The use of soil respiration as an ecological indicator in arid ecosystems of the SE of Spain: Spatial variability and controlling factors

Oyonarte, Cecilio; Rey, Ana; Raimundo, João; Escribano, Paula

doi:10.1016/j.ecolind.2011.08.013

Cited by 57 publications

(40 citation statements)

References 46 publications

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“…This behavior of deep χ c is in contrast with that of shallow χ c , which on seasonal scales (Fig. 1) is better described in terms of commonly reported semiarid conditions where soil respiration is clearly restricted by drought (Barron-Gafford et al, 2011;Maranon-Jimenez et al, 2011;Oyonarte et al, 2012;Rey et al, 2011), showing an inverse correlation with T and correlation with SWC. Shallow χ c shows maxima in winter and minima in summer coinciding with the vegetation's active period (Rey et al, 2012a) and favored by higher soil water contents limiting soil gas diffusivity.…”

Section: Growing Period Dry Period Depthmentioning

confidence: 48%

Deep CO<sub>2</sub> soil inhalation / exhalation induced by synoptic pressure changes and atmospheric tides in a carbonated semiarid steppe

et al. 2013

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Abstract. Knowledge of all the mechanisms and processes involved in soil CO 2 emissions is essential to close the global carbon cycle. Apart from molecular diffusion, the main physical component of such CO 2 exchange is soil ventilation. Advective CO 2 transport, through soil or snow, has been correlated with the wind speed, friction velocity or pressure (p). Here we examine variations in subterranean CO 2 molar fractions (χ c ) over two years within a vertical profile (1.5 m) in a semiarid ecosystem, as influenced by short-timescale p changes.Analyses to determine the factors involved in the variations in subterranean χ c were differentiated between the growing period and the dry period. In both periods it was found that variations in deep χ c (0.5-1.5 m) were due predominantly to static p variations and not to wind or biological influences. Within a few hours, the deep χ c can vary by fourfold, showing a pattern with two cycles per day, due to p oscillations caused by atmospheric tides. By contrast, shallow χ c (0.15 m) generally has one cycle per day as influenced by biological factors like soil water content and temperature in both periods, while the wind was an important factor in shallow χ c variations only during the dry period. Evidence of emissions was registered in the atmospheric boundary layer by eddy covariance during synoptic pressure changes when subterranean CO 2 was released; days with rising barometric pressure -when air accumulated belowground, including soil-respired CO 2 -showed greater ecosystem uptake than days with falling pressure. Future assessments of the net ecosystem carbon balance should not rely exclusively on Fick's law to calculate soil CO 2 effluxes from profile data.

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Section: Growing Period Dry Period Depthmentioning

confidence: 48%

Deep CO<sub>2</sub> soil inhalation / exhalation induced by synoptic pressure changes and atmospheric tides in a carbonated semiarid steppe

et al. 2013

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“…On the other hand no relationship with temperature was found as in other studies (Prolingheuer et al, 2010). In irrigated crops grown in Mediterranean conditions in summer temperature is not a limiting factor for the heterotrophic populations (Oyonarte et al, 2012), not having probably an effect on Rs variability.…”

Section: Significance Of Abiotic Factorsmentioning

confidence: 78%

Assessment of soil respiration patterns in an irrigated corn field based on spectral information acquired by field spectroscopy

Cicuéndez

Rodríguez-Rastrero

Huesca

et al. 2015

Agriculture, Ecosystems & Environment

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“…On one hand, CO 2,0.05 m was generally higher at the natural site given its lower degradation level, which probably promotes higher root respiration and microbial activity supported by higher vegetation density and soil fertility (Table 1), especially during spring (Fig. 8), as also pointed out by Oyonarte et al (2012). On the other hand, CO 2,1.50 m values were acutely higher at the degraded site, by up to 1000 ppm compared to the natural site (Tables S1-Table 7.…”

Section: Discussionmentioning

confidence: 53%

“…However, not only does the amount of subsoil CO 2 matter but also how effective its transport is, since both determine the net CO 2 release from the vadose zone to the atmosphere. In this context, Oyonarte et al (2012) found, in the same study area (Cabo de Gata-Níjar Natural Park), that soils with degradation symptoms, such as lower SOC, depleted biological activity, coarser texture and worse structure, showed higher soil CO 2 effluxes over the dry season. Additionally, soil CO 2 effluxes measured during summer months correlated positively with the fraction of rock outcrops, suggesting that deteriorated soil physical conditions actually enhanced vertical transfer of CO 2 -rich air from the subsoil to the atmosphere (Oyonarte et al, 2012).…”

Section: Amoladerasmentioning

confidence: 99%

“…In this context, Oyonarte et al (2012) found, in the same study area (Cabo de Gata-Níjar Natural Park), that soils with degradation symptoms, such as lower SOC, depleted biological activity, coarser texture and worse structure, showed higher soil CO 2 effluxes over the dry season. Additionally, soil CO 2 effluxes measured during summer months correlated positively with the fraction of rock outcrops, suggesting that deteriorated soil physical conditions actually enhanced vertical transfer of CO 2 -rich air from the subsoil to the atmosphere (Oyonarte et al, 2012). In fact, correlation analysis between CO 2,1.50 m and net CO 2 exchange/atmospheric pressure (Table 7) showed a stronger relationship between these variables at the degraded site.…”

Section: Amoladerasmentioning

confidence: 99%

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Can land degradation drive differences in the C exchange of two similar semiarid ecosystems?

et al. 2018

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Abstract. Currently, drylands occupy more than one-third of the global terrestrial surface and are recognized as areas vulnerable to land degradation. The concept of land degradation stems from the loss of an ecosystem's biological productivity due to long-term loss of natural vegetation or depletion of soil nutrients. Drylands' key role in the global carbon (C) balance has been recently demonstrated, but the effects of land degradation on C sequestration by these ecosystems still need to be investigated. In the present study, we compared net C and water vapor fluxes, together with satellite, meteorological and vadose zone (CO 2 , water content and temperature) measurements, between two nearby (∼ 23 km) experimental sites representing "natural" (i.e., site of reference) and "degraded" grazed semiarid grasslands. We utilized data acquired over 6 years from two eddy covariance stations located in southeastern Spain with highly variable precipitation magnitude and distribution. Results show a striking difference in the annual C balances with an average net CO 2 exchange of 196 ± 40 (C release) and −23 ± 2 g C m −2 yr −1 (C fixation) for the degraded and natural sites, respectively. At the seasonal scale, differing patterns in net CO 2 fluxes were detected over both growing and dry seasons. As expected, during the growing seasons, greater net C uptake over longer periods was observed at the natural site. However, a much greater net C release, probably derived from subterranean ventilation, was measured at the degraded site during drought periods. After subtracting the nonbiological CO 2 flux from net CO 2 exchange, flux partitioning results point out that, during the 6 years of study, gross primary production, ecosystem respiration and water use efficiency were, on average, 9, 2 and 10 times higher, respectively, at the natural site versus the degraded site. We also tested differences in all monitored meteorological and soil variables and CO 2 at 1.50 m belowground was the variable showing the greatest intersite difference, with ∼ 1000 ppm higher at the degraded site. Thus, we believe that subterranean ventilation of this vadose zone CO 2 , previously observed at both sites, partly drives the differences in C dynamics between them, especially during the dry season. It may be due to enhanced subsoil-atmosphere interconnectivity at the degraded site.

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The use of soil respiration as an ecological indicator in arid ecosystems of the SE of Spain: Spatial variability and controlling factors

Cited by 57 publications

References 46 publications

Deep CO<sub>2</sub> soil inhalation / exhalation induced by synoptic pressure changes and atmospheric tides in a carbonated semiarid steppe

Deep CO<sub>2</sub> soil inhalation / exhalation induced by synoptic pressure changes and atmospheric tides in a carbonated semiarid steppe

Assessment of soil respiration patterns in an irrigated corn field based on spectral information acquired by field spectroscopy

Can land degradation drive differences in the C exchange of two similar semiarid ecosystems?

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The use of soil respiration as an ecological indicator in arid ecosystems of the SE of Spain: Spatial variability and controlling factors

Cited by 57 publications

References 46 publications

Deep CO&lt;sub&gt;2&lt;/sub&gt; soil inhalation / exhalation induced by synoptic pressure changes and atmospheric tides in a carbonated semiarid steppe

Deep CO&lt;sub&gt;2&lt;/sub&gt; soil inhalation / exhalation induced by synoptic pressure changes and atmospheric tides in a carbonated semiarid steppe

Assessment of soil respiration patterns in an irrigated corn field based on spectral information acquired by field spectroscopy

Can land degradation drive differences in the C exchange of two similar semiarid ecosystems?

Contact Info

Product

Resources

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Deep CO<sub>2</sub> soil inhalation / exhalation induced by synoptic pressure changes and atmospheric tides in a carbonated semiarid steppe

Deep CO<sub>2</sub> soil inhalation / exhalation induced by synoptic pressure changes and atmospheric tides in a carbonated semiarid steppe