Soil microstructure as an under-explored feature of biological soil crust hydrological properties: case study from the NW Negev Desert

Felde, Vincent J.M.N.L.; Peth, Stephan; Uteau, Daniel; Drahorad, Sylvie; Felix‐Henningsen, Peter

doi:10.1007/s10531-014-0693-7

Cited by 82 publications

(51 citation statements)

References 64 publications

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“…17 by Chamizo et al). In the northwest Negev Desert, Felde et al (2014) showed that biocrust developmental stage greatly affected the soil pore system and influenced water redistribution. In the context of climate change, these patterns show biocrust composition and cover could play a critical role in affecting soil moisture and mitigating (or exacerbating) dryland soil moisture responses to climate change.…”

Section: Precipitationmentioning

confidence: 99%

Biocrusts in the Context of Global Change

et al. 2016

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A variety of global environmental changes-including increased temperature, altered precipitation regimes, increased nutrient deposition, and elevated atmospheric CO 2 concentrations-are affecting ecosystems worldwide, and drylands are no exception. Multiple lines of evidence suggest that arid and semiarid ecosystems may experience particularly large changes in climate (IPCC 2013;Garfin et al. 2014) and that interactions among global change factors (e.g., elevated CO 2 Â warming) could have strong synergistic effects in these ecosystems (Shaw

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Section: Precipitationmentioning

confidence: 99%

Biocrusts in the Context of Global Change

et al. 2016

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“…When the surface is gradually covered by deposits, top crust organisms tend to move upward and recolonize at the new surface (e.g. Garcia-Pichel and Pringault, 2001;Jia et al, 2008), leaving old materials buried into the subcrust (Felde et al, 2014). On the other hand, the debris left to soil surface is exposed to photodegradation.…”

Section: J Gong Et Al: Modelling the Diurnal And Seasonal Dynamicsmentioning

confidence: 99%

“…The C sequestration of biocrust can be strongly modified by microbial communities directly (Belnap et al, 2003;Pointing and Belnap, 2012;Feng et al, 2014;Maestre et al, 2015) and through other factors, e.g. surface albedo (Chamizo et al, 2012), dew falls (Liu et al, 2006) and soil pore formation (Williams et al, 2012;Felde et al, 2014). So far, many questions remain unanswered about the mechanisms that control the colonization, adaption and succession of microbial communities and the structure function of biocrust (Pointing and Belnap, 2012).…”

Section: Modelling Uncertainties and Future Research Needsmentioning

confidence: 99%

Modelling the diurnal and seasonal dynamics of soil CO<sub>2</sub> exchange in a semiarid ecosystem with high plant–interspace heterogeneity

et al. 2018

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Abstract. We used process-based modelling to investigate the roles of carbon-flux (C-flux) components and plantinterspace heterogeneities in regulating soil CO 2 exchanges (F S ) in a dryland ecosystem with sparse vegetation. To simulate the diurnal and seasonal dynamics of F S , the modelling considered simultaneously the CO 2 production, transport and surface exchanges (e.g. biocrust photosynthesis, respiration and photodegradation). The model was parameterized and validated with multivariate data measured during the years 2013-2014 in a semiarid shrubland ecosystem in Yanchi, northwestern China. The model simulation showed that soil rewetting could enhance CO 2 dissolution and delay the emission of CO 2 produced from rooting zone. In addition, an ineligible fraction of respired CO 2 might be removed from soil volumes under respiration chambers by lateral water flows and root uptakes. During rewetting, the lichen-crusted soil could shift temporally from net CO 2 source to sink due to the activated photosynthesis of biocrust but the restricted CO 2 emissions from subsoil. The presence of plant cover could decrease the root-zone CO 2 production and biocrust C sequestration but increase the temperature sensitivities of these fluxes. On the other hand, the sensitivities of root-zone emissions to water content were lower under canopy, which may be due to the advection of water flows from the interspace to canopy. To conclude, the complexity and plant-interspace heterogeneities of soil C processes should be carefully considered to extrapolate findings from chamber to ecosystem scales and to predict the ecosystem responses to climate change and extreme climatic events. Our model can serve as a useful tool to simulate the soil CO 2 efflux dynamics in dryland ecosystems.

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“…9.2e, h). A study on the impact of burial in the Hopq desert, China, found that if the thickness of burial by sand does not exceed a threshold of 1 cm, it can actually promote a structuring process by applying selective stress on the biocrust organisms that favors mobile genera (e.g., Microcoleus) (Rao et al 2012), which can move upward to the new surface, thereby creating new surface layers (Felde et al 2014). However, if the sand burial height exceeds this threshold, the biocrust is severely damaged (Rao et al 2012) and may not be able to recover.…”

Section: Mechanical Disturbancementioning

confidence: 99%