Water, Salt and Heat Influences on Carbon and Nitrogen Dynamics in Seasonally Frozen Soils in Hetao Irrigation District, Inner Mongolia, China

doi:10.1016/S1002-0160(17)60463-6

Pedosphere

Volume 29, Issue 5, October 2019, Pages 632-641

https://doi.org/10.1016/S1002-0160(17)60463-6 Get rights and content

Abstract

To investigate carbon (C) and nitrogen (N) dynamics in seasonally frozen 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.

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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

Abstract

Soil Biol Biochem

Soil Biol Biochem

Soil Biol Biochem

Soil Biol Biochem

Soil Biol Biochem

Soil Biol Biochem

Soil Biol Biochem

Soil Biol Biochem

Trends Biotechnol

Soil Biol Biochem

Appl Soil Ecol

Shallow groundwater effect on land surface temperature and surface energy balance under bare soil conditions: Modeling and description.

Hydrol Earth Syst Sci

A qualitative description of shallow groundwater effect on surface temperature of bare soil.

Hydrol Earth Syst Sci

Reconnoitering the effect of shallow groundwater on land surface temperature and surface energy balance using MODIS and SEBS.

Hydrol Earth Syst Sci

Long-term development of nitrogen fluxes in a coniferous ecosystem: Does soil freezing trigger nitrate leaching?

J Plant Nutr Soil Sci