Differential soil respiration responses to changing hydrologic regimes

Pacific, V. J.; McGlynn, B. L.; Riveros-Iregui, D. A.; Epstein, Howard E.; Welsch, D. L.

doi:10.1029/2009wr007721

Cited by 45 publications

(31 citation statements)

References 43 publications

(47 reference statements)

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“…Soil pH ranged from 4.22 to 5.64 in HUZ sites, from 5.63 to 6.86 in LUZ sites, and from 5.41 to 6.30 in RZ sites. Soil CO 2 and CH 4 concentrations and surface CO 2 efflux were consistently higher in RZ sites than in LUZ and HUZ sites (see Table S1), in agreement with previous reports on CO 2 from this site (23,24,26,31).…”

Section: Soil Environmental Measurementssupporting

confidence: 81%

“…Surprisingly, there is little information regarding the soil microbial communities involved. This experimental forest has been studied extensively in efforts to quantify soil CO 2 production and surface efflux as a function of hydrology at the landscape scale (23,24,26,31,32,49,50). The current study aimed to continue these landscape-scale efforts by assessing potential linkages between different soil environments within this watershed and the microbial drivers of greenhouse gas exchanges.…”

Section: Discussionmentioning

confidence: 99%

“…1) within the Lewis and Clark National Forest, Montana, have focused on the spatial and tem-poral scaling of hydrological, biogeochemical, and ecological processes across the larger Tenderfoot Creek Watershed, with particular focus on the Stringer Creek drainage. These studies have included watershed hydrology (e.g., stream water sources, flow paths, and riparian dynamics) (21,22), relationships between hydrologic conditions and CO 2 efflux across landscape positions (23,24), and landscape-scale land-atmosphere CO 2 , H 2 O, and energy fluxes (25,26). This site is characteristic of vast extents of forests in the northern Rocky Mountains and continues to be the focus of studies aimed at generating models that accurately describe and explain the biotic and abiotic processes that contribute to subalpine ecosystem function.…”

mentioning

confidence: 99%

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Landscape Position Influences Microbial Composition and Function via Redistribution of Soil Water across a Watershed

Riveros-Iregui

Jones

et al. 2015

Appl Environ Microbiol

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g Subalpine forest ecosystems influence global carbon cycling. However, little is known about the compositions of their soil microbial communities and how these may vary with soil environmental conditions. The goal of this study was to characterize the soil microbial communities in a subalpine forest watershed in central Montana (Stringer Creek Watershed within the Tenderfoot Creek Experimental Forest) and to investigate their relationships with environmental conditions and soil carbonaceous gases. As assessed by tagged Illumina sequencing of the 16S rRNA gene, community composition and structure differed significantly among three landscape positions: high upland zones (HUZ), low upland zones (LUZ), and riparian zones (RZ). Soil depth effects on phylogenetic diversity and ␤-diversity varied across landscape positions, being more evident in RZ than in HUZ. Mantel tests revealed significant correlations between microbial community assembly patterns and the soil environmental factors tested (water content, temperature, oxygen, and pH) and soil carbonaceous gases (carbon dioxide concentration and efflux and methane concentration). With one exception, methanogens were detected only in RZ soils. In contrast, methanotrophs were detected in all three landscape positions. Type I methanotrophs dominated RZ soils, while type II methanotrophs dominated LUZ and HUZ soils. The relative abundances of methanotroph populations correlated positively with soil water content (R ‫؍‬ 0.72, P < 0.001) and negatively with soil oxygen (R ‫؍‬ ؊0.53, P ‫؍‬ 0.008). Our results suggest the coherence of soil microbial communities within and differences in communities between landscape positions in a subalpine forested watershed that reflect historical and contemporary environmental conditions. I n the western United States, approximately 70% of carbon sink activity is located at elevations above 750 m, where 50 to 85% of land is dominated by hilly or mountainous topography (1). Fluxes of carbonaceous gases, such as carbon dioxide (CO 2 ) and methane (CH 4 ), significantly affect the size of the carbon sink, with soil respiration accounting for the largest terrestrial CO 2 flux to the atmosphere (2). CO 2 in soil pore spaces is derived primarily from autotrophic (root) and heterotrophic (microbe) respiration, which is mediated by environmental factors such as temperature, soil water content (SWC), O 2 availability, and organic matter (3-5). The direction and intensity of CH 4 flux depends on the local balance of the CH 4 consumption by methanotrophs and CH 4 production by methanogens, both of which also are subject to such environmental influences. Because diffusive gas transport through soils is reduced with increasing SWC, hydrologic variations can strongly affect soil O 2 levels, which in turn influence the relative rates of (anaerobic) methanogenesis and (aerobic) methanotrophy. Although saturated soils (e.g., wetlands) are major terrestrial sources of CH 4 emissions (6), emission may at times occur from unsaturated soils, depending on th...

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Section: Soil Environmental Measurementssupporting

confidence: 81%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Landscape Position Influences Microbial Composition and Function via Redistribution of Soil Water across a Watershed

Riveros-Iregui

Jones

et al. 2015

Appl Environ Microbiol

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“…Soil CO 2 efflux is most commonly modelled as a function of temperature and moisture (Kang et al 2003(Kang et al , 2006Tang and Baldocchi 2005;Sjögersten et al 2006;Pacific et al 2009). In this study, we found agreement that temperature and moisture were important drivers of CO 2 efflux.…”

Section: Discussionsupporting

confidence: 73%

“…The majority of models developed to predict forest soil CO 2 efflux are fairly simple, accounting for temperature and soil moisture based on their abilities to control the rates of biological reactions in soil microbes (e.g., Kang et al 2003Kang et al , 2006Tang and Baldocchi 2005;Sjögersten et al 2006;Pacific et al 2009;Barron-Gafford et al 2011;Cable et al 2012;Chang et al 2014). Temperature is usually the strongest predictor of soil CO 2 efflux, because temperature directly controls microbial activity and rates of respiration (Davidson et al 1998.…”

Section: Introductionmentioning

confidence: 99%

Forest soil CO2 efflux models improved by incorporating topographic controls on carbon content and sorption capacity of soils

Lecki

Creed

2016

Biogeochemistry

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Improved models are needed to predict the fate of carbon in forest soils under changing environmental conditions. Within a temperate sugar maple forest, soil CO 2 efflux averaged 3.58 lmol m -2 s -1 but ranged from 0.02 to 25.35 lmol m -2 s -1 . Soil CO 2 efflux models based on temperature and moisture explained approximately the same amount of variance on gentle and steep hillslopes (r 2 = 0.506, p \ 0.05 and r 2 = 0.470, p \ 0.05 respectively). When soil carbon content and sorption capacity were added to the models, the amount of explanation increased slightly on a gentle hillslope (r 2 = 0.567, p \ 0.05) and substantially on a steep hillslope (r 2 = 0.803, p \ 0.05). Within the organic-rich surface of the mineral soil, carbon content was positively related and sorption capacity was negatively related to soil CO 2 efflux rates. There were general patterns of smaller carbon pools and lower sorption capacity in the upland positions than in the lowland and wetland positions, likely a result of hydrological transport of particulate and dissolved substances downslope, leading to higher soil CO 2 efflux in the upland positions. However, the magnitude of the soil CO 2 efflux was mitigated by the higher sorption capacity of the organic-rich surface layer of the mineral soils, which was negatively correlated to soil CO 2 efflux. More accurate estimates of forest soil CO 2 efflux must take into account topographic influences on the carbon pool, the environmental factors that affect rates of carbon transformation, as well as the physicochemical factors that determine the fraction of the carbon pool that can be transformed.

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Effect of throughfall variability on recharge: application to hemlock and deciduous forests in western Massachusetts

Guswa

Spence

2011

Ecohydrology

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Vegetation canopies intercept and redistribute precipitation in space. Although throughfall patterns are challenging to correlate with plant characteristics, many studies have shown that the spatial patterns persist through time. This persistence leads to wet and dry spots that can affect recharge, transpiration, and other nonlinear ecohydrologic and biogeochemical processes. A stochastic framework is used to determine the effect of throughfall variability on hydrologic fluxes. Throughfall variability increases and concentrates recharge, and the magnitude of the effect depends on the character of throughfall variability along with characteristics of climate, soil, and vegetation. This framework is also used to explore specific differences in summertime recharge between stands of deciduous trees (birch, maple, and oak) and eastern hemlock (Tsuga canadensis). Throughout the eastern United States, the invasive hemlock woolly adelgid poses a significant threat to hemlock forests, and replacement of hemlock forests by other species has the potential to alter hydrologic fluxes and other processes. Field investigations in 2009 and 2010 indicate that, relative to deciduous stands, hemlock canopies intercept more water and tend to produce dry rather than wet spots. Although deciduous stands produce more throughfall, model results indicate that differences in canopy interception are outweighed by large differences in peak transpiration rates, and predictions of summertime recharge are lower in deciduous forests than in hemlock. Copyright © 2011 John Wiley & Sons, Ltd.

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Differential soil respiration responses to changing hydrologic regimes

Cited by 45 publications

References 43 publications

Landscape Position Influences Microbial Composition and Function via Redistribution of Soil Water across a Watershed

Landscape Position Influences Microbial Composition and Function via Redistribution of Soil Water across a Watershed

Forest soil CO2 efflux models improved by incorporating topographic controls on carbon content and sorption capacity of soils

Effect of throughfall variability on recharge: application to hemlock and deciduous forests in western Massachusetts

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