Groffman,P.M., Butterbach-Bahl,K., Fulweiler,R.W., Gold,A.J., Morse,J.L., Stander,E.K., Tague,C., Tonitto,C. and Vidon,P.(2009): Challenges to incorporating spatially and temporally explicit phenomena (hotspots and hot moments) in denitrification models. Biogeochemistry, 93, 49-77.

『脱窒モデルに時空間的に明白な現象(その場所とその時間)を組み込むための挑戦』


Abstract
 Denitrification, the anaerobic reduction of nitrogen oxides to nitrogenous gases, is an extremely challenging process to measure and model. Much of this challenge arises from the fact that small areas (hotspots) and brief periods (hot moments) frequently account for a high percentage of the denitrification activity that occurs in both terrestrial and aquatic ecosystems. In this paper, we describe the prospects for incorporating hotspot and hot moment phenomena into denitrification models in terrestrial soils, the interface between terrestrial and aquatic ecosystems, and in aquatic ecosystems. Our analysis suggests that while our data needs are strongest for hot moments, the greatest modeling challenges are for hotspots. Given the increasing availability of high temporal frequency climate data, models are promising tools for evaluating the importance of hot moments such as freeze-thaw cycles and drying/rewetting events. Spatial hotspots are less tractable due to our inability to get high resolution spatial approximations of denitrification drivers such as carbon substrate. Investigators need to consider the types of hotspots and hot moments that might be occurring at small, medium, and large spatial scales in the particular ecosystem type they are working in before starting a study or developing a new model. New experimental design and heterogeneity quantification tools can then be applied from the outset and will result in better quantification and more robust and widely applicable denitrification models.

Keywords: Denitrification; Nitrogen; Riparian; Sediment; Soil; Stream』

Introduction
Hotspots and hot moments in soils
 Temporal heterogeneity
 Spatial heterogeneity
 Modeling terrestrial hotspots and hot moments using existing models
Terrestrial/aquatic boundaries as hotspots
 Incorporating interface hotspots into models
Hotspots and hot moments in aquatic ecosystems
 Incorporating aquatic hotspots and hot moments into models
Hotspots, hot moments and environmental decision making: a case study from the northeastern US
Conclusions
Acknowledgments
References


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