Exact(36)
The study can show that although the dominant source of DOC was organic soils, there was significant DOC export from urban and grazed land on mineral and organo-mineral soils, but not from arable land.
The processes, sorption-desorption and microbial decomposition (DOC production and mineralization) are found to contribute most to the variance in DOC export based on a detailed variance-based Sobol sensitivity analysis (SA) at grid cell-level.
Overall, results pointed to a two-phase DOC export whereby mobile and bioavailable fractions of DOC in surface water (protein-like DOC) are produced throughout the watershed (including the wetland), while recalcitrant humic-like DOC fractions are predominantly generated by the wetland, before preferentially sedimenting out in the lake.
However, DOC export is often neglected in ecosystem models.
On average, subsurface tile drainage comprised 33% of monthly watershed DOC export (<1 82%).
The extended LPJ-GUESS is compared to observed DOC export at Stordalen catchment in northern Sweden.
Similar(24)
Given the significant amount of riverine DOC exported from agricultural landscapes during severe weather events, our results suggest that changes in climate promote larger precipitation events that would likely enhance the export of terrestrial DOC to receiving water bodies.
Reconstructed DOC exports from forested catchments in the period 1901 2012 follow largely a sinusoidal pattern, with a period of about 37 years and are tightly linked to multi-decadal patterns of precipitation.
These results revealed that ca. 76.5% of annual DOC was exported during a handful of storm-discharge events (78.9% for spring and 74.2% from autumn) over agricultural landscapes.
These stream networks were monitored for both their DOC concentration and export (flux per unit area).
These results indicate that in addition to the well documented contributions of DOC, tidally driven export from mangroves represents a significant potential source of Hg and MeHg to nearby coastal waters.
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