Prominent role of sulfate reduction in robust sulfur retention in subtropical soil

Yu, Qian; Mulder, Jan; Gaoyue, Si; Yu, Longfei; Kang, Ronghua; Liu, Kaiyi; Hao, Jiming; Duan, Lei

doi:10.21203/rs.3.rs-311235/v1

Cited by 2 publications

(3 citation statements)

References 31 publications

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“…The deposited S and N undergo transformations and retention in the soil, thus providing a significant buffering mechanism against soil and surface water acidification in subtropical China. Specifically, adsorption and reduction of soil SO 4 2as well as N immobilization in soil organic matter and denitrification of NO 3 in deeper soil layers and in wet soils of groundwater discharge zones in nearstream environments are primary mechanisms of S and N transformation and retention in subtropical China (Huang et al, 2015;Yu et al, 2016;Yu et al, 2023). Fe-and Aloxides, prominently present in well-drained, subtropical forests soils of southern China, are important sorbents for SO 4…”

Section: H I G H L I G H T S G R a P H I C Abstractmentioning

confidence: 99%

“…Besides SO 4 2sorption, also reduction of SO 4 2to sulfides (e.g., FeS, FeS 2 ) may provide a stable S sink. In the Tieshanping catchment SO 4 2reduction was the found to be the main soil S sink, especially in wet soils of the groundwater discharge zone at the foot of well drained hill slopes (Yu et al, 2023). Sinks of S and N in subtropical southern China played a significant role and amounted to 77% and 92% of the atmospheric inputs, respectively (Yu et al, 2021).…”

Section: H I G H L I G H T S G R a P H I C Abstractmentioning

confidence: 99%

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Effects of acid deposition control in China: a review based on responses of subtropical forests

Xie,

Ge,

Duan

et al. 2024

Front. Environ. Sci. Eng.

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For many decades, acid deposition used to pose a significant regional air pollution challenge in China. After substantial emission control of anthropogenically derived sulfur and nitrogen containing gasses, both sulfur and nitrogen deposition, as well as the acid rain-affected area, have significantly decreased compared to their peak levels. Forests, particularly in the humid subtropics, are sensitive to acid deposition, as evidenced by soil acidification, sulfate and nitrate leaching in stream water, and elevated soil nitrous oxide emission. Reduction in the total deposition of sulfur and nitrogen, caused a significant decline in sulfate and nitrate leaching from subtropical forest and subsequently in sulfate and nitrate concentrations in stream water, although there was about a 5-year delay. This delay may be attributed to the desorption of accumulated sulfate and continued elevated mineralization of accumulated nitrogen pools. Emissions of nitrous oxide, a potent greenhouse gas, also declined in nitrogen-saturated subtropical forest soils, as soil water nitrate concentration decreased. Therefore, subtropical forests in China suffering from elevated acid deposition have begun to recover. Yet, the current levels of sulfur and nitrogen deposition continue to exceed the critical loads, i.e., the assigned threshold levels in accordance with emission control policies, in more than 10% of the country’s land area, respectively, indicating remaining risks of acidification and eutrophication. Thus, further emission reductions are urgently needed, also because they will help achieving goals related to air quality and nitrous oxide emissions.

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Section: H I G H L I G H T S G R a P H I C Abstractmentioning

confidence: 99%

Section: H I G H L I G H T S G R a P H I C Abstractmentioning

confidence: 99%

Effects of acid deposition control in China: a review based on responses of subtropical forests

Xie,

Ge,

Duan

et al. 2024

Front. Environ. Sci. Eng.

View full text Add to dashboard Cite

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“…All data needed to evaluate the conclusions in the paper are present in the Figshare Digital Repository (https:// doi.org/10.6084/m9.figshare.24187749.v1) (Yu & Duan, 2023).…”

Section: Conflict Of Interestmentioning

confidence: 99%

Prominent Role of Sulfate Reduction in Considerable Sulfur Retention in a Subtropical Soil

Yu,

Mulder,

et al. 2023

JGR Biogeosciences

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The sulfur biogeochemical cycle controls the sulfur dynamics in the soil. In contrast to almost all deposited sulfur leaching out in temperate catchments, approximately 80% of the deposited S is retained in the catchments in subtropical regions. However, the mechanisms for sulfur retention were unclear, hindering the understanding of potential threats of legacy sulfur with environmental changes. Here, we demonstrated that sulfate reduction (as sulfide fixed in soil) was a prominent yet overlooked mechanism for sulfur retention in addition to the widely recognized sulfate adsorption in soil, based on a study on soil sulfur storage and stable isotope signatures within entire soil profiles in a typical subtropical catchment in China. Using a dual‐isotopic model, the sulfate reduction flux was further determined to be 30% of the S deposition. Due to a lot of deposited sulfur fixed via sulfate reduction, the release of soil legacy sulfur would be less in response to decreasing sulfur deposition compared to the projections only considering adsorption. However, the remobilization of large amounts of reduced S should be regarded as a threat to the environment under climate change in the future.

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Prominent role of sulfate reduction in robust sulfur retention in subtropical soil

Cited by 2 publications

References 31 publications

Effects of acid deposition control in China: a review based on responses of subtropical forests

Effects of acid deposition control in China: a review based on responses of subtropical forests

Prominent Role of Sulfate Reduction in Considerable Sulfur Retention in a Subtropical Soil

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