Precipitation is the key determinant of topsoil δ15N values in southern Patagonia's semiarid rangelands
Nitrogen (N) cycling in rangeland soils could potentially be controlled by water supply, stocking rates, or a range of other variables, such as ecosystem N stocks. To gauge the relative importance and elucidate possible interactions among these factors, we measured many abiotic variables to identify...
| Autores principales: | , , , |
|---|---|
| Formato: | Artículo |
| Lenguaje: | Inglés |
| Publicado: |
Soil Science Society of America
2022
|
| Materias: | |
| Acceso en línea: | https://hdl.handle.net/20.500.12955/1656 https://doi.org/10.1002/vzj2.20183 |
| _version_ | 1855490309643829248 |
|---|---|
| author | Peri, Pablo L. Duarte Guardia, Sandra Amelung, Wulf Ladd, Brenton |
| author_browse | Amelung, Wulf Duarte Guardia, Sandra Ladd, Brenton Peri, Pablo L. |
| author_facet | Peri, Pablo L. Duarte Guardia, Sandra Amelung, Wulf Ladd, Brenton |
| author_sort | Peri, Pablo L. |
| collection | Repositorio INIA |
| description | Nitrogen (N) cycling in rangeland soils could potentially be controlled by water supply, stocking rates, or a range of other variables, such as ecosystem N stocks. To gauge the relative importance and elucidate possible interactions among these factors, we measured many abiotic variables to identify first-order controls of δ15N for Patagonia's rangeland soils under contrasting historical grazing intensities. The results showed that δ15N values declined as water availability increased. The effects of precipitation and stocking rate on soil δ15N values were additive, and the effect of precipitation far outweighed the effects of grazing pressure. The soil N stock was a weak predictive variable for modeling variation in δ15N of the soil. Earlier assumptions about an inflection point for N cycling and δ15N values related to aridity were not confirmed. We conclude that variation in water availability drives variation in δ15N values irrespective of grazing intensity. We also conclude that meaningful interpretation of δ15N in soil will require a better mechanistic understanding of the interactions between water and N in the vadose zone than we currently possess. |
| format | Artículo |
| id | INIA1656 |
| institution | Institucional Nacional de Innovación Agraria |
| language | Inglés |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| publisher | Soil Science Society of America |
| publisherStr | Soil Science Society of America |
| record_format | dspace |
| spelling | INIA16562022-11-21T20:07:07Z Precipitation is the key determinant of topsoil δ15N values in southern Patagonia's semiarid rangelands Peri, Pablo L. Duarte Guardia, Sandra Amelung, Wulf Ladd, Brenton Topsoil Semiarid rangelands Environmental problems Nitrogen Patagonia https://purl.org/pe-repo/ocde/ford#4.01.04 Nitrogen (N) cycling in rangeland soils could potentially be controlled by water supply, stocking rates, or a range of other variables, such as ecosystem N stocks. To gauge the relative importance and elucidate possible interactions among these factors, we measured many abiotic variables to identify first-order controls of δ15N for Patagonia's rangeland soils under contrasting historical grazing intensities. The results showed that δ15N values declined as water availability increased. The effects of precipitation and stocking rate on soil δ15N values were additive, and the effect of precipitation far outweighed the effects of grazing pressure. The soil N stock was a weak predictive variable for modeling variation in δ15N of the soil. Earlier assumptions about an inflection point for N cycling and δ15N values related to aridity were not confirmed. We conclude that variation in water availability drives variation in δ15N values irrespective of grazing intensity. We also conclude that meaningful interpretation of δ15N in soil will require a better mechanistic understanding of the interactions between water and N in the vadose zone than we currently possess. Abstract. 1. Introduction. 2. Materials and Methods. 3. Results. 4. Discussion. 5. Conclusion. References. 2022-04-04T18:12:55Z 2022-04-04T18:12:55Z 2022-02-11 info:eu-repo/semantics/article Peri, PL , Duarte-Guardia, S. , Amelung, W. y Ladd, B. ( 2022 ). La precipitación es el determinante clave de los valores de δ 15 N del suelo en los pastizales semiáridos de la Patagonia austral . Vadose Zone Journal , 21 , e20183. doi: 10.1002/vzj2.20183 https://hdl.handle.net/20.500.12955/1656 Vadose Zone Journal https://doi.org/10.1002/vzj2.20183 eng Vadose Zone Journal Volume 21, Issue 2 e20183 https://doi.org/10.1002/vzj2.20183 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf application/pdf América del Sur Soil Science Society of America Estados Unidos Instituto Nacional de Innovación Agraria Repositorio Institucional - INIA |
| spellingShingle | Topsoil Semiarid rangelands Environmental problems Nitrogen Patagonia https://purl.org/pe-repo/ocde/ford#4.01.04 Peri, Pablo L. Duarte Guardia, Sandra Amelung, Wulf Ladd, Brenton Precipitation is the key determinant of topsoil δ15N values in southern Patagonia's semiarid rangelands |
| title | Precipitation is the key determinant of topsoil δ15N values in southern Patagonia's semiarid rangelands |
| title_full | Precipitation is the key determinant of topsoil δ15N values in southern Patagonia's semiarid rangelands |
| title_fullStr | Precipitation is the key determinant of topsoil δ15N values in southern Patagonia's semiarid rangelands |
| title_full_unstemmed | Precipitation is the key determinant of topsoil δ15N values in southern Patagonia's semiarid rangelands |
| title_short | Precipitation is the key determinant of topsoil δ15N values in southern Patagonia's semiarid rangelands |
| title_sort | precipitation is the key determinant of topsoil δ15n values in southern patagonia s semiarid rangelands |
| topic | Topsoil Semiarid rangelands Environmental problems Nitrogen Patagonia https://purl.org/pe-repo/ocde/ford#4.01.04 |
| url | https://hdl.handle.net/20.500.12955/1656 https://doi.org/10.1002/vzj2.20183 |
| work_keys_str_mv | AT peripablol precipitationisthekeydeterminantoftopsoild15nvaluesinsouthernpatagoniassemiaridrangelands AT duarteguardiasandra precipitationisthekeydeterminantoftopsoild15nvaluesinsouthernpatagoniassemiaridrangelands AT amelungwulf precipitationisthekeydeterminantoftopsoild15nvaluesinsouthernpatagoniassemiaridrangelands AT laddbrenton precipitationisthekeydeterminantoftopsoild15nvaluesinsouthernpatagoniassemiaridrangelands |