| Abstract: | We compiled new and published data on the natural abundance N isotope composition (??15N values) of soil and plant organic matter from around the world. Across a broad range of climate and ecosystem types, we found that soil and plant ??15N values systematically decreased with increasing mean annual precipitation (MAP) and decreasing mean annual temperature (MAT). Because most undisturbed soils are near N steady state, the observations suggest that an increasing fraction of ecosystem N losses are 15N-depleted forms (NO3, N2O, etc.) with decreasing MAP and increasing MAT. Wetter and colder ecosystems appear to be more efficient in conserving and recycling mineral N. Globally, plant ??15N values are more negative than soils, but the difference Nitrogen isotopes reflect time integrated measures of the controls on N storage that are critical for predictions of how these ecosystems will respond to human-mediated disturbances of the global N cycle. |
| Genre: | Article |
| ProdID: | 70025979 |
| Citation Author: | Amundson, R.; Austin, A. T.; Schuur, E. A. G.; Yoo, K.; Matzek, V.; Kendall, C.; Uebersax, A.; Brenner, D.; Baisden, W. T. |
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| Citation End Page: | 1 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Global Biogeochemical Cycles |
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| Citation Number Of Pages: | -29 |
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| Citation Search Results Text: | Global patterns of the isotopic composition of soil and plant nitrogen; 2003; Article; Journal; Global Biogeochemical Cycles; Amundson, R.; Austin, A. T.; Schuur, E. A. G.; Yoo, K.; Matzek, V.; Kendall, C.; Uebersax, A.; Brenner, D.; Baisden, W. T. |
| Citation Start Page: | 31 |
| Citation Volume: | 17 |
| Citation Year: | 2003 |
| Type: | citation/reference |
| Text: | Global patterns of the isotopic composition of soil and plant nitrogen; 2003; Article; Journal; Global Biogeochemical Cycles; Amundson, R.; Austin, A. T.; Schuur, E. A. G.; Yoo, K.; Matzek, V.; Kendall, C.; Uebersax, A.; Brenner, D.; Baisden, W. T. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 2003 00:00 -0600 |
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