Differences in soil organic matter and soil texture in newly constructed experimental wetlands Catherine Bodnar Sam Merrett Becca Brooke.

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Presentation transcript:

Differences in soil organic matter and soil texture in newly constructed experimental wetlands Catherine Bodnar Sam Merrett Becca Brooke

EDIC Wetland Project 1 No Planting 2 Low Intensity Planting 3 High Intensity Planting 4 No Planting 5 Low Intensity Planting 6 High Intensity Planting 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 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 B C D E F G 1 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 2 3 4 5 6 7 8

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

Soil Texture Results SAND *statistical difference in silt and clay %, not in sand % *East to West gradient CLAY SILT

SOM Results *Statistical difference between cells *East to west SOM gradient

SOM and Texture Distribution 1 2 3 4 5 6 East Group West Group There IS a statistically significant difference for SOM, Silt and Clay between the western and eastern groups, and NOT among group members

Implications SOM and Silt Clay?? Researchers will have to consider: 1 4 2 5 3 6 SOM and Silt No Planting Low Intensity Planting High Intensity Planting Clay?? 1 4 2 5 3 6 No Planting Low Intensity Planting High Intensity Planting Researchers will have to consider: *There is statistical difference between some replicates *Measured variables effect other soil properties

Wetland Construction Didn’t Change Measured Variables Sabel et. al. (SOM) Soil Survey Data (texture) MkA: Mahoning-Tiro silt loam TrA: Trumball

Special Thanks To: John Petersen Brad Masi Josh Smith