6. A quantidade de carbono no planeta permanece
relativamente constante mas estamos mudando as
suas formas e quantidades de carbono líquido /
sólido / gás
(Cole et al., 2007;
Tranvik et al., 2009)
7.
8. Entrada direta de CO2
Algumas vias de entrada, saída e processamento de carbono em lagos e lagoas
costeiras. Fonte: http://cienciahoje.uol.com.br/noticias/2011/01/lagos-e-rios-no-ciclo-
de-carbono
11. By complete budget, we mean measures of:
(1) the major allochthonous inputs from surface water,
groundwater groundwater, and atmospheric
deposition;
(2) losses due to outflow, sediment burial;
(3) autochthonous primary production and ecosystem
respiration.
These are the minimum fluxes needed for OC budgets to
place lakes in a larger landscape context.
12. Porque é difícil obter o budget?
• Entradas são variáveis no tempo e no espaço
• Entradas difusivas do ambiente terrestre são
difíceis de medir
• Processos internos são variáveis no tempo e
no espaço
• Heterogeneidade do sedimento
13.
14.
15. Experiência na ESEC Seridó – Natal, RN
• PP e R na coluna d’água
• Variação diária do OD na coluna d’água
• Carbono no sedimento
• Emissão de CO2 e CH4
Modelos!!!!!
Parâmetros
básicos
17. Ten unasnwered questions:
• Lakes at the interface
• Internal cycling and lakes as sinks
• Lakes within changing climate and changing
landscapes
18. Q1: What are the Allochthonous Loads to
Lakes, How are They Partitioned Among
Sources, and How are Loads Driven by Events?
Q2: How does Control over Gas Exchange Vary
by Lake and What are the Underlying Physical
Factors Governing the Differences?
Q3: How Does the Source of Allochthonous OC
That is Loaded (That is, Fluvial OC, Leaf Fall,
Peat Pore Water, and So on) Determine Its Fate
in Lakes?
Q4: Do the Estimated Fates for Allochthonous
OC Match Estimates of External Loads?
Q5: What are OC Respiration Rates for Lake
Ecosystems? Q6: What Controls Burial Rates of OC, and
What are the Origins of Buried OC?
19. Q8: How is OC Cycling Coupled with Nutrients,
Such As Phosphorus (P) and Nitrogen (N), and
Do the Interactions Change Across Trophic
States?
Q9: What are the Key Gradients over Which to
Study Lake OC Cycling?
Q10: How will Changing Land Use and Climate
Alter Lake OC Cycling?
Q7: What are the Relative Concentrations of
OC Derived from Internal Net Primary
Production (NPP) Versus Allochthonous OC
Loading to Budgets and to Aquatic Consumers?
20. Contributions to Ecosystem Science
• Individual lakes
• Lake-rich regions
• Globe
Long term changes in lake OC processes
Nitrogênio e Fósforo
Estratégias de
gerenciamento da
eutrofização