Small-scale spatial variation in soil CO2 efflux in a Mediterranean semiarid steppe

Maestre, Fernando T.; Cortina, Jordi

doi:10.1016/s0929-1393(03)00050-7

Cited by 156 publications

(115 citation statements)

References 35 publications

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“…Consistent with a study of Maestre and Cortina (2003), we found significant emissions from the semiarid soil under regimes of low moisture supply coupled with higher soil temperatures. In spite of different temperature amplitudes, the bulk of CO 2 effluxes were similar between the soil in SE Spain (ca.…”

Section: Bsc-related Co 2 Fluxes and Soil Effluxsupporting

confidence: 91%

The CO<sub>2</sub> exchange of biological soil crusts in a semiarid grass-shrubland at the northern transition zone of the Negev desert, Israel

et al. 2008

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Abstract. Biological soil crusts (BSC) contribute significantly to the soil surface cover in many dryland ecosystems. A mixed type of BSC, which consists of cyanobacteria, mosses and cyanolichens, constitutes more than 60% of ground cover in the semiarid grass-shrub steppe at Sayeret Shaked in the northern Negev Desert, Israel. This study aimed at parameterizing the carbon sink capacity of welldeveloped BSC in undisturbed steppe systems. Mobile enclosures on permanent soil borne collars were used to investigate BSC-related CO 2 fluxes in situ and with natural moisture supply during 10 two-day field campaigns within seven months from fall 2001 to summer 2002. Highest BSC-related CO 2 deposition between -11.31 and -17.56 mmol m −2 per 15 h was found with BSC activated from rain and dew during the peak of the winter rain season. Net CO 2 deposition by BSC was calculated to compensate 120%, -26%, and less than 3% of the concurrent soil CO

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Section: Bsc-related Co 2 Fluxes and Soil Effluxsupporting

confidence: 91%

The CO<sub>2</sub> exchange of biological soil crusts in a semiarid grass-shrubland at the northern transition zone of the Negev desert, Israel

et al. 2008

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“…Compared with temporal variation of soil respiration, which can be frequently well explained by environment factors such as soil temperature and soil moisture, the spatial variation of SR tends to be more complicated because of its high spatial variation, especially in semiarid and arid areas [8] [10]. As a result, there are always cases that no evident controlling factor could be detected with significant spatial variations, except that variables related to forest structure may have explained some of the variation of soil respiration [50].…”

Section: Spatial Variations Of Soil Respiration In Three Ecosystemsmentioning

confidence: 99%

“…The process of soil respiration is affected by various abiotic and biotic factors, which all undergo significant temporal and spatial changes and hence difficult to grasp [8]. Understanding on spatial variation of soil respiration is crucial to estimate representative soil respiration within an ecosystem [9], including those in arid areas, where the distribution of ecological factors and organisms is markedly patchy [10] [11].…”

Section: Introductionmentioning

confidence: 99%

“…As pointed out by [11], spatial variations of soil characteristics are largely controlled by the spatial organization of perennial plants in desert ecosystems, noted as "islands of fertility". In addition to the effects of the patchy distribution of vegetation, heterogeneity of soil properties, such as soil temperature, soil moisture, soil salinity/alkalinity and soil microbial organic carbon, may further complicate the spatial variation of soil respiration [8]. As such, the specific spatial patterns of soil respiration and its relationship with these soil properties in arid ecosystems are still poorly known.…”

Section: Introductionmentioning

confidence: 99%

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Spatial Variations of Soil Respiration in Arid Ecosystems

Liu¹,

Sonobe²,

Wang³

2016

OJE

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Soil respiration releases a major carbon flux back to atmosphere and thus plays an important role in global carbon cycling. Soil respiration is well known for its significant spatial variation in terrestrial ecosystems, especially in fragile ecosystems of arid land, where vegetation is distributed sparsely and the climate changes dramatically. In this study, soil respiration in three typical arid ecosystems: desert ecosystem (DE), desert-farmland transition ecosystem (TE) and farmland ecosystem (FE) in an arid area of northwestern China were studied for their spatial variations in 2012 and 2013. Along with soil respiration (SR), soil surface temperature (ST), soil moisture (SM) and soil electrical conductivity (ECb) were also recorded to investigate the spatial variations and the correlations among them. The results revealed that averaged soil respiration rate was much lower in DE than those in TE and FE. No single factor could adequately explain the variation of soil respiration, except a negative relationship between soil temperature and soil respiration in FE (P < 0.05). Geostatistical analysis showed that the spatial heterogeneity of soil respiration in DE was insignificant but notably in both TE and FE, especially in FE, which was mainly attributed to the different vegetation or soil moisture characteristics in the three ecosystems. The results obtained in this study will help to provide a better understanding on spatial variations of soil respiration and soil properties in arid ecosystems and also on macroscale carbon cycling evaluations.

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“…Temporal and spatial variability in R s , such as seasonal and diurnal changes in temperature, and heterogeneity between and within different sites, result in uncertainties in estimating the amount of soil carbon efflux and quantifying the relationship between R s and environmental factors (Kang et al 2003;Maestre & Cortina 2003;Khomik et al 2006). Studies on R s have been carried out in different ecosystems, ranging from tundra to equatorial regions (Raich & Schlesinger 1992).…”

Section: Introductionmentioning

confidence: 99%

Response of soil respiration to temperature and soil moisture: Effects of different vegetation types on a small scale in the eastern Loess Plateau of China

Yan

et al. 2013

Plant Biosystems - An International Journal Dealing with all As

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Soil respiration is affected by vegetation and environmental conditions. The purpose of this study was to investigate the effect of vegetation type on soil respiration, temperature and water content, and their correlations on a small scale. We measured soil respiration rate (R s ) over a 3-year period at biweekly intervals in three plots in the eastern Loess Plateau of China, with the same soil texture but different vegetation types: pine forest, grassland, and shrub land. Simultaneously, soil temperature (T s ) at 10 cm depth and soil water content (W s ) within 10 cm depth were measured. The seasonal course of R s and T s showed a similar temporal variation in the three plots, with higher values in summer and autumn and lower values in winter and spring. No significant differences (P . 0.05) were found between plots, except for W s . The mean cumulative release of CO 2 efflux from March to December was 962.5, 1027.5, and 1166.5 g C m 22 a 21 for plots 1, 2, and 3, respectively, with no significant difference between plots. The fitted exponential equations of R s versus T s from the 3-year data-set were significant (P , 0.05) with an R 2 of 0.72, 0.64, and 0.72 for plots 1, 2, and 3, respectively. The calculated Q 10 from the parameters of the fitted equation was 3.57, 3.52, and 3.61, and the R 10 was 2.36, 2.03, and 2.37 mmol CO 2 m 22 s 21 for plots 1, 2, and 3, respectively. Compared with the T s , the correlations between R s and W s were not significant for the three plots. However, if the T s was above 108C, then their correlation was significant, and W s had an impact on R s . Four combined regression equations including two variables of T s and W s could be well established to model correlations between R s and both T s and W s . Our study demonstrated that the exponential and power model fitted best and no significant different correlations of combined equations existed between the three plots. These results show that vegetation type had little impact on R s , T s , W s , and their correlations, as well as on related parameters such as Q 10 and R 10 . Therefore, while doing R s research in a horizontal patchy vegetation conditions on a small area, the sampling location of measurements should focus on vertical dominant vegetation and ignore patch vegetation so as to reduce field work load.

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Small-scale spatial variation in soil CO2 efflux in a Mediterranean semiarid steppe

Cited by 156 publications

References 35 publications

The CO<sub>2</sub> exchange of biological soil crusts in a semiarid grass-shrubland at the northern transition zone of the Negev desert, Israel

The CO<sub>2</sub> exchange of biological soil crusts in a semiarid grass-shrubland at the northern transition zone of the Negev desert, Israel

Spatial Variations of Soil Respiration in Arid Ecosystems

Response of soil respiration to temperature and soil moisture: Effects of different vegetation types on a small scale in the eastern Loess Plateau of China

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Small-scale spatial variation in soil CO2 efflux in a Mediterranean semiarid steppe

Cited by 156 publications

References 35 publications

The CO&lt;sub&gt;2&lt;/sub&gt; exchange of biological soil crusts in a semiarid grass-shrubland at the northern transition zone of the Negev desert, Israel

The CO&lt;sub&gt;2&lt;/sub&gt; exchange of biological soil crusts in a semiarid grass-shrubland at the northern transition zone of the Negev desert, Israel

Spatial Variations of Soil Respiration in Arid Ecosystems

Response of soil respiration to temperature and soil moisture: Effects of different vegetation types on a small scale in the eastern Loess Plateau of China

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The CO<sub>2</sub> exchange of biological soil crusts in a semiarid grass-shrubland at the northern transition zone of the Negev desert, Israel

The CO<sub>2</sub> exchange of biological soil crusts in a semiarid grass-shrubland at the northern transition zone of the Negev desert, Israel