Distribution Characteristics of Sulfur Forms and Its Affecting Factors in Soils of the Newly Created Wetland in the Yellow River Estuary
In September 2020,the sampling sites were set up in the Suaeda salsa saltmarsh and Tamarix chinensis saltmarsh in the newly created marsh of the northern Yellow River estuary,and the soil samples were collected from different depths to compare the distributions characteristics of total sulfur,total inorganic sulfur and inorganic sulfur forms(H2O-S,Adsorbed-S,HC1-Soluble-S,HC1-Volatile-S)in soils and identify their key affecting factors.The results showed that the total sulfur contents in soils(0-60 cm)of Suaeda salsa saltmarsh and Tamarix chinensis saltmarsh ranged from 804.96 mg/kg to 881.50 mg/kg,with a moderate level across the marsh soils in China.However,the values were much higher than the average content of total sulfur in soils of world(700 mg/kg).The total sulfur contents in soils of Suaeda salsa saltmarsh and Tamarix chinensis saltmarsh were approximated and their higher values generally occurred in deep soil layers(30-60 cm).The proportions of total inorganic sulfur in total sulfur in soils of Suaeda salsa saltmarsh and Tamarix chinensis saltmarsh were generally high and the values varied between 24.02％and 42.94％and from 17.53％to 29.22％,respectively.The stock of total inorganic sulfur in soil of Suaeda salsa saltmarsh was 1.6 times of Tamarix chinensis saltmarsh and the former showed higher sulfur supply capacity.The contents of H2O-S,Adsorbed-S and HC1-Soluble-S in soils of Suaeda salsa saltmarsh were much higher than those of Tamarix chinensis saltmarsh as a whole,while the values of HC1-Volatile-S in soils of Tamarix chinensis saltmarsh were much higher than those of Suaeda salsa saltmarsh.In the vertical direction,the contents of H2O-S in soils of Suaeda salsa saltmarsh and the values of HCl-Soluble-S in soils of Suaeda salsa saltmarsh and Tamarix chinensis saltmarsh were generally high in shallow soil layers(0-30 cm),while the levels of other inorganic sulfur forms were generally high in deep soil layers.The distributions of sulfur forms in soils of Suaeda salsa saltmarsh were mainly depended on soil grain composition and soil organic carbon,while those of Tamarix chinensis saltmarsh were primarily controlled by soil organic carbon and nitrogen nutrient.
total sulfurinorganic sulfur formsSuaeda salsa saltmarshTamarix chinensis saltmarshYellow River estuary
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万方数据
