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Water, Salt and Heat Influences on Carbon and Nitrogen Dynamics in Seasonally Frozen Soils in Hetao Irrigation District, Inner Mongolia, China
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering. Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Hubei, Peoples R China ; Nanjing Univ, Int Inst Earth Syst Sci, Nanjing 210023, Jiangsu, Peoples R China.
Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Hubei, Peoples R China.
Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Hubei, Peoples R China.
Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Hubei, Peoples R China.
2019 (English)In: Pedosphere, ISSN 1002-0160, E-ISSN 2210-5107, Vol. 29, no 5, p. 632-641Article in journal (Refereed) Published
Abstract [en]

To investigate carbon soils under saline and shallow groundwater supply conditions, in-situ lysimeter experiments with different groundwater table depths (WTD = 1.8 and 2.2 m) were conducted in Inner Mongolia, China during the wintertime of 2012-2013. Changes in soil organic C and total N in multiple layers during various periods, as well as their relationships with soil water, salt, and heat dynamics were analyzed. Accumulation of soil organic C and total N during freezing periods was strongly related to water and salt accumulation under temperature and water potential gradients. Water and salt showed direct influences on soil C and N dynamics by transporting them to upper layer and changing soil microbial activity. Salt accumulation in the upper layer during freezing and thawing of soil affected microbial activity by lowering osmotic potential, resulting in lower C/N ratio. Nitrogen in soil tended to be more mobile with water during freezing and thawing than organic C, and the groundwater table also served as a water source for consecutive upward transport of dissolved N and C. The changes in C and N in the upper 10 cm soil layer served as a good sign for identification of water and salt influences on soil microbial activity during freezing/thawing.

Place, publisher, year, edition, pages
SCIENCE PRESS , 2019. Vol. 29, no 5, p. 632-641
Keywords [en]
freezing and thawing, groundwater, microbial activity, salt accumulation, soil organic carbon, total nitrogen
National Category
Earth and Related Environmental Sciences
Research subject
Geodesy and Geoinformatics
Identifiers
URN: urn:nbn:se:kth:diva-261942DOI: 10.1016/S1002-0160(17)60463-6ISI: 000487578400009Scopus ID: 2-s2.0-85072551726OAI: oai:DiVA.org:kth-261942DiVA, id: diva2:1361196
Note

QC 20191015

Available from: 2019-10-15 Created: 2019-10-15 Last updated: 2019-11-26Bibliographically approved

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