ESRM 410 Forest Soils and Site Productivity 2011
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ESRM 410 Forest Soils and Site Productivity
2011
Nutrient Limitation‘What if Scenario’
Cedar River Watershed – plots just located upstream of ‘you are here’ pointer
• This slide and some following contain the design, stand characteristics and initial growth results. Please concentrate on explaining factors that might have led to the differential growth of Douglas-fir vs. red alder on each site and also the differential growth of each species on different initial site (i.e. RA-RA vs. DF-RA – Group 1 orally presents Friday and RA-DF vs. DF-DF – Group 2 orally presents Friday).
Figure 1. Layout of study.
Alder replanted with Alder
DF replanted with DF
Alder replanted with DF
DF replanted with Alder
Table 1.
Table 2. Stand C distribution in the 50-yr-old Douglas fir and red alder stands. Tree and understory C concentrations were assumed to be 500 mg C kg-1. Where possible from sampling procedure, variability between plots was assessed and means compared via two-tailed two-sample t-test (Freund, 1988).
Component Douglas fir Red alder ------------------- kg C ha-1 -------------------- Total tree 158000 136000 Aboveground 136000 113000 Leaf 3100 1750
Understory 1550 (500)† * 3000 (1050)*
O horizon 9470 (235)*** 30300 (640)***
Wood 6020 (1130)** 9300 (1250)** Mineral soil 0-15 cm 37700 50200 15-30 cm 21900 32700 30-45 cm 20100 21600
Total soil 79700 105000 Total stand 255000 284000
*,**,*** Significant at the 0.05, 0.01 and 0.001 probability levels, respectively.
† Numbers in parentheses are standard deviations (n=4).
Figure 2. Growth of new plantations.
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