A comparison of trenched plot techniques for partitioning soil respiration

Bond‐Lamberty, Ben; Bronson, Dustin R.; Bladyka, Emma; Gower, Stith T.

doi:10.1016/j.soilbio.2011.06.011

Cited by 77 publications

(40 citation statements)

References 62 publications

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“…However, the method may cause biases in estimated R h in a few sources. First, vegetation exclusion (especially aboveground plants) might result in higher soil surface temperature and lower soil moisture, and then increased or decreased R h depending on the change in soil moisture (Bond-Lamberty et al, 2011;Hanson et al, 2000). Thus, the effects of warming on the other components of R eco could be regulated by the changes in soil temperature and soil moisture.…”

Section: Partitioning Methods and Uncertaintiesmentioning

confidence: 99%

Differential responses of ecosystem respiration components to experimental warming in a meadow grassland on the Tibetan Plateau

Chen

Luo

Xia

et al. 2016

Agricultural and Forest Meteorology

133

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a b s t r a c tGlobal warming is anticipated to have profound effects on terrestrial carbon fluxes and thus feed backs to future climate change. Ecosystem respiration (R eco ) is one of the dominant components of biosphere CO 2 fluxes, but the effects of warming on R eco are still unclear. A field warming experiment using open top chambers (OTCs) was conducted in a meadow grassland on the Tibetan Plateau to study the effects of warming on the components of R eco . Warming significantly enhanced above-ground plant respiration (R agb ) and total autotrophic plant respiration (R plant ) by 28.7% and 19.9%, respectively, but reduced heterotrophic respiration (R h ) by 10.4%. These different responses resulted in the insensitive responses of R eco and soil respiration (R s ) to the experimental warming. The warming treatment also increased R plant /R eco and R agb /R eco by 8.4% and 17.3%, respectively, while decreasing R h /R eco by 19.0%, suggesting that warming could eventually cause R eco to be dominated by R plant . Enhancements in R plant and R agb were related to the warming-induced increases in aboveground biomass (AGB) while reduced R h was closely coupled with warming-induced decrease of microbial biomass carbon. Our results highlight that the differential responses of the components of R eco to different environmental physics under warming scenarios should be taken into consideration to project the future carbon-climate feed backs.

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Section: Partitioning Methods and Uncertaintiesmentioning

confidence: 99%

Differential responses of ecosystem respiration components to experimental warming in a meadow grassland on the Tibetan Plateau

Chen

Luo

Xia

et al. 2016

Agricultural and Forest Meteorology

133

View full text Add to dashboard Cite

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“…GPP = gross primary production; Ra = autotrophic respiration; Reco = ecosystem respiration; Rh = heterotrophic respiration; NPP = net primary productivity; NPPw AG = aboveground wood NPP; NPPl = leaf NPP; NPPf = fruit NPP; NPPu = understory NPP; NPPw BG = belowground wood NPP; NPPfr = fine roots NPP; OC fert = organic carbon content of fertilizer; NEP = net ecosystem productivity; Fruit Harvest = fruit production exported from the ecosystem. (Subke et al, 2006;Lambert et al, 2011). Among them, the most important is probably the fact that part of the measured C may come from decomposition of roots that are excised during the trenching process (Hanson at al., 2000).…”

Section: Magnitude Of C Fluxesmentioning

confidence: 99%

Net primary productivity, allocation pattern and carbon use efficiency in an apple orchard assessed by integrating eddy covariance, biometric and continuous soil chamber measurements

et al. 2013

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Carbon use efficiency (CUE), the ratio of net primary production (NPP) over gross primary production (GPP), is a functional parameter that could possibly link the current increasingly accurate global GPP estimates with those of net ecosystem exchange, for which global predictors are still unavailable. Nevertheless, CUE estimates are actually available for only a few ecosystem types, while information regarding agro-ecosystems is scarce, in spite of the simplified spatial structure of these ecosystems that facilitates studies on allocation patterns and temporal growth dynamics.

We combined three largely deployed methods, eddy covariance, soil respiration and biometric measurements, to assess monthly values of CUE, NPP and allocation patterns in different plant organs in an apple orchard during a complete year (2010). We applied a measurement protocol optimized for quantifying monthly values of carbon fluxes in this ecosystem type, which allows for a cross check between estimates obtained from different methods. We also attributed NPP components to standing biomass increments, detritus cycle feeding and lateral exports.

We found that in the apple orchard, both net ecosystem production and gross primary production on a yearly basis, 380 ± 30 g C m⁻² and 1263 ± 189 g C m⁻² respectively, were of a magnitude comparable to those of natural forests growing in similar climate conditions. The largest differences with respect to forests are in the allocation pattern and in the fate of produced biomass. The carbon sequestered from the atmosphere was largely allocated to production of fruit: 49% of annual NPP was taken away from the ecosystem through apple production. Organic material (leaves, fine root litter, pruned wood and early fruit falls) contributing to the detritus cycle was 46% of the NPP. Only 5% was attributable to standing biomass increment, while this NPP component is generally the largest in forests.

The CUE, with an annual average of 0.71 ± 0.12, was higher than the previously suggested constant values of 0.47–0.50. Low nitrogen investment in fruit, the limited root apparatus, and the optimal growth temperature and nutritional condition observed at the site are suggested to be explanatory variables for the high CUE observed

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“…In general, many northern peatlands are expected to be drier under future climates [10,11], and while the response of peatland ecosystem respiration to water-table drawdown has been extensively studied [12][13][14][15][16][17], controlled field experimentation for partitioning ecosystem respiration into its source-based major components remains largely unexplored [18]. Research is needed to investigate source-based respiration fluxes in relation to potential changes in environmental conditions to improve our understanding of changes in ecosystem C storage or emissions to the atmosphere under climate change scenarios [19,20].…”

Section: Introductionmentioning

confidence: 99%

Partitioning Forest‐Floor Respiration into Source Based Emissions in a Boreal Forested Bog: Responses to Experimental Drought

Munir

Khadka

et al. 2017

Forests

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Abstract:Northern peatlands store globally significant amounts of soil carbon that could be released to the atmosphere under drier conditions induced by climate change. We measured forest floor respiration (R FF ) at hummocks and hollows in a treed boreal bog in Alberta, Canada and partitioned the flux into aboveground forest floor autotrophic, belowground forest floor autotrophic, belowground tree respiration, and heterotrophic respiration using a series of clipping and trenching experiments. These fluxes were compared to those measured at sites within the same bog where water-table (WT) was drawn down for 2 and 12 years. Experimental WT drawdown significantly increased R FF with greater increases at hummocks than hollows. Greater R FF was largely driven by increased autotrophic respiration driven by increased growth of trees and shrubs in response to drier conditions; heterotrophic respiration accounted for a declining proportion of R FF with time since drainage. Heterotrophic respiration was increased at hollows, suggesting that soil carbon may be lost from these sites in response to climate change induced drying. Overall, although WT drawdown increased R FF , the substantial contribution of autotrophic respiration to R FF suggests that peat carbon stocks are unlikely to be rapidly destabilized by drying conditions.

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A comparison of trenched plot techniques for partitioning soil respiration

Cited by 77 publications

References 62 publications

Differential responses of ecosystem respiration components to experimental warming in a meadow grassland on the Tibetan Plateau

Differential responses of ecosystem respiration components to experimental warming in a meadow grassland on the Tibetan Plateau

Net primary productivity, allocation pattern and carbon use efficiency in an apple orchard assessed by integrating eddy covariance, biometric and continuous soil chamber measurements

Partitioning Forest‐Floor Respiration into Source Based Emissions in a Boreal Forested Bog: Responses to Experimental Drought

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