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Dissolved organic carbon characteristics in surface ponds from contrasting wetland ecosystems: a case study in the Sanjiang Plain, Northeast China
| Content Provider | Semantic Scholar |
|---|---|
| Author | Wang, L. L. Song, Changchun Yang, Guisheng |
| Copyright Year | 2013 |
| Abstract | Dissolved organic carbon (DOC) is a significant component of carbon and nutrient cycling in fluvial ecosys- tems. Natural wetlands, as important DOC sources for river and ocean ecosystems, have experienced extensive natural and anthropogenic disturbances such as climate change, hy- drological variations and land use change in recent years. The DOC characteristics in surface ponds from contrasting wet- lands in the Sanjiang Plain, Northeastern China were inves- tigated. Surface ponds at seven sites (two natural phialiform wetlands, three natural riparian wetlands, one degraded wet- land and one artificial wetland, i.e., rice paddy) were moni- tored during the growing seasons of 2009 and 2010. The re- sults show that the surface ponds at the five natural wetland sites exhibited a wide range of DOC concentrations (10.06- 48.73 mg L 1 ) during the study period. The DOC concentra- tions showed no annual differences (P > 0.05) at all the wet- land sites, except one of the phialiform wetland sites. The two phialiform wetlands exhibited higher DOC concentra- tions than the three riparian wetlands (P < 0.05). The DOC concentration in the surface pond at the artificial wetland site was relatively low (P < 0.05) compared to that at the de- graded wetland site. The C/C ratios (the color per carbon unit ratio, Abs 400 /DOC concentration) showed inconsistent vari- ations among these seven wetland sites, while the E4/E6 ra- tio (Abs 465 /Abs 665 , fulvic acid/humic acid) from the surface pond in the rice paddy land exerted 42.07-55.36 % reduc- tions (P < 0.05), compared to those at the five natural wet- land sites. Furthermore, the E4/E6 ratio in the surface pond at the rice paddy site was significantly lower compared to that at the degraded wetland site (P < 0.05), which indicated that disturbance to wetland DOC in surface ponds might be stronger when natural wetlands were converted to rice paddies in comparison with wetland degradation. This study could not only provide insightful points for understanding the aquatic DOC dynamics from different wetland ecosys- tems, but also support data information for incorporating the aquatic DOC into the model for regional carbon budgets in the future. |
| Starting Page | 371 |
| Ending Page | 378 |
| Page Count | 8 |
| File Format | PDF HTM / HTML |
| DOI | 10.5194/hess-17-371-2013 |
| Volume Number | 17 |
| Alternate Webpage(s) | https://www.hydrol-earth-syst-sci.net/17/371/2013/hess-17-371-2013.pdf |
| Alternate Webpage(s) | https://doi.org/10.5194/hess-17-371-2013 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
