13 research outputs found

    Relationships between average monthly soil respiration and environmental factors among sites.

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    <p>Shoot biomass (A), root biomass (B), litter biomass (C), SOC (D), total C (E), and total N (F) of three adjacent vegetation types (<i>Phragmites australis</i>, <i>Suaeda salsa</i> and bare soil sites). Bars represent standard errors of the means. One point represents the average soil respiration and average environmental factors of each patch during one month of measurement. Closed circles (•) represent <i>Phragmites australis</i> community, open circles (○) represent <i>Suaeda salsa</i> community, and closed triangles (▴) represent bare soil site.</p

    Values of coefficients <i>a</i> and <i>b</i> of the Eq. (), the temperature sensitivity of soil respiration (<i>Q</i><sub>10</sub>) and their one-way ANOVA test among different vegetation patches during the growing season in a estuary wetland.

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    <p><i>a</i>, <i>b</i> are coefficients of the Eq. (), <i>Q</i><sub>10</sub> is the temperature sensitivity of soil respiration (), <i>r</i><sup>2</sup> is the determinant coefficient. n is the number of samples data. Numbers in brackets represent the standard error of the mean. A one-way ANOVA was used to compare <i>a</i>, <i>b</i>, and <i>Q</i><sub>10</sub> values among different vegetation patches (n = 3). Different letters indicate significant difference (<i>P</i><0.05) among different vegetation patches.</p

    Temporal patterns of soil respiration and environmental factors among sites.

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    <p>(A), daily means of net radiation and soil temperature (Tsoil) at 10 cm depth; (B), daily means of soil water content (SWC) at 10 cm and 20 cm depth and precipitation; (C), averaged shoot and root biomass of <i>Phragmites australis</i> and <i>Suaeda salsa</i>; (D), daily means of soil respiration (SR). Error bars represent ± SE.</p

    Spatial distribution patterns of wetland vegetation at different spatial scales in the Yellow River Estuary.

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    <p>(A), At the landscape and regional scale (from several kilometers to tens of kilometers), various vegetation types develop and wriggle upwards along with the river pathway from the sea to the land (Modified from Fang <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0091182#pone.0091182-Fang1" target="_blank">[33]</a>); (B), At the field scale (from several meters to tens of meters), the spatial distribution patterns of vegetation are mostly identified as patches of <i>Phragmites australis</i>, <i>Suaeda salsa</i> or bare soil in many sites.</p

    Data_Sheet_1_Moderate increase of precipitation stimulates CO2 production by regulating soil organic carbon in a saltmarsh.docx

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    Saltmarsh is widely recognized as a blue carbon ecosystem with great carbon storage potential. Yet soil respiration with a major contributor of atmospheric CO2 can offset its carbon sink function. Up to date, mechanisms ruling CO2 emissions from saltmarsh soil remain unclear. In particular, the effect of precipitation on soil CO2 emissions is unclear in coastal wetlands, due the lack of outdoor data in real situations. We conducted a 7-year field manipulation experiment in a saltmarsh in the Yellow River Delta, China. Soil respiration in five treatments (−60%, −40%, +0%, +40%, and + 60% of precipitation) was measured in the field. Topsoils from the last 3 years (2019–2021) were analyzed for CO2 production potential by microcosm experiments. Furthermore, quality and quantity of soil organic carbon and microbial function were tested. Results show that only the moderate precipitation rise of +40% induced a 66.2% increase of CO2 production potential for the microcosm experiments, whereas other data showed a weak impact. Consistently, soil respiration was also found to be strongest at +40%. The CO2 production potential is positively correlated with soil organic carbon, including carbon quantity and quality. But microbial diversity did not show any positive response to precipitation sizes. r-/K-strategy seemed to be a plausible explanation for biological factors. Overall, our finding reveal that a moderate precipitation increase, not decrease or a robust increase, in a saltmarsh is likely to improve soil organic carbon quality and quantity, and bacterial oligotroph:copiotroph ratio, ultimately leading to an enhanced CO2 production.</p
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