Dependent variable ( |
p-value | Standard error | R2 | Figure |
---|---|---|---|---|
Ash content | 0.0032 | 0.4825 | 0.1286 | |
Net calorific value of dry matter | <0.0001 | 0.1026 | 0.2120 | |
Net calorific value of moist fuel | <0.0001 | 0.6905 | 0.3940 | |
Bulk density | <0.0001 | 0.0733 | 0.7789 | |
Energy density | <0.0001 | 0.3962 | 0.7718 | |
Shrinkage of diameter | 0.0015 | 1.3550 | 0.0989 |
Species | Parameter | Estimation | p-value |
---|---|---|---|
Silver birch | 3.851 | <0.0001 | |
0.02156 | 0.0432 | ||
3.572·10−283 | <0.0001 | ||
−1.944·10−7 | 0.0175 | ||
R2 | 0.240 | ||
SE | 1. 098 | ||
p | 0.0010 | ||
Norway spruce | 0.15284 | <0.0001 | |
0.37387 | <0.0001 | ||
R2 | 0.937 | ||
SE | 0.990 | ||
p | <0.0001 |
Sample | p-value | Standard error | R2 | |||
---|---|---|---|---|---|---|
Birch, covered | 58.654 | −7.687 | 0.423 | 0.0235 | 8.289 | 0.415 |
Birch, uncovered | 78.481 | −11.882 | 0.863 | 0.0967 | 12.862 | 0.284 |
Spruce, covered | 57.448 | −9.080 | 0.561 | 0.0428 | 8.637 | 0.363 |
Spruce, uncovered | 65.693 | −10.981 | 0.722 | 0.0407 | 9.484 | 0.367 |
Storage time, year | Spruce, top | Spruce, middle | Birch, top | Birch, middle |
---|---|---|---|---|
0 | 100.0 | 100.0 | 100.0 | 100.0 |
1 | 95.9 | 95.8 | 90.5 | 90.4 |
2 | 92.0 | 91.7 | 81.9 | 81.7 |
3 | 88.2 | 87.9 | 74.2 | 73.9 |
4 | 84.6 | 84.2 | 67.1 | 66.8 |
5 | 81.2 | 80.6 | 60.8 | 60.4 |
6 | 77.9 | 77.2 | 55.0 | 54.5 |
7 | 74.7 | 73.9 | 49.8 | 49.3 |
8 | 71.6 | 70.8 | 45.1 | 44.6 |
Dependent variable ( |
Figure | Parameter | Estimation | p-value |
---|---|---|---|---|
Ash content, % | 1.561477 | <0.0001 | ||
0.000941 | <0.0001 | |||
0.315644 | 0.0230 | |||
−0.000310 | 0.0045 | |||
−0.000140 | 0.0341 | |||
−0.000122 | 0.0633 | |||
Net calorific value of dry matter, kWh/kg | 5.323000 | <0.0001 | ||
0.000085 | 0.0081 | |||
−0.000039 | 0.0052 | |||
0.000021 | 0.1380 | |||
Net calorific value of moist fuel, kWh/kg | 4.162196 | <0.0001 | ||
−0.001087 | <0.0001 | |||
−0.643537 | <0.0001 | |||
0.000423 | <0.0001 | |||
Bulk density, g/cm3 | 0.571200 | <0.0001 | ||
−0.000160 | <0.0001 | |||
0.173900 | <0.0001 | |||
−0.042530 | 0.0013 | |||
0.000046 | 0.0069 | |||
Energy density, MWh/m3 | 3.055000 | <0.0001 | ||
−0.000846 | <0.0001 | |||
0.925200 | <0.0001 | |||
−0.232900 | 0.0012 | |||
0.000248 | 0.0068 | |||
Shrinkage of diameter, % | 4.284253 | <0.0001 | ||
−0.791850 | 0.0012 | |||
0.000150 | 0.0973 |
No | Date of sampling | Days from the start of the experiment |
---|---|---|
1 | 16.06.2010 | 0 |
2 | 02.09.2010 | 78 |
3 | 22.11.2010 | 159 |
4 | 07.03.2011 | 264 |
5 | 02.09.2011 | 443 |
6 | 15.02.2012 | 609 |
7 | 25.04.2012 | 679 |
8 | 04.06.2012 | 719 |
9 | 24.08.2012 | 800 |
10 | 23.11.2012 | 891 |
11 | 16.05.2013 | 1065 |
12 | 26.11.2013 | 1259 |
13 | 25.06.2014 | 1470 |
14 | 12.12.2014 | 1640 |
15 | 26.08.2015 | 1897 |
16 | 28.08.2016 | 2265 |
17 | 18.03.2018 | 2832 |