Stepwise linear regression for the explanatory variable BBCH 65 (full flowering: > 50% of flowers open/emitting pollen, first petals falling) for silver birch (Betula pendula Roth),
common hazel (Corylus avellana L.) and horse chestnut (Aesculus hippocastanum L.) in solely urban sites of Munich in 2010. Significant predictors: T ¼air temperature (common
hazel: mean of January and February; silver birch and horse chestnut: mean of March and April), O3: long-term exposure of ozone, PM10: long-term exposure of particulate
matter < 10 mm, significance levels: ***p 0.001, **p 0.01, *p 0.05, R2 ¼ goodness of fit.
Stepwise linear regression for the explanatory variable BBCH 65 (full flowering: > 50% of flowers open/emitting pollen, first petals falling) for silver birch (Betula pendula Roth),common hazel (Corylus avellana L.) and horse chestnut (Aesculus hippocastanum L.) in solely urban sites of Munich in 2010. Significant predictors: T ¼air temperature (commonhazel: mean of January and February; silver birch and horse chestnut: mean of March and April), O3: long-term exposure of ozone, PM10: long-term exposure of particulatematter < 10 mm, significance levels: ***p 0.001, **p 0.01, *p 0.05, R2 ¼ goodness of fit.
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