期刊
JOURNAL OF ARID ENVIRONMENTS
卷 109, 期 -, 页码 1-5出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jaridenv.2014.04.012
关键词
Ammonia; Grazing; Nitrate; Soil moisture; Total nitrogen; Wet meadows
资金
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CoNICET)
- Instituto Nacional de Tecnologia Agropecuaria (INTA) [PATNOR-810342]
- Ecosystem Science Center at Michigan Technological University
Wet meadows are seasonally saturated wetlands that can develop in arid and semi-arid areas. In the semi-arid region of North Patagonia, Argentina wet meadows are islands of high net primary productivity surrounded by low productivity steppe vegetation. Because of this, Patagonian wet meadows have been heavily grazed by livestock for more than a century. It has been shown that overgrazed wet meadows have lower soil carbon, however, little is known about how overgrazing impacts N dynamics. To this end, we measured ammonium (NH4+), nitrate (NO3-), and total nitrogen (Nt) in paired wet meadows that varied in long-term grazing intensity (heavy vs. light). Results indicate that heavily grazed sites had on average 43% less Nt and 57% less NH4+ than lightly grazed sites. Soil NH4+ concentrations were always significantly greater than NO3- concentrations, being the later often below detection levels. In addition, NH4+ concentrations were correlated with soil moisture in lightly grazed sites, but not in heavily grazed sites. These findings indicate that implementation of better management practices are currently needed to promote more sustainable grazing in semi-arid wet meadows of North Patagonia. (C) 2014 Elsevier Ltd. All rights reserved.
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