differences in soil organic matter and soil texture in newly constructed experimental wetlands...
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Differences in soil organic matter and soil texture in
newly constructed experimental wetlands
Catherine BodnarSam Merrett
Becca Brooke
EDIC Wetland Project
1No
Planting
2Low
IntensityPlanting
3High
IntensityPlanting
4No
Planting
5Low
IntensityPlanting
6High
IntensityPlanting
The objective of the EDIC study is to determine which of three planting treatments best restores
function in constructed wetlands
Study Objectives:
Collect baseline data on SOM and texture to assess future effects of treatments
Determine how construction affected SOM and texture
The Importance of Texture and Soil Organic Matter
Soil Organic Matter
Water Holding Capacity Cation Exchange Capacity Soil Development Rates
Texture
Water holding capacity Nutrient content Soil Organic Matter
Both soil texture and soil organic matter are important to other soil properties and can be a good indicator of how an ecosystem is functioning
Methods: Sample Collection
6 wetland cells 225 Ft. X 115 Ft.
Data set #1: SOM = Green X’s
12 samples/cell 36 cores/cell
Texture = yellow circles 4 samples/cell 12 cores/cell
Data set #2: SOM = Black Oval
5 samples/cell 15 cores/cell
BA C D E F G1
2
4
5
6
7
8
3
Methods: Sample Analyses
• Texture• Removed 50 g from oven-dried
sample• Mixed in blender to separate soil
particles• Took hydrometer readings to estimate
percentages of sand, silt, and clay
• Soil Organic Matter• Hammered baked soil for further homogenization• Weighed soil and crucible• Incinerated at 400ºC• Used difference in weight of soil before and after incineration to estimate percent SOM
*statistical difference in silt and clay %, not in sand %
*East to West gradient
Percent Sandy = 0.6692x + 12.928
R2 = 0.2278
0
5
10
15
20
25
30
35
40
45
50
Wetland 1 Wetland 2 Wetland 3 Wetland 4 Wetland 5 Wetland 6
perc
ent of to
tal part
icle
s
Percent Silty = 1.7488x + 35.714
R2 = 0.7417
0
5
10
15
20
25
30
35
40
45
50
Wetland 1 Wetland 2 Wetland 3 Wetland 4 Wetland 5 Wetland 6
per
cent of to
tal p
articl
es
Percent Clay y = -2.418x + 51.358
R2 = 0.9693
0
5
10
15
20
25
30
35
40
45
50
Wetland 1 Wetland 2 Wetland 3 Wetland 4 Wetland 5 Wetland 6
per
cent of to
tal p
articl
es
SAND
SILTCLAY
*Statistical difference between cells
*East to west SOM gradient
***Average SOM per Cell *****
0
1
2
3
4
5
6
7
1 2 3 4 5 6
*Wetland **
% S
OM Data Set #1
Data Set #2
Linear (Data Set #1)
Linear (Data Set #2)
SOM and Texture Distribution
1 2 3 4 5 6
There IS a statistically significant difference forSOM, Silt and Clay between the western and
eastern groups, and NOT among group members
West Group East Group
Implications1 4
Researchers will have to consider:*There is statistical difference between some replicates
*Measured variables effect other soil properties
No Planting
2 5
Low Intensity Planting
3 6
High Intensity Planting
1 4
No Planting
2 5
Low Intensity Planting
3 6
High Intensity Planting
SOM and Silt
Clay??
Wetland Construction Didn’t Change Measured Variables
Soil Survey Data(texture)
Sabel et. al.(SOM)
MkA: Mahoning-Tiro silt loamTrA: Trumball
Special Thanks To:
•John Petersen
•Brad Masi
•Josh Smith