Because during autumn season trees have no leaves, which is main for respiration of trees. How does CO2 process during these time
2007-12-21 06:59:20 · 5 answers · asked by Dangereous_Guy 1 in Science & Mathematics ➔ Botany
Dormant respiration.
Basic life support or basal respiration continues year round in trees that under go ectodormancy in regions of zone 3 or higher. Without chloroplasts they may not photosynthesize but respiration continues in mitochondria throughout the sapwood volume of the plant. The maintenance respiration rate continues depending on the temperature in the woody tissue. Stem respiration increases with spring bud break over several weeks but bole respiration is only slightly increased over winter levels. There is no above ground growth during dormancy but the plant continues basic metabolic functions and minimal below ground growth/repair.
Trees enter dormancy when the whole tree carbon balance shifts. For growth to continue there must be more photosynthate (carbohydrate) made than is used to support basic functions below ground and in the trees woody parts plus reserves for spring bud break. With less light and a decrease in temperature to between 5 & 10 C the tree struggles to support foliage. So there is a break-even point between available light energy and temperature that predicts actual canopy loss but the plant continues to live and respiration continues to support this minimal function.
Thermal acclimation and the dynamic response of plant respiration to temperature
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TD1-48XCGVH-5&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=327b364412ebb863c2b17348a10d521c
aerobic respiration of Douglas-fir seedlings from winter and spring
http://jxb.oxfordjournals.org/cgi/content/full/55/399/1095
http://books.google.com/books?id=8tJSb7-mYGIC&pg=PA442&lpg=PA442&dq=cambial+respiration&source=web&ots=7EzwXYQEsF&sig=UbKLrqNlWNP5AvWpthQ_v_N7Ypg
Pine winter respiration
http://www.springerlink.com/content/mtlf9ruvrexc81mx/
Apple winter respiration
http://www.blackwell-synergy.com/doi/abs/10.1111/j.1365-3040.1981.tb01037.x?journalCode=pce
Stem respiration in northern hardwood forest
http://abstracts.co.allenpress.com/pweb/esa2005/document/?ID=48818
http://www.treesearch.fs.fed.us/pubs/3088
http://www.ingentaconnect.com/content/bsc/nph/2004/00000162/00000001/art00009
http://www.springerlink.com/content/n27731g2163227j5/
Transpiration rate of some forest tree species during the dormant season
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=438097
http://www.western.edu/faculty/jsowell/research/stomata.html
2007-12-21 12:03:46 · answer #1 · answered by gardengallivant 7 · 0⤊ 0⤋
hehehehehe.... very nice question...
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i think..,,,
becoz.... cold season?
There exists however a number of different definitions of autumn some of which are based on the months of the year while others are based on the equinox and solstice.[1]
Around this time, deciduous trees shed their leaves, with the leaves changing to a reddish or brownish hue before falling. Such coloured leaves have come to be colloquially called "fall foliage". In temperate zones, autumn is the season during which most crops are harvested. It is also the season during which days get shorter and cooler, the nights get longer, and precipitation gradually increases (in some parts of the world).
2007-12-21 11:54:13 · answer #2 · answered by gHeLaY aNnE 2 · 0⤊ 0⤋
Yes, Trees also respire through lenticels on their bark
2007-12-21 14:48:22 · answer #3 · answered by Amandaroo 2 · 0⤊ 0⤋
Good point, there are holes in the bark called lenticels which allow air to pass through? Perhaps...
2007-12-21 08:01:49 · answer #4 · answered by Sarah C 2 · 1⤊ 0⤋
They go dormant.
2007-12-21 08:03:18 · answer #5 · answered by aap1970 2 · 0⤊ 0⤋