In downloading this resource contents you are ethically bound to respect the terms of this license.
Please confirm that you accept the terms of this license below before you can do any downloads for this resource.
Resource License Agreement
This resource is shared under the Creative Commons Attribution CC BY.
In downloading this resource contents you are ethically bound to respect the terms of this license.
Please confirm that you accept the terms of this license below before you can do any downloads for this resource.
Please wait for the process to complete.
Redirecting to the referenced web URL
The content you have requested to access is not stored in HydroShare, and we can’t guarantee its availability,
quality, security, or size. If the externally linked content is large, access may take time.
Get file URL
You have requested the URL for a file that is within a Discoverable resource.
This resource has Private Link Sharing enabled.
This means that anyone with the link will be able to access the file,
but users without the link will not be permitted unless they have "view" permission on this resource.
You have requested the URL for a file that is within a Discoverable resource.
Only you and other HydroShare users who have been granted at least "view" permission will be able to access this URL.
If you want this URL to be publicly available,
change the sharing status of your resource to "public" or enable Private Link Sharing.
You have requested the URL for a file that is within a Private resource.
This resource has Private Link Sharing enabled.
This means that anyone with the link will be able to access the file,
but users without the link will not be permitted unless they have "view" permission on this resource.
You have requested the URL for a file that is within a Private resource.
Only you and other HydroShare users who have been granted at least "view" permission will be able to access this URL.
If you want this URL to be publicly available, change the sharing status of your resource to "public" or enable Private Link Sharing.
Choose coordinates
Checking for non-preferred file/folder path names (may take a long time depending on the number of files/folders) ...
The following files/folders contain non-preferred characters in their name.
This may result in problems and you are encouraged to change the name to follow the
HydroShare preferred character set.
Tropical forests store large amounts of Earth’s terrestrial carbon (C), but many tropical montane streams have low dissolved organic matter (DOM). This low availability of energy likely limits certain pathways of inorganic nitrogen (N) uptake, as evidenced by high rates of nitrification and predominance of nitrate (NO3-) in the total pool of dissolved nitrogen, seen in many tropical montane forests. To test this hypothesis of energy limitation to N cycling, we conducted a series of experiments to explore the influence of DOM availability on tropical stream N cycling. Nutrient pulse additions of NO3- with or without an added carbon (C) source (acetate or urea) were conducted in streams of the Luquillo Experimental Forest, Puerto Rico. In the absence of added DOM, NO3- uptake was either undetectable or had very long (>3,000 m) uptake lengths (Sw). When DOM was added with NO3-, NO3- Sw were much shorter (80 to 1,200 m), with the shortest lengths resulting from additions of acetate. Comparing uptake metrics of the added C sources, there was greater demand for acetate compared to urea and measurable urea uptake was detected much less frequently. During additions of NO3--only, ambient concentrations of dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) decreased in some cases, suggesting increased metabolic demand for energy from the ambient organic matter pool under elevated levels of inorganic nutrients. Collectively, these results demonstrate that pathways of inorganic nitrogen cycling are tightly tied to energy availability at this tropical site. The response of ambient DOC and DON to increases in NO3- concentrations points to important feedbacks between inorganic nitrogen and DOM including organic nitrogen. Understanding the controls on NO3- processing in these streams is important to predict network-scale exports of nitrogen from tropical ecosystems.
This resource contains links to external content. Linked content is
NOT stored in HydroShare, and we can't guarantee its availability, quality, or
security.
Confirm files deletion
This file will be permanently deleted. Consider saving a copy if it is
important to you. If this is the last file in the resource and it is public,
the sharing status will revert to private. If you are not the owner of
this resource, then an owner will need to reset this to public after a new
file has been added. If you want to replace this file, add the new file
first then delete the old one, so that sharing status does not change.
Comments
There are currently no comments
New Comment