Hw #2 Plcase complete the following problems (engineering paper is recommended,

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Hw #2 Plcase complete the following problems (engineering paper is recommended, although not reguired) ESM 321 1 can't easily truce your steps, I won't he able to with comment, desarthong your process. Date due: Tues, Feb 27, 2018 in class. No submissions by email. (60 pts available) Concepts to consider Residencc time standing stock/ Molar masscs of Pvs. PO. are different into or out of pood . Average s (Total inpts+ Total New growth-Bux into pool of live * werv% deposition Caloule volume of rain given rainfall Mg- 10 depth and arca of Ouestions 1-3 relaic so one ccosysem, and questions 4-5 relanc to another onc. You may find it helpfial to start out by drawing a bos model that shows inputs, outputs, and storage in watershed each systcm, to help you conceptualize cach sysicm ints) Below you are given the avcrase moothly streandlow from the Saltrmann Crock watershod in Forest Park If phosehude foand to avenge 0.16s m@L throughout the year, estimate (a) the total volume of water (in L) and (b) the total mass of PO (in kg of PO) leaving the watcrshed i an averapc year please 2.486 Jun Jul Jan Feb Mar 2.349 2.014 0.333 0,199 0.191 2. (1O points) Suppose that precipitation for an average year in the Saltzmann Creck watcrshed in Forest Park was 42 aveage Pconcentration in minfall was 6.2x10 mg P/L. Further, 1.64x10 kg P ha hr. Suppose that in an average year it rains for a total of 1060 hours. Assume the is 2.60x10 ha What is the total mass of atmospheric P input to the watershed in a year? suppose that an average of dry fall P deposition ratc was found to be drainage arca of the watershed 3. (10 points) (a) If rock weathering represents 85% of P inputs and atmospheric P represents 15% of total the watershed annually from rock weathering? (b) Based on your computations in problems I and 2 the watershed on an annual basis. (c) State what percentage of total P inputs are retained (you can assume that PO inputs,how much Petters in problems 1 and 2, compule the net flux of P to/from is the dominant form of P being exported in stream water) in the watershed (15 points) The values in the table were found in a mature forest in central Oregon (Sollins et al. lys . Ec ·Min g 9.261 as. 50:261-285) ssume these values are representative of conditions at the Saltmann Creck watershed. What is the total mass of P in (a) the top eter of soil, (b) live biomass, (c) dead biomass, and (d) the entire watershed? Ecosystem Component Mass (Mpha) P 1.39 x 10 7.05 x 10 1.53 x 10 1.86 0.20 0,008 0,01 0.16 Foliage live wood Roots Conifer leaf litter

Explanation / Answer

4. Total mass of P in top 1m of soil: 1.5*104 * 0.0057/100 = 0.855 Mg/ha

Total mass of P in live biomass (foliage+aboveground live root+roots): (1.39*10) + (7.05*102)+(1.53*102) * (0.2+0.008+0.01)/100 = 1.9 Mg/ha

Total mass of P in dead biomass (conifer+broadleaf+wood litter) = (1.26+0.48+1.12) * 0.293/100 = 0.01 Mg/ha

Total mass of P in entire watershed: 15875.36 * 0.51/100 = 82.027 Mg/ha

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