Physical and biogeochemical controls on soil respiration along a topographical gradient in a semiarid forest

Shi, Weiyu; Du, Sheng; Morina, Joseph C.; Guan, Jiunian; Wang, Kaibo; Ma, Mingguo; Yamanaka, Norikazu; Tateno, Ryunosuke

doi:10.1016/j.agrformet.2017.07.006

Cited by 24 publications

(17 citation statements)

References 59 publications

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“…Nevertheless, the correlation between soil respiration and soil microbe and enzyme activity, as well as plant growth under the aeration and irrigation treatments has not yet been well studied. In our study, regression analysis (linear, polynomial, and exponential) between soil respiration and WFPS was conducted, and a significant polynomial function was observed (Figure 7a,b, p < 0.05), similar to previous studies [11,12]. Further analysis found that a polynomial correlation was detected between soil respiration and WFPS when WFPS was below 60% (p < 0.01), while a linear positive correlation was observed when WFPS was above 60% (Figure 7c,d, p = 0.245 and 0.001 for the aeration and control, respectively).…”

Section: Soil Respirationsupporting

confidence: 86%

“…A few studies have reported an increase of soil respiration under AI [6,9,10], while the cause of CO 2 release needs to be further explored. Previously, studies on drivers of soil respiration have been largely conducted on soil water content, temperature, and the interaction of these two parameters [9,[11][12][13][14]. For AI treatment, a close correlation between soil CO 2 fluxes with soil water content and temperature has been confirmed [9,10].…”

Section: Introductionmentioning

confidence: 96%

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Irrigation Combined with Aeration Promoted Soil Respiration through Increasing Soil Microbes, Enzymes, and Crop Growth in Tomato Fields

et al. 2019

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Soil respiration (Rs) is one of the major components controlling the carbon budget of terrestrial ecosystems. Aerated irrigation has been proven to increase Rs compared with the control, but the mechanisms of CO2 release remain poorly understood. The objective of this study was (1) to test the effects of irrigation, aeration, and their interaction on Rs, soil physical and biotic properties (soil water-filled pore space, temperature, bacteria, fungi, actinomycetes, microbial biomass carbon, cellulose activity, dehydrogenase activity, root morphology, and dry biomass of tomato), and (2) to assess how soil physical and biotic variables control Rs. Therefore, three irrigation levels were included (60%, 80%, and 100% of full irrigation). Each irrigation level contained aeration and control. A total of six treatments were included. The results showed that aeration significantly increased total root length, dry biomass of leaf, stem, and fruit compared with the control (p < 0.05). The positive effect of irrigation on dry biomass of leaf, fruit, and root was significant (p < 0.05). With respect to the control, greater Rs under aeration (averaging 6.2% increase) was mainly driven by soil water-filled pore space, soil bacteria, and soil fungi. The results of this study are helpful for understanding the mechanisms of soil CO2 release under aerated subsurface drip irrigation.

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Section: Soil Respirationsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 96%

Irrigation Combined with Aeration Promoted Soil Respiration through Increasing Soil Microbes, Enzymes, and Crop Growth in Tomato Fields

et al. 2019

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“…Moreover, the changes in soil organic carbon stocks have been evaluated by adopting the recommended soil and water conservation practices in the upper Tana River catchment [4]. Other scholars have presented the results of research on several topics related to forest structure, soil moisture [5], soil physical and chemical properties [6], soil erosion, and soil and water conservation. Zhang et al proposed that vegetation reconstruction was an effective way to reduce runoff and soil erosion and should be the focus of restoring ecosystems in ecologically sensitive regions in loess areas [7].…”

Section: Introductionmentioning

confidence: 99%

Multifactor relationships between stand structure and soil and water conservation functions of Robinia pseudoacacia L. in the Loess Region

Wei

Liang

2019

PLoS ONE

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Ninety-six sample plots were established for a tree census to explore the multifactor relationships between the soil and water conservation functions and the stand structure in a typical black locust ( Robinia pseudoacacia L.) plantation in the Caijiachuan watershed of the Loess Plateau, Western Shanxi Province, China. Based on the observational and experimental data, a topography-structure-function model was built using a structural equation modeling (SEM) approach. The latent variables were the topographical factors, horizontal structure, vertical structure, soil and water conservation, and sediment reduction. The results indicated that the horizontal structure of the Robinia pseudoacacia L. forest was the most obvious latent variable, which was expressed in the path coefficient (pc = 0.85) corresponding to the sediment reduction; the stand density and tree competition index were the major drivers of the structure, with path coefficients of −0.96 and −0.92 and influence coefficients of −0.997 and −0.998. These factors are easily regulated. Among these factors the stand density of the arbor layer is recommended to be kept stable within the range from 1600 to 1700 trees/hm 2 . These relationships showed that reducing the tree competition index and changing the microtopography could effectively enhance the soil and water conservation functions in this ecologically significant loess area.

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“…Fine soil particles may be transported because of downward runoff which results in their deposition at the gully bottom and the clay soil particles may absorb soil organic carbon (SOC) [17]. Studies on forest soils have shown a higher SOC stock in the bottom positions [17,18] or in the mid-slope [19] compared to the upper levels, although the differences in various components are not always significant [20]. An important factor regulating the activity of soil microorganisms is also the presence of vegetation, which through a demand for nitrogen or water decreases these constituents in the soil [16].…”

Section: Introductionmentioning

confidence: 99%

Variations in Soil Properties and CO2 Emissions of a Temperate Forest Gully Soil along a Topographical Gradient

Walkiewicz

Bulak

Brzezińska

et al. 2021

Forests

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Although forest soils play an important role in the carbon cycle, the influence of topography has received little attention. Since the topographical gradient may affect CO2 emissions and C sequestration, the aims of the study were: (1) to identify the basic physicochemical and microbial parameters of the top, mid-slope, and bottom of a forest gully; (2) to carry out a quantitative assessment of CO2 emission from these soils incubated at different moisture conditions (9% and 12% v/v) and controlled temperature (25 °C); and (3) to evaluate the interdependence between the examined parameters. We analyzed the physicochemical (content of total N, organic C, pH, clay, silt, and sand) and microbial (enzymatic activity, basal respiration, and soil microbial biomass) parameters of the gully upper, mid-slope, and bottom soil. The Fourier Transformed Infrared spectroscopy (FTIR) method was used to measure CO2 emitted from soils. The position in the forest gully had a significant effect on all soil variables with the gully bottom having the highest pH, C, N concentration, microbial biomass, catalase activity, and CO2 emissions. The sand content decreased as follows: top > bottom > mid-slope and the upper area had significantly lower clay content. Dehydrogenase activity was the lowest in the mid-slope, probably due to the lower pH values. All samples showed higher CO2 emissions at higher moisture conditions, and this decreased as follows: bottom > top > mid-slope. There was a positive correlation between soil CO2 emissions and soil microbial biomass, pH, C, and N concentration, and a positive relationship with catalase activity, suggesting that the activity of aerobic microorganisms was the main driver of soil respiration. Whilst the general applicability of these results to other gully systems is uncertain, the identification of the slope-related movement of water and inorganic/organic materials as a significant driver of location-dependent differences in soil respiration, may result in some commonality in the changes observed across different gully systems.

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Physical and biogeochemical controls on soil respiration along a topographical gradient in a semiarid forest

Cited by 24 publications

References 59 publications

Irrigation Combined with Aeration Promoted Soil Respiration through Increasing Soil Microbes, Enzymes, and Crop Growth in Tomato Fields

Irrigation Combined with Aeration Promoted Soil Respiration through Increasing Soil Microbes, Enzymes, and Crop Growth in Tomato Fields

Multifactor relationships between stand structure and soil and water conservation functions of Robinia pseudoacacia L. in the Loess Region

Variations in Soil Properties and CO2 Emissions of a Temperate Forest Gully Soil along a Topographical Gradient

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