324Lab3 2011 - ESR 324 Environmental Systems II Lab 3...

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ESR 324 Environmental Systems II Lab 3 Winter 2011 Nutrient Distribution in a Forested Watershed Where: TBA, Portland State University, and field sites in the West Hills TA - Tues: Matthew Duveneck ( mduveneck@gmail.com ; office TBA) TA – Thurs: Sarah S. Holman ( sarahshewell@gmail.com ; office TBA) Instructor: Alan Yeakley ( yeakley@pdx.edu ; office Wed 11-12) Note: Some methods in this lab use hazardous chemicals . Become aware of the location of the nearest first aid equipment and safety shower to the lab work area before conducting the lab. You are required to wear eye protection while conducting the wet chemistry portion of the lab, and are recommended to wear rubber/plastic gloves while handling chemicals. No food or beverages are allowed in the lab area . Note: As with other labs in the course, Fieldbooks will be collected at the end of each laboratory , including both field and chemistry lab sessions a nd evaluated. The data from all students will be collected and collated and redistributed via email. The fieldbooks will be returned to you the following week. Every student is responsible for filling out a fieldbook for all the data collected from his/her group; groups should work to insure that all data are consistent from each group. Introduction Having completed analyses of the topographic, vegetation and soil characteristics of the same watershed in Forest Park in previous labs, we will now estimate concentration of phosphorus (P), an important nutrient, in each of four forest ecosystem compartments: canopy (live foliage); litter (dead foliage on the forest floor); upper soil layers; and streamwater. We hypothesize that (1) P concentrations will vary among these four ecosystem components and (2) that there will be a difference between cove and ridge sites in terms of P concentrations in the soil, foliage and litter. Such a simple 4 compartment depiction of a forest ecosystem ignores many factors, such as nutrient concentrations in woody biomass (stems, branches, twigs), in the shrub and herbaceous layers, and in deeper soil layers. This approach also ignores seasonal variation; for example, we will not obtain values for deciduous canopy at this time of year. Further, we are only getting a rough approximation of spatial variability and are not measuring phosphorus input in the precipitation or from mineral weathering. Regardless, sampling from the four compartments described above will give us a snapshot of primary compartments for this important nutrient, and will also give us a very preliminary view how phosphorus is distributed in the forest ecosystem.
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Methods During the first three sessions of this lab, we will collect and prepare samples for analysis for the following ecosystem compartments: Foliage – conifer trees Litter – conifer and deciduous trees Soil – organic horizon soil and mineral horizon soil Stream water Biomass samples will be categorized by tree species, and biomass and soil samples will further be categorized by location (cove vs. ridge). There must be a minimum of two replicates in any category to conduct statistical testing.
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This note was uploaded on 01/12/2012 for the course ENVIRONMET 321 taught by Professor Dr.j.alanyeakley during the Winter '11 term at Portland State.

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324Lab3 2011 - ESR 324 Environmental Systems II Lab 3...

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