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Above-canopy precipitation (Pg) was measured at OPEN1 and OPEN2 and at two other clearings with a standard rain gauge (Figure 1) while TF was the average catch of 10 randomly sited rain gauges in each forest site (Buttle & Farnsworth 2012). Ten MH trees at MH1 and four RP trees at both YP1 and OP3 (Table 2) were used to estimate SF as described by Buttle et al. (2014). All SF infiltrated the soil within ∼0.2 m of the bole (Buttle et al. 2014); thus, SF volume was divided by the area of a 0.2 m wide ring around each bole to obtain SF depth (mm). Measurements of TF and SF were not made during winter due to the inability to regularly access some sites, and SF was assumed to be negligible.

Table 2

Characteristics of trees used to measure stemflow (SF)

MH1
YP1
OP3
SpeciesDBH (m)PCA (m2)SpeciesDBH (m)PCA (m2)DBH (m)PCA (m2)DBH (m)PCA (m2)
O 0.45 101.2 SM 0.35 60.6 0.14 3.0 0.25 18.3 
O 0.12 16.5 SM 0.09 8.2 0.13 2.8 0.29 20.3 
WA 0.25 47.0 0.12 6.8 0.08 3.2 0.36 22.2 
WA 0.32 52.6 0.15 14.6 0.20 7.2 0.43 39.2 
SM 0.48 163.9 0.11 10.3     
SM 0.22 40.7 0.14 42.8     
MH1
YP1
OP3
SpeciesDBH (m)PCA (m2)SpeciesDBH (m)PCA (m2)DBH (m)PCA (m2)DBH (m)PCA (m2)
O 0.45 101.2 SM 0.35 60.6 0.14 3.0 0.25 18.3 
O 0.12 16.5 SM 0.09 8.2 0.13 2.8 0.29 20.3 
WA 0.25 47.0 0.12 6.8 0.08 3.2 0.36 22.2 
WA 0.32 52.6 0.15 14.6 0.20 7.2 0.43 39.2 
SM 0.48 163.9 0.11 10.3     
SM 0.22 40.7 0.14 42.8     

O is white oak, WA is white ash, SM is sugar maple and B is American beech. All trees sampled at YP1 and OP3 were red pines.

DBH, diameter at breast height; PCA, projected canopy area.

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