Spatial and seasonal distributions of soil sulfur in two marsh wetlands with different flooding frequencies of the Yellow River Delta, China

Abstract

a b s t r a c t Soil samples from 0 to 100 cm depth were collected in eight sampling sites (Sites A1, B1, C1 and D1; Sites A2, B2, C2 and D2) respectively along two 250-m length of sampling zones (Zone N and Zone S) from the Yellow River channel to a tidal creek in the short-term flooding and seasonal flooding wetland of the Yellow River Delta of China in fall of 2007 and spring of 2008 to investigate spatial and seasonal distribution patterns of total sulfur (TS) and their influencing factors. Our results showed that TS contents in both seasons in surface soil in Zone N increased with increasing distances away from the Yellow River channel except for Site D1 in fall. However, TS contents in both seasons in surface soil in Zone S showed a tendency of increasing and then decreasing with increasing distances away from the Yellow River channel. Relative to spring, the mean TS contents in surface soils were slightly higher in fall in Zone N, whereas an opposite tendency was observed in Zone S. The mean TS stocks were obviously higher in fall with 934.36 g/m 2 and 877.77 g/m 2 compared to those in spring with 729.85 g/m 2 and 696.78 g/m 2 in Zone N and Zone S, respectively. TS contents and stock generally declined with depth along soil profiles with one accumulation peaks at a soil increment of 40-60 cm. Topsoil concentration factors also indicated that TS had shallower distribution in soil profiles. Soil total carbon (TC), total nitrogen (TN), soil organic matter (SOM), salinity and silt exerted positive loadings on TS, while soil pH and depth exhibited a negative correlation with TS content.

Responses of soil CO2 and CH4 emissions to changing water table level in a coastal wetland

“…Coastal wetland in particular salt marsh has high concentrations of SO 4 2À , which inhibit CH 4 production due to competition of sulfate reducing bacteria with methanogens (Olsson et al, 2015). Previous study has demonstrated that soil sulphur had significant relationship with salinity in the Yellow River Delta (Lu et al, 2015). And the average concentrations sulphur in 0e30 cm soil was about 822.43 mg kg À1 , which was higher than the average value of total sulphur in world (Yu et al, 2014).…”

Polycyclic Aromatic Hydrocarbons in Sediments/Soils of the Rapidly Urbanized Lower Reaches of the River Chaohu, China

“…Third, the lower reaches of the Shiwuli River were straight, and the riverbed may have been silted up for a long time, resulting in poor water flow. Therefore, the soil was mainly composed of silt and clay fractions, which have larger specific surface areas and a higher adsorption capacity of elements [42]. This might also be beneficial for the enrichment of PAHs in clay within the ditch wetlands.…”

The effects of the reverse seasonal flooding on soil texture within the hydro-fluctuation belt in the Three Gorges reservoir, China

“…Flooding is an important environmental factor which has crucial effects on changes of soil texture and soil nutrients in riverbank ecosystem (Neill 1995;Hefting et al 2004;Yang et al 2006). Some previous studies indicated that flooding could promote soil particles depositing on riverbanks and improve soil physical and chemical properties (Banach et al 2009;Lee et al 2014;Lu et al 2016). However, other studies suggested that flooding induced the degradation of soil texture as it washed away much smaller soil particles (Campbell et al 2002).…”