Table 2.
Comparison of 55 phenophases for springtime months in response to climate warming
| Month | No. of phenophases | Avg regression slope, day/year | Increasing in earliness
|
Not
increasing in
earliness
|
||
|---|---|---|---|---|---|---|
| No. | % | No. | % | |||
| February | 1 | −0.365 | 1 | 100 | — | |
| March | 8 | −0.169 | 4 | 50 | 2 | 25 |
| April | 13 | −0.091 | 4 | 31 | 4 | 31 |
| May | 19 | −0.074 | 6 | 31 | 5 | 27 |
| June | 14 | −0.060 | 4 | 28 | 9 | 64 |
| Mean = −0.12 | ||||||
Those increasing in earliness had >95% probability of significance (P < 0.05). Those not increasing in earliness had t values between +1 and −1.