Checking for non-preferred file/folder path names (may take a long time depending on the number of files/folders) ...
This resource contains some files/folders that have non-preferred characters in their name. Show non-conforming files/folders.
This resource contains content types with files that need to be updated to match with metadata changes. Show content type files that need updating.
Hydrologic and seasonal controls on organic matter pools and transformation in a forested headwater stream network_data
| Authors: |
|
|
|---|---|---|
| Owners: |
|
This resource does not have an owner who is an active HydroShare user. Contact CUAHSI (help@cuahsi.org) to determine if accessing this resource is possible. |
| Type: | Resource | |
| Storage: | The size of this resource is 5.4 MB | |
| Created: | May 06, 2024 at 11:45 p.m. | |
| Last updated: | May 07, 2024 at 12:26 a.m. | |
| Citation: | See how to cite this resource |
| Sharing Status: | Discoverable |
|---|---|
| Views: | 258 |
| Downloads: | 0 |
| +1 Votes: | Be the first one to this. |
| Comments: | No comments (yet) |
Abstract
Headwater streams are dynamic reactors, where flow largely controls carbon dynamics (C). Riverine C exists largely as dissolved and fine particulate organic matter (DOM<0.7 µm and 0.7 µm<FPOM<1 mm, respectively). Although FPOM contributes significantly to C stocks and stream metabolism, FPOM processing is often unaccounted for in stream C cycling measurements and budgets. To address this knowledge gap, we investigated OM fate across flow conditions at two sites in a forested stream network in Alabama, USA: the upstream headwaters and the downstream outlet of Pendergrass Creek. At each site, we quantified DOM and FPOM in surface water and the streambed as benthic organic matter (BOM) for one year. At both sites, we found that FPOM and BOM diluted with flow and increased during leaf-on, while DOM (as dissolved organic C) did not change with flow and increased during leaf-off. To assess the microbial metabolic activity (MMA) of different OM pools, we conducted resazurin-resorufin incubation assays as a proxy for respiration. Rates of MMA across all three OM pools decreased while particulate C:[N]itrogen ratios increased at higher flows, indicating more reactive OM is stored and respired at low flows. We observed that FPOM accounted for the majority of water column respiration across all flow conditions. Our findings, corroborated by a hydrologic model (Coupled Routing and Excess STorage [CREST]) of flowing network length, suggest that as flow regimes become more extreme with climate change, the quantity and reactivity of OM stored in headwater streams may shift, influencing C emissions and downstream resources.
Subject Keywords
Coverage
Spatial
Temporal
| Start Date: | |
|---|---|
| End Date: |
Content
How to Cite
This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
Comments
There are currently no comments
New Comment