| Abstract: | We analyzed groundwater-transported nitrogen (N) exports from 41 watershed segments that comprised 10 Cape Cod, Massachusetts watersheds to test the hypotheses that chemical form of N exports is related to land use and to length of flow paths through watersheds. In the absence of human habitation, these glacial outwash-plain watersheds exported largely dissolved organic N (DON) but at relatively low annual rate. Addition of people to watersheds increased rates of both total dissolved N (TDN) and DON export through groundwater. Percent of TDN as DON in groundwater was negatively related to path length of groundwater through aquifers, but %DON was not significantly related to population density on the watersheds. DON was often the dominant form of N exported from the watersheds, even at high population densities. Our results suggest that natural sources are not entirely responsible for organic N exports from watersheds, but, instead, a substantial portion of anthropogenic N introduced to watersheds is exported as DON. This finding is in disagreement with previous results, which suggest that anthropogenic N is exported from watersheds largely as NO 3- and that DON exported from watersheds is from natural sources. ?? 2006, by the American Society of Limnology and Oceanography, Inc. |
| Genre: | Article |
| ProdID: | 70028395 |
| Citation Author: | Kroeger, K. D.; Cole, M. L.; Valiela, I. |
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| Citation End Page: | 2261 |
| Citation Issue: | 5 |
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| Citation Language: | English |
| Citation Larger Work Title: | Limnology and Oceanography |
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| Citation Number Of Pages: | 14 |
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| Citation Search Results Text: | Groundwater-transported dissolved organic nitrogen exports from coastal watersheds; 2006; Article; Journal; Limnology and Oceanography; Kroeger, K. D.; Cole, M. L.; Valiela, I. |
| Citation Start Page: | 2248 |
| Citation Volume: | 51 |
| Citation Year: | 2006 |
| Type: | citation/reference |
| Text: | Groundwater-transported dissolved organic nitrogen exports from coastal watersheds; 2006; Article; Journal; Limnology and Oceanography; Kroeger, K. D.; Cole, M. L.; Valiela, I. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 2006 00:00 -0600 |
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