Landscape analysis of soil methane flux across complex terrain

Kaiser, Kendra E.; McGlynn, B. L.; Dore, John E.

doi:10.5194/bg-2017-518

Cited by 5 publications

(15 citation statements)

References 110 publications

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“…Significant net CH 4 emissions, mostly found in the valley bottom and the groundwater discharge zone (Figure 7 and Table S1), were positively correlated with soil water content, suggesting that anaerobic condition supports CH 4 production by methanogens at a rate exceeding the CH 4 oxidation capacity of the surface soils (Conrad, 1996;Le Mer & Roger, 2001). This suggests a dominant role of lower landscape positions in the catchment for net CH 4 production, similar to what has been found for wetlands and riparian zones (Jungkunst et al, 2008;Kaiser et al, 2018;MacDonald et al, 1998). The much higher CH 4 emission in the groundwater discharge zone than in the valley bottom (Figures 2a, 3, and 4) could be attributed to differences in anaerobic soil volume controlled by soil WFPS (Figure 1) and groundwater table (Figures 2d and S5).…”

Section: Journal Of Geophysical Research: Biogeosciencessupporting

confidence: 75%

“…At TSP forest, soils in the groundwater discharge zone emit on average 7,000 μg CH 4 -C·m −2 ·hr −1 (Figure 3), which is within the range of global averages for wetland CH 4 emissions (Turetsky et al, 2014). However, this CH 4 emission is higher than the values reported for riparian soils in temperate (Itoh et al, 2009;Kaiser et al, 2018;Warner et al, 2018) and tropical forests (O'Connell et al, 2018). This may be related to the high groundwater tables during monsoonal summer at our site (Figure 2d).…”

Section: Journal Of Geophysical Research: Biogeosciencessupporting

confidence: 60%

“…The spatial variability of CH 4 emissions in forests has been found to be highly dependent on topographic position, which governs soil moisture content and nutrient availability (Creed et al, 2013;Kaiser et al, 2018;Warner et al, 2018;Zhu et al, 2013). Our observations over a 3-year period show that well-drained Table 1).…”

Section: Discussionmentioning

confidence: 61%

“…Several studies have reported topographically regulated patterns of CH 4 fluxes in forest soils (Itoh et al, 2009;Kaiser et al, 2018;Pitz et al, 2018;Sakabe et al, 2016;Warner et al, 2018), mainly driven by topographically related differences in hydrological conditions (Kaiser et al, 2018). For instance, net uptake of CH 4 is often found on hillslopes, which is the dominant landscape element in forests and generally characterized by well-drained soils (Kaiser et al, 2018;Warner et al, 2018). In valley bottoms of forests, which are often water-saturated (e.g., groundwater discharge zone or riparian zone), significant net emissions have been reported (Itoh et al, 2009;O'Connell et al, 2018;Sakabe et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Humid Subtropical Forests Constitute a Net Methane Source: A Catchment‐Scale Study

Zhu

Zhang

et al. 2019

JGR Biogeosciences

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Commonly, well‐drained forest soils are net methane (CH4) sinks, whereas poorly drained soils in groundwater discharge zones could contribute significant CH4 emissions. Climate change is projected to bring more summer precipitation extremes to subtropics, which may affect forest CH4 balance. Chinese forests often have a hilly topography with well‐drained hillslopes and pronounced groundwater discharge zones. Although different landscape elements are likely to have different source and sink functions for CH4, the climatic influence on CH4 budget at the catchment scale remains poorly studied. Here, we measured CH4 fluxes over three years along a topographic gradient in a subtropical forested catchment in SW China. CH4 fluxes exhibited a clear spatial pattern indicating moderate CH4 uptake or emission from the well‐drained soils on the hillslope (−5.8 to +1.0 kg CH4‐C·ha−1·year−1) and significant CH4 emission from the wetter soils in the groundwater discharge zone (94.3 to 479.5 kg CH4‐C·ha−1·year−1). Despite its small area contribution to the catchment (0.6%), the groundwater discharge zone emitted substantial amounts of CH4 in monsoonal summers, affecting the whole‐catchment budget. Hillslope soils showed weaker CH4 uptake or even turned into a small CH4 source under wet climatic conditions. Estimates of catchment‐scale CH4 budgets indicate that subtropical forest catchments can tip from a net CH4 sink in drier years to a net CH4 source in wetter years, highlighting the importance of interannual climate variabilities. Our findings suggest that subtropical forests under projected climate change could contribute a net CH4 source with consequences for the regional CH4 balance.

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Section: Journal Of Geophysical Research: Biogeosciencessupporting

confidence: 75%

Section: Journal Of Geophysical Research: Biogeosciencessupporting

confidence: 60%

Section: Discussionmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

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Humid Subtropical Forests Constitute a Net Methane Source: A Catchment‐Scale Study

Zhu

Zhang

et al. 2019

JGR Biogeosciences

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“…When there is a lack of prior knowledge in the relevant fields of sample data, the radial basis kernel function is generally selected as the kernel function, which can better balance the fitting effect and generalization ability than other kernel functions [11,12]. e expression of the radial basis kernel function is as follows:…”

Section: Treatmentmentioning

confidence: 99%

Treatment Technology of Microbial Landscape Aquatic Plants for Water Pollution

Hu¹,

2021

Advances in Materials Science and Engineering

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With the rapid development of industrial and agricultural production, the rapid growth of population, and the acceleration of urbanization, the problem of water pollution is becoming more and more serious. Water shortages and pollution disrupt the balance of ecosystems and seriously limit people’s health and rapid economic development. Nowadays, the method of repairing sewage bodies using microbial landscape aquatic plants is attracting more and more attention, and it is a big challenge to maintain the sustainable development of human beings and nature. This paper uses floating rafts to combine microorganisms and landscape aquatic plants to conduct sewage treatment experiments. According to microorganisms, landscape aquatic plants absorb nutrients in the water body, examine the changes in water quality during the restoration of microorganisms’ landscape aquatic plants, and establish the growth of microorganisms’ landscape aquatic plants. The relationship with changes in water quality aims to provide a theoretical basis for the treatment of slow-flowing water bodies such as lakes, reservoirs, large artificial ponds, and rivers. In this paper, the experiments are divided into four groups (A (experimental sewage + microbial inoculant), B (experimental sewage + plant), C (experimental sewage + microbial inoculant + plant), and D (experimental sewage)). It can be divided into the total nitrogen content, total phosphorus content, and COD value data, and chromaticity detection of each group of the test is continuously monitored weekly to comprehensively detect and observe the repair effect on contaminated water bodies. The experiment proved that the water quality of the three treatment groups was significantly clearer than that of the blank control group, and its clarity: microorganism + plant > microorganism > plant > blank control group. This shows that the combination of microorganisms and landscape aquatic plants can effectively reduce the various pollutants contained in sewage and reduce the color of sewage. Treating sewage using plant technology that combines microorganisms is feasible and promising.

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Topography-related controls on N2O emission and CH4 uptake in a tropical rainforest catchment

Zhu

Bai

et al. 2021

Science of The Total Environment

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Landscape analysis of soil methane flux across complex terrain

Cited by 5 publications

References 110 publications

Humid Subtropical Forests Constitute a Net Methane Source: A Catchment‐Scale Study

Humid Subtropical Forests Constitute a Net Methane Source: A Catchment‐Scale Study

Treatment Technology of Microbial Landscape Aquatic Plants for Water Pollution

Topography-related controls on N2O emission and CH4 uptake in a tropical rainforest catchment

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