Overwhelming evidence reveals that concentrations of dissolved organic @entity505 ( @entity4420 ) have increased in streams which brings negative environmental impacts. @entity4420 in stream flow is mainly originated from soil-water solutions of watershed. Wetlands prove to be the most sensitive areas as an important @entity4420 reserve between terrestrial and fluvial biogeosystems. This reported study was focused on the distribution characteristics and the controlling factors of @entity4420 in soil-water solutions of annular wetland, i.e., a dishing wetland and a forest wetland together, in the Sanjiang Plain, Northeast China. The results indicate that @entity4420 concentrations in soil-water solutions decreased and then increased with increasing soil depth in the annular wetland. In the upper soil layers of 0-10 cm and 10-20 cm, @entity4420 concentrations in soil-water solutions linearly increased from edge to center of the annular wetland (R2 = 0.3122 and R2 = 0.443). The distribution variations were intimately linked to @entity4420 production and utilization and @entity4420 transport processes in annular wetland soil-water solutions. The concentrations of total organic @entity505 (TOC), total @entity505 (TC) and @entity8798 , @entity4420 mobility and continuous vertical and lateral flow affected the distribution variations of @entity4420 in soil-water solutions. The correlation coefficients between @entity4420 concentrations and TOC, TC and @entity8798 were 0.974, 0.813 and 0.753 respectively. These distribution characteristics suggested a systematic response of the distribution variations of @entity4420 in annular wetland soil-water solutions to the geometry of closed @entity308 on a scale of small catchments. However, the @entity4420 in soil pore water of the annular wetland may be the potential source of @entity4420 to stream flow on watershed scale. These observations also implied the fragmentation of wetland landscape could bring the spatial-temporal variations of @entity4420 distribution and exports, which would bring negative environmental impacts in watersheds of the Sanjiang Plain.

Distribution characteristics of dissolved organic XXXX in annular wetland soil-water solutions through soil profiles in the Sanjiang Plain, northeast China.

@entity505 :: ('MESH:D002244', 'Chemical') :: ['carbon'] @entity8798 :: ('CHEBI:29033', 'Chemical') :: ['Fe(II)'] @entity4420 :: ('CHEBI:16973', 'Chemical') :: ['DOC'] @entity308 :: ('MESH:D003866', 'Disease') :: ['depressions']
@entity505 :: (MESH:D002244,Chemical) :: ['carbon']
