnal carbon loss during nocturnal respiration, subsequently resulting in a negative carbon balance (Kidron and Starinsky, 2019;Kidron and Kronenfeld, 2020a).…”

Section: Introductionmentioning

confidence: 99%

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Atmospheric humidity is unlikely to serve as an important water source for crustose soil lichens in the Tabernas Desert

Kidron

Kronenfeld

2020

Journal of Hydrology and Hydromechanics

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Dew is commonly regarded as an important water source for lichens. This is also the case for crustose lichens that are attached to the substrate, whether rocks or soil. While being verified during ample research on rock-dwelling lichens in the Negev, the findings from soil-dwelling lichens (lichen biocrusts) are not conclusive. In the Tabernas Desert, the soil surface is characterized by a lush cover of crustose lichens. These soil biocrusts (biological soil crusts) were reported to use dew for photosynthesis while, at the same time, it was also observed that these crustose chlorolichens are relatively non-wettable. In an attempt to explore the apparent controversy, two year-long meteorological data (minimum air temperature and relative humidity, RH), during which chlorolichens were thought to utilize dew for photosynthesis (2006–2007) were analyzed. The analysis includes a comparison to the meteorological conditions that prevailed in the Negev during 135 days of manual dew measurements. As found for the Negev, net photosynthesis by the chlorolichens is expected once the RH, as measured at the meteorological station, is ≥90% while vapor condensation (dew) is expected once RH is ≥95%. RH in the Negev was substantially higher than the average RH of 75.0–87.2% registered during the rainless days of 2006–2007 in the Tabernas, implying that RH in the Tabernas is too low to facilitate frequent dew formation and net photosynthesis by the lichens. Photosynthesis in the Tabernas is mainly confined to rainy periods, taking place either due to direct wetting by rain, or following vapor condensation from the subsurface (distillation). Our findings do not support the view that dew is an important water source for the establishment and growth of crustose soil lichens in the Tabernas. Moreover, the low RH in the Tabernas may also imply that dew may only have a very limited role in providing water to lithobionts in this ecosystem.

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Section: Introductionmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Atmospheric humidity is unlikely to serve as an important water source for crustose soil lichens in the Tabernas Desert

Kidron

Kronenfeld

2020

Journal of Hydrology and Hydromechanics

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“…It suggested that LWD in open habitats was at least 5 h higher than that in understorey habitats. RH of 89%–90% can keep wetness duration for up to 10.3 h every night (Kidron & Kronenfeld, 2020). Angle could control dew duration (Kidron, 2005), and measuring devices are often fixed at a 30–45° from the horizontal to measure LWD (Table 8).…”

Section: Discussionmentioning

confidence: 99%

Comparison of the performance of leaf wetness duration models for rainfed jujube (Ziziphus jujuba Mill.) plantations in the loess hilly region of China using machine learning

et al. 2020

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Leaf wetness duration (LWD) affects the ability of tree canopy to regulate ecohydrological processes. Jujube (Ziziphus jujuba Mill.) is one of the main plants with significant impact on water cycle process and flux characteristics in the Loess Plateau region of China. However, little is known about LWD in rainfed jujube plantations in the loess hilly region of China. For the causes of leaf wetness in rainfed jujube plantations, dew-only, rain and the combined scenario were investigated in terms of LWD and meteorological variables for the 2012, 2013, 2017 and 2018 jujube growing seasons. The results were as follows: The leaf wetness events occurred frequently, and the days of leaf wetness driven by dew-only and rain accounted for 88.3% of the total number of days in a regular jujube growing season. LWD driven by dew-only was significantly lower than that driven by rain (p < 0.05). The correlation between LWD and meteorological factors varied with different scenarios. In dewonly scenario, the four calibrated models (RH, DPD, CART and NN) accurately predicted LWD. In rain scenario, only the calibrated NN model performed well. In the combined scenario, the calibrated RH, CART and NN empirical models performed nearly equally; all well estimated LWD. On the basis of accuracy, practicability and variable count, the calibrated RH, NN and RH models for dew-only, rain and the combined scenario can reliably estimate LWD in rainfed jujube plantations in the loess hilly region of China.

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“…Soil water is an essential element in crop management [1][2][3]. Under natural conditions, water supplies through rainfall [4], water flux from deeper soil water like groundwater [5], incoming water flux from neighboring soil at higher soil water content [6], and fog and dew formation on the soil surface [7][8][9][10]. Human interventions such as cloud seeding [11][12][13] and water irrigation system [14] would supply water for plants' needs.…”

Section: Introductionmentioning

confidence: 99%

“…The primary purpose of water irrigation is to achieve soil moisture content within the range of FC and PWP. The difference between FC and PWP is known as PAW [8].…”

Section: Introductionmentioning

confidence: 99%

Water Infiltration into Sand, Silt, and Clay at Field Capacity

Giap

Rudiyanto

Sulaiman

2021

ARFMTS

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Field capacity (FC), permanent wilting (PWP), and plant available water (PAW) are essential parameters to estimate for soils because they are essential for water irrigation management. However, these parameters were reported in water volume per unit soil volume. Knowing the soil required water volume does not imply immediate water availability, that is, the speed at which the water could be supplied to the soil. This is because there is a lag time between water irrigation initiation and the water increment in the soil depth. This study uses the field capacity’s soil water content to simulate the water infiltration using Richards’ equation. The studied soil medium was silt, sand, and clay. The study allows an estimate of water infiltration time and infiltrated water to relate to the soil depth of interest. The clayey has the highest FC, and the silty soil has the highest PAW. The results revealed silty soil could contain more readily water for plant growth than sand and clay. This study also revealed silty soil to be a better soil medium than sand and clay. It has the best tradeoff between water infiltration time and the infiltrated amount of water for plant absorption. This study’s coupling technique will be a useful tool for farmers and field practitioners to assess any site based on the soil texture at an early stage of water irrigation investigation.

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Assessing the likelihood of the soil surface to condense vapour: The Negev experience

Cited by 21 publications

References 53 publications

Atmospheric humidity is unlikely to serve as an important water source for crustose soil lichens in the Tabernas Desert

Atmospheric humidity is unlikely to serve as an important water source for crustose soil lichens in the Tabernas Desert

Comparison of the performance of leaf wetness duration models for rainfed jujube (Ziziphus jujuba Mill.) plantations in the loess hilly region of China using machine learning

Water Infiltration into Sand, Silt, and Clay at Field Capacity

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