soil chemistry large pictures

7/31/2019 Soil Chemistry Large Pictures

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Aspen Stands and Implications ofConifer Removal - Nitrogen

The increase in nitrites is likely due to the conversion ofammonia to nitrites in the process of becoming nitrates.

Other differences are statistically insignificant

Based on 16 comparative samples

Soil Nitrogen Chem istry in Aspen Stands

0.10

1.49

0.70

1.29

0.36

0.86

0.550.63

0.110.00

0.20

0.40

0.60

0.80

1.001.20

1.40

1.60

1.80

2.00

NH4-N NO3-N NO2-N

Concentration(ppm,

mg/L)

Conifer removedOutside Stand

Mixed aspen / conifer


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Aspen Stands and Implications of ConiferRemoval Other Soil Chemistry

Soil Chemistry in Aspen Stands

0.02 0.11 0.04

4.70

2.70

3.53

0.00

1.00

2.00

3.00

4.00

5.00

6.00

PO4 K

Concentration

(ppm,

mg/L)

Conifer removed

Outside Stand

Mixed aspen / conifer

Ammonia appears to increase significantly during first year inaspen stands when conifers are removed

Potassium increases are barely significant (a = 0.05)

Other differences are statistically insignificant Based on 16 comparative samples


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The Effect of Slashbusting and SubsequentBurning Other Soil Chemistry

Comparision of Soil Chemistry in Slash Bust Treatments

0.58

14.4

1.77

10.4

0.75

7.8

0

2

4

6

810

12

14

16

18

20

PO4 K

Concentration

(ppm,

mg/L)

Non Slash Bust

Slash Bust

SB Burn

Burning appears to increase ammonia significantly

Burning appears to decrease potassium, though it is barelysignificant (a = 0.043)

Control and slashbusted sites are not statistically different Based on 30 comparative samples


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Soil Chemistry following Wildfireand Harvest - Nitrogen

Comparison of Soil Chemistry by Treatment

(harvest vs non-harvest)post Toolbox Complex Wildfire

0.03

0.13

0.4

0.06

0.22

0.47

0

0.1

0.2

0.3

0.4

0.5

0.6

NH4-N NO3-N NO2-N

Concentration

(ppm)

Harvest

Non Harvest

ANOVA tests indicate that there were no statistically significantdifferences between harvested and non-harvested wildfire sitesin the Toolbox Complex.

The most significant was nitrate (a = 0.055)

Results based on 27 comparable samples On average 24 trees per acre were harvested


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Soil Chemistry following Wildfire andHarvest Other Soil Chemistry

Comparison of Soil Chemistry by Treatment(harvest vs non-harvest)

post Toolbox Complex Wildfire

5.13

7.176.3

7.61

0

1

2

3

4

5

6

7

8

9

10

PO4 K

Concentration(ppm)

Harvest

Non Harvest

ANOVA tests indicate that there were no statistically significantdifferences between harvested and non-harvested wildfire sitesin the Toolbox Complex. Results based on 27 comparable samples

On average 24 trees per acre were harvested


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Comparison of Juniper Treatments onSoil Chemistry - Nitrogen

Nitrates increase significantly compared to all othertreatments when juniper is burned.

All other values are statistically insignificant. Based on 73 comparative samples

Comparison of Soil Nitroten Chemistry in JuniperTreatments

1.11

1.77

0.25

0.97

0.49

0.23

0.94

0.29 0.29

0.82

0.34

0.07

0.0

0.5

1.0

1.5

2.0

2.5

NH4-N NO3-N NO2-N

Concentration(pp

m,

mg/L)

Burn

CutLive

Open


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Comparison of Juniper Treatments on SoilChemistry Other Soil Chemistry

Comparison of Soil Chemistry by Juniper Treatment Options

1.64

6.99

0.60

6.72

1.87

6.12

1.79

6.23

0.0

1.0

2.0

3.0

4.0

5.06.0

7.0

8.0

9.0

PO4 K

Concentration(ppm,mg/L)

Burn

Cut

Live

Open

Phosphates decrease significantly when juniper is cut.

All other values are statistically insignificant. Based on 73 comparative samples


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Role of Woody Debris - Nitrogen

Comparisons of Nitrogen Concentrations in Dense Forests

0 0.00

0.700.75

0.07

0.40 0.420.380.35

0

0.2

0.4

0.6

0.8

1

1.2

NH4-N NO3-N NO2-N

Concentration(ppm,

mg/L)

Under Duff

Exposed

Under DWD

The small number of comparative samples rends all datastatistically insignificantly

It does appear that there may be a strong correlation betweenthatched duff / litter and nutrient cycling.

It does not appear that downed woody debris plays much of a

role until it is in later stages of decomposition. Results are based on 9 comparative samples


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Woody Debris - Other Soil Chemistry

Comparisons of Nitrogen Concentrations in Dense Forests

0.14

2.53

0

1.15

0

1.45

0

0.5

1

1.5

2

2.5

3

3.5

PO4 K

Concentration(ppm,

mg/L)

Under Duff

Exposed

Under DWD

The small number of comparative samples rends all datastatistically insignificantly

It does appear that there may be a strong correlation betweenthatched duff / litter and nutrient cycling.

It does not appear that downed woody debris plays much of a

role until it is in later stages of decomposition. Results are based on 9 comparative samples

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