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Table V
Linear regression analysis of litter C:N and lignin:N ratios against years.
| Litter components | Regression | R 2 | DI |
|---|---|---|---|
| Total litterfall | C:N = 0.19 Year – 333 | 0.54 | |
| Lignin:N = 0.16 Year – 291 | 0.50 | ||
| Excluding ash leaves | C:N = 0.29 Year – 539 | 0.64 | 0.10 |
| Lignin:N = 0.22 Year – 419 | 0.63 | 0.06 | |
| Excluding bass leaves | C:N = 0.23 Year – 403 | 0.55 | 0.04 |
| Lignin:N = 0.20 Year – 371 | 0.58 | 0.04 | |
| Excluding maple leaves | C:N = 0.21 Year – 364 | 0.39 | 0.02 |
| Lignin:N = 0.19 Year – 356 | 0.53 | 0.03 | |
| Excluding oak leaves | C:N = 0.18 Year – 309 | 0.43 | –0.01 |
| Lignin:N = 0.18 Year – 332 | 0.50 | 0.02 | |
| Excluding subdominant species leaves | C:N = 0.17 Year – 300 | 0.56 | –0.02 |
| Lignin:N = 0.18 Year – 333 | 0.53 | 0.02 | |
| Excluding needles | C:N = -0.02 Year – 77 | 0.02 | –0.21 |
| Lignin:N = 0.04 Year – 59 | 0.069 | –0.12 | |
| Excluding twigs | C:N = 0.08 Year – 112 | 0.20 | –0.11 |
| Lignin:N = 0.10Year – 187 | 0.37 | –0.06 |
* DI is the differences between St and Sti (i = 1, 2, …, 7). St stands for the slope of linear regression model calculated from all litter components and Sti is the slope calculated after a certain litter component was excluded.