Distribution and storage of soil organic and inorganic carbon in steppe riparian wetlands under human activity pressure

作者：Xinyu Liu, Xixi Lu, Ruihong Yu, Heyang Sun, Xiangwei Li, Xiang Li, Zhen Qi, Tingxi Liu, Changwei Lü · 发表于：Ecological Indicators · 年份：2022 · DOI：10.1016/j.ecolind.2022.108945 · 被引用次数：40 · 研究领域：Soil erosion and sediment transport、Coastal wetland ecosystem dynamics、Soil and Water Nutrient Dynamics

Soil organic carbon (SOC) and soil inorganic carbon (SIC) are key components of the global wetland soil carbon pool, which plays a crucial role in carbon cycling. However, research on carbon storage in riparian wetland soils, especially in inland steppe river environments impacted by human activities, is relatively scarce. Thus, we evaluated the SOC and SIC distributions and storage in riparian wetland soils under the pressure of human activities in the Xilin River Basin (XRB). We collected surface and profile soil samples, determined the SOC and SIC contents, aboveground biomass, and soil physicochemical properties, and calculated the SOC and SIC storage (SOCs and SICs) values. The surface soil SOC content decreased substantially from the upstream to the downstream zones (mean value range: 76.30–3.18 g/kg), and the SIC content showed the opposite trend (mean value range: 0.08–34.38 g/kg). The SIC content of the riparian wetlands along the permanently flowing stretch of river was much lower than that in the wetlands along the intermittently flowing stretch. In the XRB, the SOCs was primarily affected by vegetation coverage, soil water content, and soil pH, whereas the SICs was greatly affected by soil texture. A dry lake zone was markedly affected by wetland degradation, indicating a potential increase in the decomposition rate of the surface soil SOC; however, the SOC in the deep soils was relatively stable. The high SIC content most likely resulted from weathering, resuspen...