Abstract
Water and heat transport is the focus of hydrological research in seasonal frost areas. Considering Sanjiang Plain as the study area, this study explored the influence of land use change on soil water and heat transport and the future trend of surface water and heat transport. The effects of land use change on soil water and heat transport were revealed using observation data from the Sanjiang Mire Wetland Experimental Station of the Chinese Academy of Sciences from the period of May 2016 to May 2017. The analysis found evident changes in the water and heat status of different land use types. During conversion from uplands to paddy fields, the surface soil moisture content increased, evapotranspiration increased by approximately 20%, surface infiltration decreased by about 50%, and surface heat flux increased. In a future climate change scenario, the change trend of soil water and heat condition was roughly consistent with the present situation, and the proportion of evapotranspiration of upland and paddy fields in precipitation decreased to 40% and 55%, respectively. These results can provide a theoretical basis for the rational utilization of land and water resources in Sanjiang Plain.
Highlights
The Intergovernmental Panel on Climate Change (IPCC) Fifth Assessment Report (AR5) states that the global mean temperature warmed by 0.85 ◦ C from 1880 to 2012 [1,2]
Climate warming has resulted in seasonal frost area change including a decrease in the areal extent of permafrost and seasonally frozen ground [3], a reduction in frozen soil depth in seasonally frozen ground, and an increase in active layer thickness [4,5,6,7]
Variation in soil moisture content can affect soil temperature redistribution [11], and the soil temperature gradient will affect the migration of soil moisture [12,13]
Summary
The Intergovernmental Panel on Climate Change (IPCC) Fifth Assessment Report (AR5) states that the global mean temperature warmed by 0.85 ◦ C from 1880 to 2012 [1,2]. Climate warming has resulted in seasonal frost area change including a decrease in the areal extent of permafrost and seasonally frozen ground [3], a reduction in frozen soil depth in seasonally frozen ground, and an increase in active layer thickness [4,5,6,7] These changes considerably impact surface hydrological and ecological processes [8]. After the reclamation of wetlands for dry lands in China, the saturated saturated water content of soil decreased [21], and freezing depth and melting time changed [22,23]. It. Plain,ona seasonally frozen area in northeast highlights highlights the effect of land use change surface water andsoil heat transport, and China. Of different land use types in the permafrost region through a future climate change scenario
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