Titlebook: Material Cycling of Wetland Soils Driven by Freeze-Thaw Effects; Xiaofei Yu Book 2013 Springer-Verlag Berlin Heidelberg 2013

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Overview of the Study Area,l confluence of the Heilongjiang, Songhua and Ussuri rivers, and is one of China’s largest contiguous distribution areas of freshwater wetlands. It is also greatly affected by human activities, and is a region with one of the fastest reductions in natural wetland area (Liu and Ma .).

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,Freeze–Thaw Principles of Wetland Soils,of wetland ecosystems in many ways. As a type of abiotic stress, freeze–thaw can change the soil aggregates, permeability and mechanical properties. The freeze–thaw process also indirectly affects nutrient circulation, through its impact on soil microbial activity, gas release and the concentrations

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,Freeze–Thaw Effects on Sorption/Desorption of Dissolved Organic Carbon in Wetland Soils,), nutrient cycling, microbial activity, and organic matter decomposition and transformation in soils (Magill and Aber 2000; Williams et al. 2000). The sorption of DOC is the dominant factor in DOC concentration in soil solutions, transport and transformation and the microbial availability of DOC. I

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,Effect of Freeze–Thaw on the Mineralization of Organic Carbon, and Organic Nitrogen in Wetland Soilneral it is believed that the mineralization of organic carbon and organic nitrogen in soil mainly depends on the moisture and temperature. Conditions of soil moisture affect the soil respiration rate (Mainiero and Kazda 2004) by restricting the penetration of oxygen and the types of microorganisms,

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,Response of Soil Constituents to Freeze–Thaw Cycles in Wetland Soil Solution, soils and the leaching of nutrients through influencing biochemical and physicochemical processes. The soil solution nutrient pool in the freeze–thaw period may control the quantity of nutrients available to plants in the following spring (Buckeridge and Grogan 2008).

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