132
J . ROGER BRAY AND EVILLE GORRAM
TABLE XVI
Litter Production and Tree Density
Species
Authority
Density
Litter
(treeslha),
(metric tons/
h a m )
Fagw silvatica
Moller, 1945
179
2.8
233
2.3
244
2.3
248
2.6
281
2.7
317
2.5
901
2.9
908
2.8
1173
2.6
5 842
2.2
6 732
3.0
Populus trernula
Sviridova, 1960
988
5.0
1464
4.2
1688
5.4
2 460
4.9
1161
3.4
1 947
2.7
2 402
3.3
Pinus ponderosa
Biswell and Schultz (P.c.)
1196
2.6
1495
2.0
2 931
1.8
3 459
2.1
Pinus paluatris
Heyward and Barnette, 1936
889
2.7
parison of eleven stands of Fugw silvatica (Moller, 1945) by a rank correlation test showed no significant correlation ( p > 0.10) between litterfall and tree density. Similarly, studies by Sviridova (1960), Heyward
and Barnette (1936) and Biswell and Schultz (Schultz, private communication) failed to show any consistent relationship between these
two variables, although in each of these instances only four stands were
compared.
I n Norway Bonnevie-Svendsen and Gjems (1957) have shown a
distinct correlation between annual fall of leaf litter and stand basal
area in a series of Gymnosperm and Angiosperm stands. Litter-fall
averaged about 70-75 kg per m2 basal area, over a basal area range from
8 to 40 m2/ha. In Missouri (U.S.A.), Crosby (1961) has demonstrated a
correlation between total litter-fall of Pinus echinata and stand basal
area, but in this case an increase from minimum to maximum basal area
coverage of three-fold only doubled the annual litter-fall. The stands of
low basal area had been thinned a few years prior to litter collection, and
presumably the less productive trees were removed.
J . ROGER BRAY AND EVILLE GORRAM
TABLE XVI
Litter Production and Tree Density
Species
Authority
Density
Litter
(treeslha),
(metric tons/
h a m )
Fagw silvatica
Moller, 1945
179
2.8
233
2.3
244
2.3
248
2.6
281
2.7
317
2.5
901
2.9
908
2.8
1173
2.6
5 842
2.2
6 732
3.0
Populus trernula
Sviridova, 1960
988
5.0
1464
4.2
1688
5.4
2 460
4.9
1161
3.4
1 947
2.7
2 402
3.3
Pinus ponderosa
Biswell and Schultz (P.c.)
1196
2.6
1495
2.0
2 931
1.8
3 459
2.1
Pinus paluatris
Heyward and Barnette, 1936
889
2.7
parison of eleven stands of Fugw silvatica (Moller, 1945) by a rank correlation test showed no significant correlation ( p > 0.10) between litterfall and tree density. Similarly, studies by Sviridova (1960), Heyward
and Barnette (1936) and Biswell and Schultz (Schultz, private communication) failed to show any consistent relationship between these
two variables, although in each of these instances only four stands were
compared.
I n Norway Bonnevie-Svendsen and Gjems (1957) have shown a
distinct correlation between annual fall of leaf litter and stand basal
area in a series of Gymnosperm and Angiosperm stands. Litter-fall
averaged about 70-75 kg per m2 basal area, over a basal area range from
8 to 40 m2/ha. In Missouri (U.S.A.), Crosby (1961) has demonstrated a
correlation between total litter-fall of Pinus echinata and stand basal
area, but in this case an increase from minimum to maximum basal area
coverage of three-fold only doubled the annual litter-fall. The stands of
low basal area had been thinned a few years prior to litter collection, and
presumably the less productive trees were removed.