Table 9. Hierarchical grouping of ecodistricts and ecosubdistricts, and their areas, within Fort Greely

Figure 17. Geology of Fort Greely

Figure 18. Aerial views of ecosubdistricts within Fort Greely

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Table 9. Hierarchical grouping of ecodistricts and ecosubdistricts, and their areas, within Fort Greely.

Ecoregions*

Ecodistricts

Ecosubdistricts

Geomorphic Unit Codes†

Area (ha)

Alaska Range

Hayes Mountains

Molybdenum Ridge Mountains

Granite Mountains (Donnelly Dome)

Hayes Highland Plateaus

Gmo, Obv

12,802

Highlands

Donnelly Highland Plateau

Gmo, Obv

1,415

(Northern

Dinosaur Ridge Highlands

Bxr, Ct, Fsu, Fsl

22,951

Foothills of

Jarvis Creek Glaciated Highlands

Gmo, Gmy, Fsl, Obv, Ofsh

2,696

the Alaska

Delta River Glaciated Highlands

Gmo, Fsl, Obv, Ofsh

31,502

Range)

Little Delta River Glaciated Highlands

Gmo, Fsl, Obv, Ofsh

8,080

Little Delta River Highlands

Jarvis Creek Glaciated Lowlands

Elu, Ell, Gmo, Obv, Ofsh

19,662

Forested

(Tanana Flats to

Jarvis Creek Lowlands

Granite Creek Lowlands

Gfo

4,887

and Uplands

Delta River Glaciated Lowlands

Elu, Ell, Gmo, Obv, Ofsh

32,016

Delta River Lowlands

Gfo, Ell, Obv, Fmr, Fmci

21,816

Delta Creek Glaciated Lowlands

Gmo, Fsl

9,717

Upper Delta Creek Lowlands

Gfo, Fsl

8,537

Lower Delta Creek Lowlands

Fsr, Fsl, Gfo, Obv

23,327

Upper Little Delta River Lowlands

Gfo, Fsr, Obv

1,879

Lower Little Delta River Lowlands

Jarvis Creek Floodplain

Gfora, Gfori, Gfoci, Gforb,

Delta River Floodplain

Gfora, Gfori, Gfoci, Gforb,

12,766

Robertson River)

Wrug

Delta Creek Floodplain

Gfora, Gfori, Gfoci, Gfocb,

6,786

Wrug

Little Delta River Floodplain

Gfora, Gfori, Gfoci, Gforb,

3,744

Gfocb, Wrug

*Ecoregions from Ecoregions of Alaska (Gallant et al. 1995).

†Geomorphic codes follow mnemonic system, first letters are: B=Bedrock, C=Colluvial, E=Eolian, F=Fluvial, G=Glacial,

O=Organic, W=Waterbody (see Table 1).

tions, an ELS requires three types of efforts:

vegetation were identified using field survey data. The

association among ecosystem components also helped

An ecological land survey that inventories and ana-

identify linkages among ecosystems related to fire ef-

lyzes data obtained in the field.

fects and geomorphic processes, such as groundwater

An ecological land classification that classifies and

discharge, floodplain development, permafrost degra-

maps ecosystem distribution.

dation, and paludification. The association of vegeta-

An ecological land evaluation that assesses the ca-

tion structures (e.g., closed deciduous forests) with geo-

pabilities of the land for various land management

morphic units (e.g., inactive cover deposits) was used

practices.

to identify 47 ecotypes (local ecosystems) that were

effective at differentiating dominant species (e.g., bal-

Field surveys at 74 sites along seven toposequences

sam poplar in riverine moist broadleaf forest versus

and at an additional 178 ground-reference locations

paper birch in upland moist broadleaf forest) and flo-

were used to develop a better understanding of the eco-

ristic associations.

logical processes controlling landscape development in

Ecosystems were mapped at three spatial scales for

the study area. Co-varying relationships among physi-

the entire base. Ecotypes (1:50,000 scale) delineated

ography, geomorphology, hydrology, permafrost, and

areas with homogenous topography, terrain, soil, sur-

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