DOI: 10.1029/2018JG004538
Scopus记录号: 2-s2.0-85050721368
论文题名: Nutrient Limitation and the Stoichiometry of Nutrient Uptake in a Tropical Rain Forest Stream
作者: Tromboni F. ; Thomas S.A. ; Gücker B. ; Neres-Lima V. ; Lourenço-Amorim C. ; Moulton T.P. ; Silva-Junior E.F. ; Feijó-Lima R. ; Boëchat I.G. ; Zandonà E.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 7 起始页码: 2154
结束页码: 2167
语种: 英语
英文关键词: autotrophic
; heterotrophic
; nutrient diffusing substrata
; nutrient spiraling
; periphyton
; TASCC
英文摘要: Nutrient limitation assessment is important to understand stream ecosystem functioning. Aquatic primary producers are often limited by nitrogen, phosphorus, or both, as assessed by nutrient diffusing substrata (NDS), a common method for assessing nutrient limitation in streams. But little is known regarding how this method relates to patterns of nutrient uptake at the whole-stream scale. We combined two techniques to examine nutrient limitation in a tropical stream. First, we conducted two NDS experiments using ammonium, nitrate, and phosphate alone and combined, to determine nutrient limitation at substrata scale over several weeks. Second, we conducted whole-stream nutrient addition experiments over the course of a year, using nutrients alone and in combination, to test theoretical predictions about uptake characteristics of limiting and nonlimiting nutrients. NDS results consistently indicated N limitation. Ambient uptake length (SW-amb) suggested either P limitation (shorter SW-amb for P than N) or colimitation (similar SW-amb for both nutrients). The relationship between N uptake and concentration when added alone or with P suggested P limitation, colimitation, or neither, depending on the date. We speculate that the different conclusions arise from differences in the spatial and temporal scale assessed by these techniques and the microbial processes involved, and the potential for physical processes influencing whole-stream uptake estimates. We conclude that nutrient limitation is not as categorical as NDS results often imply, rather habitat, resource, and biotic diversity result in nutrient uptake rates that do not necessarily conform to predictions drawn from fine scale, process-specific bioassays such as chlorophyll-a accrual on NDS. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113611
Appears in Collections: 气候减缓与适应
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作者单位: Department of Ecology, IBRAG, State University of Rio de Janeiro, Rio de Janeiro, Brazil; Now at Global Water Center and Biology Department, University of Nevada, Reno, NV, United States; School of Natural Resources, University of Nebraska-Lincoln, Lincoln, NE, United States; Department of Geosciences, Federal University of São João del-Rei, São João del-Rei, Brazil
Recommended Citation:
Tromboni F.,Thomas S.A.,Gücker B.,et al. Nutrient Limitation and the Stoichiometry of Nutrient Uptake in a Tropical Rain Forest Stream[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(7)