PE EIE[R-Rg RESEARCH ON - HJ Andrews Experimental Forest

Table 2 .-Annual litter fall in Colorado stands of Pinus contorta .
Values are given as loss on ignition weights .
Year
Stand
2 .2 4 .1 1 .1 1.3 4 .3 LH2 Mean
T otal
Number
of samples
1967 0 .46 0 .47 17 1
1968 0.37 0 .47 .36 0 .63 0 .30 0 .38 .40 5 2
1969 .41 .56 .50 .88 .52 .69 .59 5 2
1970 .25 .39 .37 .45 .30 .54 .37 52
Mean .34 .47 .42 .65 .37 .52 .46
1 A fire in our drying oven caused the loss of many samples . Only the samples from stand 1 .1 entirel y
escaped the fire and can be used for comparison with other years.
Table 3 .-Constituents of the 1967-68 annual litter fall, as los s
on ignition in Pinus contorta stands in Colorado
Stand
Numbe r
of samples
Needles Branches 9 Cones d Cones Bark
% kg/m 2 % kg/m 2 % kg/m 2 % kg/m 2 % kg/m 2
2 .2 7 66 0 .24(18) 1 18 0.07(65) 12 0.05(59) 1 0 .00(58) 2 3 0 .01(20 )
4 .1 7 64 .30(10) 13 .06(105) 18 .08(98) 1 .00(90) 5 .02(28 )
1 .1 7 68 .24(11) 10 .04(29) 15 .05(52) 1 .00(45) 6 .02(36 )
1 .3 8 54 .34(28) 6 .04(60) 34 .21(103) 2 .01(44) 5 .03(59 )
4 .3 15 83 .25(17) 2 .01(105) 9 .03(72) 3 .01(35) 2 .01(70 )
LH2 8 72 .26(14) 10 .04(55) 10 .04(94) 4 .02(21) 4 .01(56 )
Mean 52 68 .27 10 .04 16 .07 2 .01 4 .0 2
1
Coefficient of variation in parentheses .
2 Trace quantities are less than 0 .005 kg/m2 . Rounding errors may cause the percentages for each stand to
total around 100 . Only trace quantities of nonpine debris are found in each stand .
192