Contribution of organic matter to suspended sediment and turbidity in streams with differing forest cover

Graduation Date

2015

Document Type

Thesis

Program

Other

Program

Thesis (M.S.)--Humboldt State University, Natural Resources: Forest, Watershed, & Wildland Sciences, 2015

Committee Chair Name

Kristine Brenneman

Committee Chair Affiliation

HSU Faculty or Staff

Keywords

Forest cover, Organic matter, Humboldt State University -- Theses -- Natural Resources, Suspended sediment, Turbidity

Abstract

In this study, I quantified particulate organic matter and total suspended sediment (TSS) discharged during four storms from six tributaries of the Mattole River in northern California during the 2012 hydrological year. The six catchments ranged in size from 1.42 to 5.41 km2. The percentage of forest cover ranged from 30 to 97%. Sampling was conducted to evaluate hypotheses that more organic matter is discharged from catchments with more forested area, the percentage of organic matter discharged is greater with more forest cover, and the percentage of organic matter is negatively related with turbidity. Coarse particulate organic matter in the streams comprised less than 1% of the organic matter discharged. Fine particulate organic matter (FPOM) in suspension did not differ significantly between more forested and less forested catchments (p=1, n1=3, n2=3, W=10). The percentage of organic matter discharged is not greater with more forest cover because R2 values of the relationship between the percentage of organic matter and TSS ranged from 0.082 to 0.371. Also, I cannot conclude that FPOM is negatively related with turbidity because the R2 values ranged from 0.081 to 0.262. Low sample sizes and high variability in organic matter contributed to the rejection of my hypotheses.

https://scholarworks.calstate.edu/concern/theses/z603r0733

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