Ecological Site Description Ecological Site Characteristics Site Identification




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FOTG Section II. Natural Resources Information F. Ecological Site Descriptions

F159AY500HI – Tall Stature Wet Koa-Ohia/Hapu`u Forest



Ecological Site Description

Ecological Site Characteristics


Site Identification

Site Type: Forestland

Site ID: F159AY500HI

MLRA: 159A

Colloquial Site Name: Tall Stature Wet Koa – Ohia/Hapu`u Forest

Official Site Name: Acacia koa-Metrosideros polymorpha/Cibotium menziesii/Freycenetia arborea


Soils data from 1973 survey pending new soil survey.

Physiographic Features

This ecological site occurs on volcanic ash flows on sloping mountainsides of shield volcanoes. Ash flows range from deep to very deep on the underlying lava.




Landform: (1) volcanic ash flow
Landform: (2)
Landform: (3)

Minimum

Maximum

Elevation (feet):

1200

6400

Slope (percent):

0

35

Water Table Depth (inches):

--

--

Flooding:
Frequency:
Duration:


none
--



none

--

Ponding:
Depth (inches):
Frequency:
Duration:


--
--





--
--
--



Runoff Class:

low

medium

Aspect: (1) E
Aspect: (2) N








Climatic Features

Average annual precipitation ranges from 50 to 140 inches. Most of the precipitation falls from November through April, with April being the wettest month. Average annual temperature ranges from 54 to 71 degrees F. The climate generally can be classified as udic and tropical in nature.


Climate chart




Minimum

Maximum

Frost Free Period (days):

365

365

Freeze Free Period (days):

365

365

Mean Annual Precipitation (inches):

50

140



Monthly Precipitation (inches) and Temperature (0F)

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Precip. Avg.

14.0

19.0

21.2

22.8

17.4

9.7

15.1

18.3

10.5

15.5

21.2

21.1

Temp. Max.

73.1

72.6

72.7

73.4

74.2

75.9

76.3

76.9

77.6

77.0

75.4

72.9

Temp. Min.

60.7

59.7

60.1

61.4

62.4

63.7

64.3

65.2

64.6

64.2

63.1

61.3

Climate Station: (1)

Honomu Mauka 138, 1949-1978



Influencing Water Features

This ecological site contains perennial streams in very deep, steep-sided gulches. The sides and bottoms of these gulches are dominated by alien trees, particularly African tulip tree (Spathodea campanulata), Alexandrian palm (Archontophoenix alexandrae), kukui (Aleurites moluccana), and gunpowder tree (Trema orientale).


Representative Soil Features

Typical soils are deep to very deep basic volcanic ash deposited over `a`a lava or pahoehoe lava. Landscape surfaces in this ecological site are 11,000 to 300,000 years old. Soils are moderately well or well drained. Available water capacity ranges from x to x inches. Available water capacity refers to the volume of water available to plants in the upper 40 inches of soil, including rocks, at field capacity. Permeability is moderately rapid to rapid. Runoff potential ranges from low to moderate. Moist surface colors range from dark reddish brown to very dark brown. Soil reactions (pH in CaCl2) range from slightly to extremely acid in surface horizons and slightly to extremely acid in subsurface horizons. Soil temperature regimes are isothermic. Soil moisture regimes are udic (soil moisture control section is not dry in any part for as long as 90 cumulative days in normal years).




Predominant Parent Materials: basic volcanic ash
Kind: deposited over `a`a lava or pahoehoe lava
Origin:      

Surface Texture: (1) silt loam
Surface Texture: (2) silty clay loam
Subsurface Texture Group: 

Surface Fragments <=3" (%Cover): 0-10
Surface Fragments >3" (%Cover): 0-10

Rock Fragments <=3" (%Volume):0-10
Rock Fragments >3" (%Volume): 0-10

Drainage Class: moderately well to well

Permeability Class: moderately rapid to rapid




Minimum

Maximum

Depth (inches):

50

>60

Electrical Conductivity (mmhos/cm):

0

2

Sodium Adsorption Ratio:

0

0

Calcium Carbonate Equivalent (percent):

0

0

Soil Reaction (1:1 Water):







Soil Reaction (.0-1M CaC12):







Available Water Capacity (inches):









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