Hydrochemical Characteristics Jointly Determine the Transport and Cycling of Soil Carbon, Nitrogen, and Phosphorus in an Arid Chinese Wetland,Journal of Geophysical Research: Biogeosciences

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Hydrochemical Characteristics Jointly Determine the Transport and Cycling of Soil Carbon, Nitrogen, and Phosphorus in an Arid Chinese Wetland
Journal of Geophysical Research: Biogeosciences ( IF 3.7 ) Pub Date : 2020-05-11 , DOI: 10.1029/2020jg005697
Bing Liu ₁ , Wenzhi Zhao ₁ , Zijuan Wen ₂ , Yuting Yang ₃ , Xuexiang Chang ₁ , Zhaocen Zhu ₁ , Rui Si ₁

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Salt accumulation gradually changes the cycling of carbon (C), nitrogen (N), and phosphorus (P) and may even transform sinks into sources in arid wetlands. However, it's not clear how hydrochemical characteristics affect the wetland's source or sink function or how they affect C, N, and P cycling in arid regions. To clarify these relationships, we conducted field measurement in arid northern China. We simulated the variations of hydrochemical characteristics and the storage and stoichiometry of C, N, and P using the process‐based DeNitrification‐DeComposition (DNDC) and Hydrus‐1D models. The meteorological and hydrological processes had obvious characteristics of seasonal and interannual changes. The measured evapotranspiration averaged 660.23 and 587.94 mm year⁻¹ in the saltmarsh and riparian wetlands, respectively. The soil showed a clear trend with higher SO₄²⁻, Na⁺, Ca²⁺, and Cl⁻ fractions in comparison with lower Mg²⁺, K+, and HCO₃⁻ fractions, with the major ion and nutrient concentrations gradually decreasing with increasing depth in the soil. The major ion types had characteristics of Na⁺‐Ca²⁺‐SO₄²⁻‐Cl⁻ in the saltmarsh wetland and riparian wetland. The storage of total C, N, and P were 372.72 ± 66.52 t C/hm², 10.92 ± 2.59 t N/hm², and 17.55 ± 1.54 t P/hm² in the saltmarsh wetland versus 119.72 ± 27.88 t C/hm², 4.38 ± 1.24 t N/hm², and 13.17 ± 1.46 t P/hm² in the riparian wetland. Therefore, wetland salinization in our study led to increased soil C, N, and P contents and storage and thereby enhanced the sink function of the wetlands.

更新日期：2020-07-09

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