Download
1 / 75
750 likes | 916 Vues
ESRM410 Forest Soils & Site Productivity Soil Nutrients, Uptake, Productivity, BioGeoChemistry Rob Harrison. http://soilslab.cfr.washington.edu/esrm410/Soil&Nutrients.ppt.
E N D
ESRM410 Forest Soils & Site Productivity Soil Nutrients, Uptake, Productivity, BioGeoChemistry Rob Harrison
http://soilslab.cfr.washington.edu/esrm410/Soil&Nutrients.ppthttp://soilslab.cfr.washington.edu/esrm410/Soil&Nutrients.ppt Tree growth (height, diameter, mass, volume, C, etc.) Time
http://soilslab.cfr.washington.edu/esrm410/Soil&Nutrients.ppthttp://soilslab.cfr.washington.edu/esrm410/Soil&Nutrients.ppt Tree growth (height, diameter, mass, volume, C, etc.) Time
awesome good poor Tree growth Time
Site Index DNR site 150 1 3 100 50 5 Tree growth Time
For Western Washington, the 50 year site index is used SITECLASS SITE INDEX RANGE I 137+ II 119-136 III 97-118 IV 76-96 V 1-75 For Eastern Washington, the 100 year site index is used SITECLASS SITE INDEX RANGE I 120+ II 101-120 III 81-100 IV 61-80 V 1-60
Soil provides (or doesn’t): 1) physical support 2) air, CO2 to green, O2 to roots 3) water 4) temperature moderation 5) protection from toxins (buffering) 6) nutrient elements Often not included: Home for plant-beneficial organisms (mutualists)
A typical elemental content life of granitic soil development
Micronutrients Macronutrients Atmospheric Secondary C H O P K N S Mg Ca Fe B Mn Cu Zn Mo Cl Co Si F "see Hopkins mighty good Café by my Cousin Moe Clyde's Company. Silly Face.
Ideal for Field trip reports and what-ifs: 1) make a table to compare what you saw, compare and contrast different ecosystems, by place, age, treatment, etc. 2) speculate a bit, particulary in what might happen in the future in stands you saw, and try and support your speculation with data you found from somewhere else. 3) Is a change noted in a system due to a treatment inherently bad for productivity?
http://soilslab.cfr.washington.edu/ESRM410/WhatIf3/ What If? Scenario 3. Imagine you are working with a "gene splicer" that can introduce different types of N-fixers into your favorite tree species, Douglas-fir. There are two levels of N fixation available, a high level "A" and half that "B". Also, it is possible to have the Douglas-fir "shut down" N fixation after enough N builds up that it is no longer limiting the growth of the Douglas-fir, or to continue to have it fix N indefinitely, yielding scenarios of A1, A2, B1 and B2 (Fig. 1).
Consider that all four scenarios cost the same amount of money to introduce into the DF. Diagram the impact on the following soil properties of each scenario: • 1) pH, • 2) total C, • 3) total N, • 4) available N, • 5) NO3- leaching, • 6) available P, • 7) CEC, • 8) AEC and • 9) mineral dissolution.
Produce 9 separate graphs quickly. Next, interpret the potential impacts of each of these on soil productivity and the quality of water (for drinking) leaching through the soil profile. Consider as many soil and other additional variables as you feel appropriate.
http://soilslab.cfr.washington.edu/ESRM410/WhatIf3/ Potentially helpful papers VanMiegroet&Cole-1984.pdf Harrison-etal-1994.pdf Harrison-etal-2005.pdf Strahm&Harrison-2006.pdf Strahm-etal-2005.pdf
Primary Succession on Land
