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Total Pg for July 1, 2009–June 30, 2010 (1,199–1,335 mm, Table 3) was well above the 840 mm annual average at Peterborough Airport (Environment Canada 2011) ∼30 km to the northeast. Total snowfall for the 2009–2010 winter was 82 cm at Tapley, approximately half the normal depth. Mean TF as a fraction of Pg was similar between forest sites (0.8–0.87); however, MH TF:Pg ratios increased when TF focusing near the bole was considered. MH TF:Pg ratios increased between the growing season and winter–spring; conversely, TF:Pg for YP and OP generally decreased between these periods, reflecting greater snow interception efficiency. MH stands generated more SF than either YP or OP, whether SF was expressed relative to stand area or the 0.2 m wide focusing zone adjacent to the bole. Both TF focused within 0.5 m of the bole and SF focused within 0.2 m of the bole exceeded Pg for MH stands.

Table 3

Summary of above-canopy precipitation (Pg), throughfall (TF), interception (I) and stemflow (SF) for the study period, growing season and winter–spring

SitePga(mm)Total TFa(mm)Total TF:PgGrowing season Pg or TFb(mm)Growing season TF:PgWinter–spring TFc (mm)Winter–spring TF:PgTFF (mm)TFF:PgWeighted TF (mm)Weighted TF:PgI (mm)I:PgSFd (mm)Stand-scale SF:PgSF weighted by 0.2 m focusing zone (mm)Focusing zone SF:Pg
OPEN1 1,239   745  287            
OPEN2 1,205   705  285            
MH1 1,205 944 0.78 516 0.73 260 0.91 1,997 1.66 1,009 0.84 245 0.20 16 0.013 1,657 1.38 
MH2 1,205 998 0.83 554 0.79 264 0.93 2,091 1.74 1,051 0.87 186 0.15 21 0.017 1,657 1.38 
MH3 1,335 1,090 0.82 659 0.83 254 0.86 2,167 1.62 1,197 0.90 229 0.17 16 0.012 1,657 1.24 
YP1 1,239 1,074 0.87 644 0.86 249 0.87     161 0.13 0.003 140 0.11 
YP2 1,239 1,023 0.83 625 0.84 227 0.79     212 0.17 0.003 140 0.11 
YP3 1,239 1,074 0.87 671 0.90 227 0.79     159 0.13 0.005 140 0.11 
OP1 1,199 1,004 0.84 607 0.90 215 0.85     194 0.16 0.001 101 0.08 
OP3 1,335 1,074 0.80 666 0.84 220 0.75     260 0.19 0.001 101 0.08 
SitePga(mm)Total TFa(mm)Total TF:PgGrowing season Pg or TFb(mm)Growing season TF:PgWinter–spring TFc (mm)Winter–spring TF:PgTFF (mm)TFF:PgWeighted TF (mm)Weighted TF:PgI (mm)I:PgSFd (mm)Stand-scale SF:PgSF weighted by 0.2 m focusing zone (mm)Focusing zone SF:Pg
OPEN1 1,239   745  287            
OPEN2 1,205   705  285            
MH1 1,205 944 0.78 516 0.73 260 0.91 1,997 1.66 1,009 0.84 245 0.20 16 0.013 1,657 1.38 
MH2 1,205 998 0.83 554 0.79 264 0.93 2,091 1.74 1,051 0.87 186 0.15 21 0.017 1,657 1.38 
MH3 1,335 1,090 0.82 659 0.83 254 0.86 2,167 1.62 1,197 0.90 229 0.17 16 0.012 1,657 1.24 
YP1 1,239 1,074 0.87 644 0.86 249 0.87     161 0.13 0.003 140 0.11 
YP2 1,239 1,023 0.83 625 0.84 227 0.79     212 0.17 0.003 140 0.11 
YP3 1,239 1,074 0.87 671 0.90 227 0.79     159 0.13 0.005 140 0.11 
OP1 1,199 1,004 0.84 607 0.90 215 0.85     194 0.16 0.001 101 0.08 
OP3 1,335 1,074 0.80 666 0.84 220 0.75     260 0.19 0.001 101 0.08 

TFF is focused TF within 0.5 m of MH tree boles and weighted TF is the weighted mean of MH TF from within and outside the TF focusing zone, using representative areas as weighting factors.

aTotal inputs from both rain and snow for the study period.

bSum of rainfall inputs only for periods June 23, 2009–October 1, 2009 and May 5, 2010–July 12, 2010.

cSum of rainfall and snowfall inputs for period December 5, 2009–May 4, 2010.

dScaled-up from monitored trees using stand basal areas (Table 1). See text for details.

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