fire+beetle kill

7/31/2019 Fire+Beetle Kill

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Characteristics of Mazama AshSoils

S o il C ha racter is t ics o f M az am a Ash S oi ls in the R e

U p p e r C h e w a u c a n W a te rs h e d , 2 0 0 8

44.8

1.9

8 .56.21

9 .2

0

10

20

30

40

50

S oil D epth D uff D epth Rhiz om e D epth M ois ture (% ) S oil Tem p C

depths(cm)


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The scenario occurring duringthe destruction of soil structure

by fire is: Soil structure collapses

Reduces soil porosity

Soil surface compacted by raindrops

Soil pores become partially or totallysealed

Impenetrable soil surface reducesinfiltration rates, producing rapidrunoff and hill slope erosion


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Stand Density

Predominantly Lodgepole Pine

Western Mountain Pine Beetles Effect

Basal area reduced from 300 to around100

Living trees reduced from 400 to 120,leaving around 280 standing snags per

acre


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Soil Heating Process


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Research Procedure


7/12

Water Holding CapacityResults

C o m p a r is o n o f W a te r H o ld in g C a p a c i ty o f M a

B u r n e d fo r 5 m in u te s a t V a r io u s T e m p e

5 7 . 6 5 8 . 05 1 . 3

4 6 . 0

0 . 0 0

1 0 . 0 0

2 0 . 0 0

3 0 . 0 0

4 0 . 0 0

5 0 . 0 0

6 0 . 0 0

7 0 . 0 0

2 0 C Te s t in g 1 0 0 C Te s t in g 2 0 0 C Te s t in g 4 0 0 C Te s t in g

waterholdingcapacity(%)


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Percolation Rate Results

C o m p a r is o n o f P e rc o la t io n R a te s in M a z a m a A

fo r 5 m in u te s a t In c r e a s in g T e m p e r a tu

0 . 7 0 .7

3 . 0

3 .6

0 . 0 0

0 . 5 0

1 . 0 0

1 . 5 0

2 . 0 0

2 . 5 0

3 . 0 0

3 . 5 0

4 . 0 0

2 0 C Te s t in g 1 0 0 C Te s t in g 2 0 0 C Te s t in g 4 0 0 C Te s t in g

percolationratio(g/s)


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Turbidity Results

100 CTurbidity: 200

Cloudy

200 CTurbidity: 50

Colored

400 CTurbidity: 10

Clear

Samples added to 500ml of water, agitated for 5minutes and sat for 1 minute before photographs

were taken.


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Bacteria Results

C om par ison o f B ac ter ia l C oun ts a t Va rious D epths

Ash S oi ls Fo llow ing B urn ing for 5 minutes a t V

Tem pera tu res , 2008

2400

8 0 0

2400 2400

18001600

2400 2400 2400 2400

0

500010000

15000

20000

25000

30000

20 C 100 C 200 C 400 C

meanba

cterialcount

Surfac

2 .5cm

5c m


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Effects of Heat on SoilStructure

20 C

600 C200 C

100 C

800 C


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Conclusion

Soil can be significantly changes attemperatures of 200 C

Hydrocarbons in pine needles bind soil

particles together, increasing plasticityof soils.

Increased erosion, decreased nutrients andwater storage

Water repellent layers become amajor soil feature at 400 C

Soil Biota is killed within the first inch

fire+beetle kill

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