improving fine root sampling methods for landscape-level ecosystem studies using root anatomy and...
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Improving fine root sampling methods for landscape-level ecosystem studies using root anatomy and morphology
Kirsten Lloyd
M.S. Candidate
Complex Systems Research Center
University of New Hampshire, USA
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In the White Mountain National Forest, we know:
1) Foliar chemistry (e.g., nitrogen content) is related to forest productivity.
2) Hyperspectral methods allow remote-sensing of canopy chemistry.
HoweverHowever, theoretical links from aboveground to belowground , theoretical links from aboveground to belowground processes have not been established due to methodological difficulties.processes have not been established due to methodological difficulties.
My research is an initial step to My research is an initial step to include include belowground processesbelowground processes into an on-going campaign of into an on-going campaign of
landscape-level ecosystem studies. landscape-level ecosystem studies.
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Location of Bartlett Experimental Forest (BEF) in the White Mountain National Forest, New Hampshire, USA
10 km
Bartlett Experimental Forest
AVIRIS remote sensing scenes
Northeastern U.S.
White Mountain National
Forest, NH
360,000 ha
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A Landscape-Level Field Study in the A Landscape-Level Field Study in the White Mountain National ForestWhite Mountain National Forest
MMapping andapping and AAnalysis of nalysis of PProductivity androductivity and
BBioioggeochemicaleochemical CCyclingycling
Canopy Chemistry
Remote Sensing Field Work Modeling &Data Synthesis
ProductivityProductivity N Cycling,Nitrification
SoilMineralogy
Stream Chemistry
MAPBGCMAPBGC
LeafLeaf
ChemistryChemistry
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VEGETATION
400 800 1200 1600 2000 2400Wavelength (nm)
Refl
ecta
nce
0 0
.2 .4
. 6
.8
1.0
REMOTE SENSING OF FOLIAR N MAPBGCMAPBGC
W h i t e M o u n t a i n N a t i o n a l F o r e s t
AVIRIS EO-1Hyperi
on
0.50
1.00
1.50
2.00
2.50
3.00
0.50 1.00 1.50 2.00 2.50 3.00Field Measured %N
AV
IRIS
Pre
dic
ted
%N
R2 = 0.84
AVIRIS Foliar NPredicted (PLS) vs. Observed
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Hardwood
Conifer
Forest Productivity and Nitrogen StatusForest Productivity and Nitrogen Status
0
200
400
600
800
1000
0.5 1.0 1.5 2.0 2.5 3.0
AN
PP
(g
m-2
yr-1
)
Foliar N Concentration (%)
Aboveground NPP
Belowground Belowground Production not yet Production not yet known.known.
Smith et al. 2002 Ecol. App.
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Using Canopy N to Drive Ecosystem Models
Predicted NPP Using AVIRISBartlett Experimental Forest, NH
< 700< 700
600600
700700
800800
900900
10001000
>1300>1300
(g m(g m-2-2 yr yr-1-1))
Kilometers0 1
Old Sugar Maple on deep till soils
(540 m)
Upper elevation Spruce on shallow bedrock (800 m)
Eastern Hemlock(300 m)
Mixed White Pine on sandy outwash
(220 m)
Cut + NPK Fertilizer,
1963
N
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Root Root ChemistryChemistry
? ?
QUESTION:QUESTION:Are foliar and root
chemistry related?
Canopy Chemistry
Productivity Cycling,Nitrification
Mineralogy Chemistry
LeafLeaf
ChemistryChemistry
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PROBLEM:PROBLEM:In order to directly compare foliar and root chemistry, we must In order to directly compare foliar and root chemistry, we must be able to sample roots similarly to foliage (be able to sample roots similarly to foliage (by speciesby species).).
HOW CAN WE IMPROVE ROOT SAMPLING?HOW CAN WE IMPROVE ROOT SAMPLING?
Use secondary xylem anatomy to identify Use secondary xylem anatomy to identify woody rootswoody roots
Develop morphological parameters by Develop morphological parameters by species (or genus) for fine rootsspecies (or genus) for fine roots
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MethodsSampling: Roots were collected from soil pits dug at 9 plots within BEF. The plots represent a gradient of site fertility/productivity and species compositions. The roots of six angiosperm species (Acer rubrum L., Acer saccharum Marsh., Betula alleghaniensis Britt., Betula papyrifera Marsh. Fagus grandifolia Ehrh., and Fraxinus americana L.) and three gymnosperm species (Picea rubens Sarg., Pinus stobus L., and Tsuga canadensis (L.)Carr.) were sampled.
Anatomy: Secondary roots approximately 2 to10 mm in diameter were hand-sectioned on transverse and longitudinal planes. Unstained, fresh sections were examined using light microscopy. Roots were identified based on diagnostic traits of secondary xylem. Images were acquired using an Olympus Vanox microscope (Model BHT), Olympus U-PMTVC camera and ImagePro 4.0 image processing software.
Morphology: Ephemeral segments of identified roots were photographed on a 1-mm grid.
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Results: Gymnosperms
Species Resin ducts
Cross-field pitting Morphology
Picea rubens
present piceoid Cenococcum;
very fine
Pinus strobus
present fenestriform root hairs; dichotomousbranching
Tsuga canadensis
absent1 cupressoid perpendicularbranching
1 may have central axial resin canal in primary xylem
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Results: Angiosperms
Species Perforation plates
Vessel pitting
Vessel thickenings
Morphology
Acer sp. simple alternate spiral “beaded” short roots
Betula sp. scalariform alternate, minute
absent fine, smooth periderm
Fagus grandifolia
simple opposite or scalariform
absent wide rays (cross-section)
Fraxinus americana
simple alternate absent light-colored periderm
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Conclusions
Woody roots can be identified using Woody roots can be identified using secondary xylem anatomy.secondary xylem anatomy.
Ephemeral root morphology can be used Ephemeral root morphology can be used to identify fine roots for sampling. to identify fine roots for sampling.
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Project direction
Status Task
Complete Characterize morphological traits of fine roots to allow genus- or species-level identification.
Complete Sample foliage and ephemeral roots from tree species at the Bartlett Experimental Forest.
In progressAnalyze chemistry (e.g., carbon and nitrogen) to determine trends among foliage and roots.
Future Evaluate the potential for relationships among foliar and fine root tissue chemistry to be extended spatially using hyperspectral remote-sensing estimates of forest canopy chemistry.
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References
Smith, M.L., et al. 2002. Ecological Applications 12, 1286 – 1302.
Ollinger, S.V., et al. 2002. Ecology 83, 339-355.
Research support provided by the New Hampshire Space Grant
Consortium graduate fellowship program.