期刊
ECOSYSTEMS
卷 19, 期 3, 页码 387-395出版社
SPRINGER
DOI: 10.1007/s10021-015-9934-1
关键词
Disturbance; Fire regime; Succession; Multiple element limitation (MEL) model; Nitrogen stocks; Nutrient ratio
类别
资金
- National Science Foundation [DEB-1145815, 0949420]
- Direct For Biological Sciences
- Division Of Environmental Biology [1026415, 1440409] Funding Source: National Science Foundation
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1545558] Funding Source: National Science Foundation
- Division Of Environmental Biology
- Direct For Biological Sciences [0949420, 1026843] Funding Source: National Science Foundation
- Emerging Frontiers
- Direct For Biological Sciences [1145815] Funding Source: National Science Foundation
- Office Of Internatl Science &Engineering
- Office Of The Director [0966472] Funding Source: National Science Foundation
Disturbances affect almost all terrestrial ecosystems, but it has been difficult to identify general principles regarding these influences. To improve our understanding of the long-term consequences of disturbance on terrestrial ecosystems, we present a conceptual framework that analyzes disturbances by their biogeochemical impacts. We posit that the ratio of soil and plant nutrient stocks in mature ecosystems represents a characteristic site property. Focusing on nitrogen (N), we hypothesize that this partitioning ratio (soil N: plant N) will undergo a predictable trajectory after disturbance. We investigate the nature of this partitioning ratio with three approaches: (1) nutrient stock data from forested ecosystems in North America, (2) a process-based ecosystem model, and (3) conceptual shifts in site nutrient availability with altered disturbance frequency. Partitioning ratios could be applied to a variety of ecosystems and successional states, allowing for improved temporal scaling of disturbance events. The generally short-term empirical evidence for recovery trajectories of nutrient stocks and partitioning ratios suggests two areas for future research. First, we need to recognize and quantify how disturbance effects can be accreting or depleting, depending on whether their net effect is to increase or decrease ecosystem nutrient stocks. Second, we need to test how altered disturbance frequencies from the present state may be constructive or destructive in their effects on biogeochemical cycling and nutrient availability. Long-term studies, with repeated sampling of soils and vegetation, will be essential in further developing this framework of biogeochemical response to disturbance.
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