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8/6/2019 Del Fierro Maningas
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CONTRASTING CLIMATIC
CONTROLS
ON THE ESTIMATED
PRODUCTIVITY
OF GLOBAL TERRESTRIAL
BIOMES
Galina Churkina and Steven W. Running
School of Forestry, University of Montona, Missoula, Montona 59812, USA
Reporters:
J.A.C. ManingasJ.M. del FIerro
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Definition of Terms
NPP-or net primary productivity represents the greatest annual
carbon flux from the atmosphere to the biosphere.
-causes fluctuation in atmospheric CO2 concentration.-it is the difference between the GPP and autotrophic
respiration
BIOME-BGC
-simulates global terrestrial NPP and assesses relativeimportance of climatic control (temperature, wateravailability and radiation) in limiting NPP in the arrayof climatic combinations found globally.
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Scope and Limitations
The study compares 7 different biomes.
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Deciduous Needle Leaf Forest
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Deciduous Broad Leaf Forest
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Evergreen Needle Leaf Forest
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Evergreen Broad leaf Forest
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Desert Shrubland
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C3 Grassland
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C4 Grassland
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Scope and Limitation Contd
The Study was conducted only in the
terrestrial biomes, no further
experimentation on the aquatic biomes were
mentioned on this study.
The study was conducted within a span of
one year, for the whole globe w/daily climate
based from CLIMATE
database
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Objectives
Determine areas of the globe whereclimactic control on NPP were importantand areas where nutrient availability/
biological constraints limited NPP morethan climate
Analyze relative contributions oftemperature and water availability to
potential vegetation productivity patternsaround the globe and to productivity ofdifferent biomes
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Methods
BIOME-BGC was used to estimate vegetationproductivity around the globe
NPP was calculated in terms of gas exchange @ 0.5x 0.5 spatial resolution
All computations were based on a 1 yr model runfor the whole globe w/daily climate based fromCLIMATE database.
7 biomes were considered in the model and wasclassified based on the following properties:
forest vs. grassesevergreen vs. decidious
broadleaf vs. needleleaf
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Methods
Factors that were studied as NPP-limiting
are temperature, water availability and
radiation
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Hypothesis
NPP or vegetation productivity is a result ofinteractions among several environmental
factors.
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Results
The productivity of most terrestrial
ecosystems was controlled by more than one
climactic factor, while NPP of some biomes
were not controlled by NPP at all.
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Results
In high latitudes(dark blue), temp.
appeared to be the
primary control on
NPP
In middle latitudes acombination of either
temperateure and
radiation (shades of
cyan) or temperature
and water availability(shades of magenta)
In lower latitudes,
water availability
(bright red) became
more dominant thanthe other 2 factors.
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Results
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Results
None of the climactic factors were limiting in
the tropical regions of South America, Africa
and South East Asia (dark grey to black on
the map)
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Conclusion
Productivity is controlled by more than oneenvironmental factor
Water availability and temperature affects NPP the
most, followed by radiation at 5% No climatic parameter appeared to limit vegetation
productivity in some areas of the globe particularly inthe tropical regions.
The map in the results can help determine what areas ofthe globe can be affected by environmental factors asidefrom climate.
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