Abstract
This study addressed the effects of land use and slope position on soil inorganic nitrogen and was conducted in small watersheds. The study covered three land use types: tropical cloud forest, grassland, and coffee crop. To conduct this research, typical slope small watersheds were chosen in each land use type. Slopes were divided into three positions: shoulder, backslope, and footslope. At the center of each slope position, soil sampling was carried out. Soil inorganic nitrogen was measured monthly during a period of 14 months (July 2005–August 2006) with 11 observations. Significant differences in soil NH4 +–N and NO3 −–N content were detected for both land use and sampling date effects, as well as for interactions. A significant slope position-by-sampling date interaction was found only in coffee crop for NO3 −–N content. In tropical cloud forest and grassland, high soil NH4 +–N and low NO3 −–N content were recorded, while soil NO3 −–N content was high in coffee crop. Low NO3 −–N contents could mean a substantial microbial assimilation of NO3 −–N, constituting an important mechanism for nitrogen retention. Across the entire land use set, the relationship between soil temperature and soil inorganic N concentration was described by an exponential decay function (N = 33 + 2459exp−0.23T, R 2 = 0.44, P < 0.0001). This study also showed that together, soil temperature and gravimetric soil water content explained more variation in soil inorganic N concentration than gravimetric soil water content alone.
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Acknowledgments
This research was supported by CONACYT (No. 43082). I would like to thank Lourdes Cruz Huerta and Ninfa Portilla for assisting with laboratory analyses and Rosario Landgrave for providing geographical information and a location map for the study sites.
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Campos C., A. Response of Soil Inorganic Nitrogen to Land Use and Topographic Position in the Cofre de Perote Volcano (Mexico). Environmental Management 46, 213–224 (2010). https://doi.org/10.1007/s00267-010-9517-z
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DOI: https://doi.org/10.1007/s00267-010-9517-z