TY  - JOUR
A1  - Jones, Benjamin M.
A1  - Arp, Christopher D.
A1  - Whitman, Matthew S.
A1  - Nigro, Debora
A1  - Nitze, Ingmar
A1  - Beaver, John
A1  - Gadeke, Anne
A1  - Zuck, Callie
A1  - Liljedahl, Anna
A1  - Daanen, Ronald
A1  - Torvinen, Eric
A1  - Fritz, Stacey
A1  - Grosse, Guido
T1  - A lake-centric geospatial database to guide research and inform management decisions in an Arctic watershed in northern Alaska experiencing climate and land-use changes
JF  - AMBIO
N2  - Lakes are dominant and diverse landscape features in the Arctic, but conventional land cover classification schemes typically map them as a single uniform class. Here, we present a detailed lake-centric geospatial database for an Arctic watershed in northern Alaska. We developed a GIS dataset consisting of 4362 lakes that provides information on lake morphometry, hydrologic connectivity, surface area dynamics, surrounding terrestrial ecotypes, and other important conditions describing Arctic lakes. Analyzing the geospatial database relative to fish and bird survey data shows relations to lake depth and hydrologic connectivity, which are being used to guide research and aid in the management of aquatic resources in the National Petroleum Reserve in Alaska. Further development of similar geospatial databases is needed to better understand and plan for the impacts of ongoing climate and land-use changes occurring across lake-rich landscapes in the Arctic.
KW  - Arctic
KW  - Climate Change
KW  - GIS
KW  - Lakes
KW  - Land-use change
KW  - Watershed
Y1  - 2017
U6  - https://doi.org/10.1007/s13280-017-0915-9
SN  - 0044-7447
SN  - 1654-7209
VL  - 46
SP  - 769
EP  - 786
PB  - Springer
CY  - Dordrecht
ER  - 
TY  - JOUR
A1  - Neumann-Cosel, Luisa
A1  - Zimmermann, Beate
A1  - Hall, Jefferson S.
A1  - van Breugel, Michiel
A1  - Elsenbeer, Helmut
T1  - Soil carbon dynamics under young tropical secondary forests on former pastures-A case study from Panama
JF  - Forest ecology and management
N2  - Secondary forests are gaining increased importance in tropical landscapes and have recently been reported to act as potential belowground carbon sinks. While economic interest in the management of secondary forests to mitigate carbon emissions is rising, the dynamics of soil carbon stocks under these ecosystems remain poorly understood. Recent studies report conflicting results concerning soil carbon trends as well as multiple confounding factors (e.g. soil type, topography and land-use history) affecting these trends. In this study, organic carbon stocks were measured in the mineral soil up to 20 cm depth of at 24 active pastures, 5-8-year-old, and 12-15-year-old secondary forest sites on former pastures. Additionally, we estimated carbon stocks under a 100-year-old secondary forest and compared them to those of nearby mature forests. Abiotic conditions in the study area were homogenous, enabling us to isolate the effect of land-use change on soil organic carbon stocks. Contrary to our expectations, soil carbon stocks in the top 10 cm did not change with young secondary forest development. Pasture soils stored 24.8 +/- 2.9 Mg ha(-1) carbon (mean +/- standard error) in the top 10 cm, and no accumulation of soil carbon was apparent during the first 15 years of secondary succession. Soil carbon stocks under 100-year-old secondary forests, averaging 43.0 +/- 7.9 Mg ha(-1) (mean +/- standard error), were clearly higher than those recorded at younger sites and approached levels of soil carbon stocks under mature forests. These data indicate that soil carbon stocks in this region of Panama are not affected by the land-use transition from pasture to young secondary regrowth. However, an increase of soil carbon storage might be possible over a longer period of time. Our results support trends observed in other tropical areas and highlight the importance of environmental conditions such as soil properties rather than land-use transitions on soil carbon dynamics. While our understanding of organic carbon dynamics in tropical soils remains limited, these results underscore the challenges of undertaking short-term reforestation projects with the expectation of increasing soil carbon sequestration.
KW  - Soil carbon
KW  - Secondary forest
KW  - Pasture
KW  - Land-use change
KW  - C sequestration
KW  - Panama
Y1  - 2011
U6  - https://doi.org/10.1016/j.foreco.2010.07.023
SN  - 0378-1127
VL  - 261
IS  - 10
SP  - 1625
EP  - 1633
PB  - Elsevier
CY  - Amsterdam
ER  -