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Leaching of organic carbon from grassland soils under anaerobiosis
Zhu, Erxiong1; Liu, Ting; Zhou, Lei1; Wang, Simin1; Wang, Xin1; Zhang, Zhenhua2; Wang, Zhengwen3; Bai, Yongfei1; Feng, Xiaojuan1
AbstractThe projected increase of extreme precipitation and freeze-thawing events may lead to frequent occurrence of anaerobiosis in upland soils, which has significant impacts on biogeochemical processes affecting soil carbon loss. However, compared to mineralization, the impacts of anaerobiosis (potentially accompanied by fermentation) on soil organic carbon (SOC) leaching is limited. Here we conducted microcosm and intact soil column incubation experiments to examine processes influencing SOC leaching from four typical Chinese grassland soils under simulated anaerobiosis. Compared to aerobiosis, non-fermenting anaerobiosis increased the pH, dissolved phenol concentrations and aromaticity of soil leachates. In contrast, fermenting anaerobiosis induced acetate accumulation, lowered pH, stimulated phenol oxidative activity and generally decreased aromaticity in soil leachates in both microcosm and soil column experiments relative to aerobiosis. Both anaerobiosis potentially induced a strong release of dissolved organic carbon (DOC) accompanied by iron and nitrate reduction, especially with fermentation. However, DOC in soil leachates decreased in alpine subsoils under fermentation relative to aerobiosis. This interesting phenomenon was mainly attributed to (i) minimal iron reduction and dissolution in the alpine subsoils and (ii) enhanced DOC oxidation by elevated phenol oxidative activity in the fermentation relative to aerobiosis treatments. These results collectively indicate that anaerobiosis may increase SOC leaching and its magnitude is dependent on the extent of iron reduction and pH variations. Fermentation-enhanced release of ferrous iron and acetate may have an even stronger influence on the downstream biogeochemistry. Hence, temporary anaerobiosis warrants better recognition and investigation in the Mongolian (relative to Qinghai-Tibetan) grasslands that show high soil iron reduction potentials and are predicted to experience increased extreme precipitation in the future.
KeywordDissolved organic carbon Temperate grassland Alpine grassland Iron reduction Anaerobic fermentation
Subject AreaSoil Science
Indexed BySCI
WOS Research AreaAgriculture
WOS IDWOS:000513986700014
Publication PlaceOXFORD
Funding OrganizationStrategic Priority Research Program of the Chinese Academy of SciencesChinese Academy of Sciences [XDA19050403] ; Chinese National Key Development Program for Basic Research [2017YFC0503902, 2015CB954201] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41773067, 41603076] ; Chinese Academy of Sciences Interdisciplinary Innovation Team [JCTD2018-06]
Corresponding Author Emailxfeng@ibcas.ac.cn
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Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810008, Peoples R China
4.Chinese Acad Sci, Inst Appl Ecol, Erguna Forest Steppe Ecotone Res Stn, Shenyang 110164, Peoples R China
Recommended Citation
GB/T 7714
Zhu, Erxiong,Liu, Ting,Zhou, Lei,et al. Leaching of organic carbon from grassland soils under anaerobiosis[J]. SOIL BIOLOGY & BIOCHEMISTRY,2020,141.
APA Zhu, Erxiong.,Liu, Ting.,Zhou, Lei.,Wang, Simin.,Wang, Xin.,...&Feng, Xiaojuan.(2020).Leaching of organic carbon from grassland soils under anaerobiosis.SOIL BIOLOGY & BIOCHEMISTRY,141.
MLA Zhu, Erxiong,et al."Leaching of organic carbon from grassland soils under anaerobiosis".SOIL BIOLOGY & BIOCHEMISTRY 141(2020).
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