Take the 2-minute tour ×
Biology Stack Exchange is a question and answer site for biology researchers, academics, and students. It's 100% free, no registration required.

The past winter (2011-2012) was warmer than usual.

Trees are normally tapped in late February when the daily maximum temperature goes above freezing. However, assuming that there have been relatively few days with a maximum temperature below freezing, how would this affect the timing and quantity of sap flow?

share|improve this question

migrated from gardening.stackexchange.com Mar 3 '12 at 13:43

This question came from our site for gardeners and landscapers.

2  
I don't know about quantity, but here in NH the sap has been flowing already -- a couple of weeks early from what I can tell. –  bstpierre Feb 29 '12 at 3:14

1 Answer 1

up vote 3 down vote accepted

This article has a clear explanation (backed up by good links) of the effects of climate change on maple sap production, including the following:

Maple trees produce the best sap on cool days preceded by freezing nights – the cold weather causes the sap in the tree to freeze, creating a low-pressure vacuum that draws more sap up from the roots. When temperatures rise the next day, the sap melts and oozes through the tree, making for easy collection. When temperatures stay abnormally warm, as they have been lately, this process does not occur.

Additionally, the warm weather causes the trees to begin to bud. The hormones that trigger budding also decrease the sap’s sugar content and spoil its taste. This means that it takes much larger quantities of sap to boil down to a gallon of syrup.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.