Why do trees shade leave of during spring instead of in a summer to reduce the rate of transpiration?
397459
but, on the other hand, conifers aren't affected in the spring.  go figure!
735733
The plants have to attempt to get more sunlight in the limited shade. Thus, they expand their surface area to catch more sunlight to get as much sunlight as another plant that is directly in the sunshine.
642859
The tree uses different systems or parts of the body for adaptation of a certain environment. \n\nFor example. The tree which grows in a desert condition will have less leaves and thick leaves (Adaptation to preserve water and minimize evaporation) Roots will be tug deep to find water. \n\nAir affects the trees if there is too much of wind blowing in that cases trees tend to be deep rooted and less broad to with stand the winds. (example coconut trees in sea side)
128854
On the lower surface of leaves are tiny pores called STOMATA.\nAround the edge of these pores are guard cells.\nThe guard cells can change shape to open or close the pores.\nThis allows or prevents water loss.\n\nLook up STOMATA.\nYou could also try this excellent website:
1028154
heat in the winter shade in the summer
201412
I totally agree.  I live in Tennessee and the oak trees are the most beautiful in the fall and they are good shade trees in the summer.
418252
There is a very common myth that it has something to do with farmers, but it is actually and energy conservation measure.  The whole idea was originally a big joke made by Benjamin Franklin.  Not all States in the Union do DST, nor do all Counties in every State.\n\nInterestingly enough, in these days of ubiquitous air conditioning, there may be no cost savings in lighting as was originally intended.\n\nThe reality is that the "Spring Forward" portion of DST causes additional traffic fatalities.  It is a dangerous practice that is continued thanks to governmental inertia and constituent apathy.
1066590
pines tress are not deciduous they are coniferous just to correct the other person, all the other answers about losing leavings in winter are correct.
560032
Trees do NOT get water to their leaves using cappilary action alone. Cappilary action could lift water to maybe 10 metres maximum. The tallest trees are over 8 times that height. Cappilary action plays only a small, albeit vital, role in lifting water in trees.\n\nThe simple answer is that the tree uses the equivalent of a siphon effect to lift the water. A siphon works because water is cohesive, IOW water sticks to water. That cohesiveness of water in a siphon tube means that as water at one end falls it is able to suck more water up from the other end. Provided that the fall is greater than the rise you are trying to overcome you can use a siphon to lift water to significant heights.\n\nA tree trunk is basically composed of masses of siphon tubes filled with water, but it doesn't have any physical 'fall' component. Instead what the tree uses is the force generated by evaporation. As water enters a leaf it is exposed to the air and allowed to evaporate. Because water is cohesive that loss of water creates a negative pressure that pulls more water into the leaf within the leaf, and that in turn creates a negative pressure that pulls water into the vessel elements of the branch and the trunk. That pressure is sufficiently high to lift water to the tops of the tallest trees.\n\nWhich is why trees use such massive quantities of water. Even a small tree will use over 100 litres of water a day and less than 1% of that will be used physiologically. The rest is simply evaporated off to draw more water up the stem. It's an incredibly wasteful process.\n\nThis is also the reason why trees in dry environments are invariably shorter than plants in wetter environments. Because the system functions like a siphon the water column in the trunk can never be allowed to break or the pressure inside will immediately drop to zero. It's like getting vapour lock in a fuel line and plants can't re-prime the line. There has to always be sufficient water in the ground to feed the negative pressure required in the column. The taller the tree the greater pressure required and hence the more water required. As a result the maximum height of tree is determined in large part by the amount of water available.
950189
You did meant to say "months" twice, right?  Because moths and months are slightly different things.\n\nAnyway, the difference is caused by how close the earth is to the sun (during its orbit around the sun.)  When the earth spins each day, it turns from day to night because the earth is facing the sun for half of the turn (roughly) and facing away for the other half (causing day and night.)  But depending on the orbit, the sun hits the earth differently.\n\nThe sun in fall and winter is more direct, I mean, like it hits you in the face.  It's, um, slanted differently.  But the light is weaker since the part of the earth that's having cold weather is tilted further from the sun.  Did I mention that the earth is tilted?  So that way, one hemisphere is tilted closer to the sun during one side of the orbit, and the other hemisphere gets the seasons during the opposite time of year (other side of the orbit.)  \n\nOK, like imagine that this percent mark % represents the northern and southern hemispheres.  Imagine that the % mark is traveling in a circle around a central sphere.  So on one side of the circle, the upper 0 is tilted toward the sun (spring and summer) and the lower 0 is on the other side of the tilted line and it's further from the sun.  But when the % gets to the other side of the circle, the *upper* 0 is on the far side of the tilted line and then the *lower* 0 is closer to the sun.  Which gives you seasons.\n\nI guess it gets lighter and darker faster because there's less clouds in fall and winter (it's colder, so there's less smog and haze and cloud cover in general) so dawn and dusk seem to happen faster.  Plus, there's less light and heat in general.  \n\nI hope that made sense.  The % thing makes sense to me, but if it doesn't, then make yourself a 3D model and see if it makes sense.
7658
There are several ways that these things can happen.  The droughts can be brought on by increased tempurature.  My geography teacher once showed us infrared pictures of the same area of rainforrest, one before the trees were cut down and one after.  The result was a tempurature increase.  A drought could also be caused becasue a of a decrese in transpiration (process of trees giving off water from their leaves).  As for flooding I don't really know, but errosing increases because there are no longer tree roots to hold the soil together.
488248
Water loss from leaves is called transpiration and is greatest when it is hot.\nWhen a mass of warm, moist air is cooled the water vapour will condense and clouds are seen. As cooling progresses the droplets coalesce and fall as rain.\nThis cycle is most obvious in rain forests.\nBoth transpiration and evaporation from the sea and lakes contribute to water vapour in the air, but over continental areas transpiration from trees is of greater importance. Deforestation in these areas leads to dessertification.
609852
they stabilize dust, control erosion, entrap air polluting gases, conserving water and harboring wildlife. Climate control is obtained by moderating the effects of sun, wind, and rain. Radiant energy from the sun is absorbed or deflected by leaves on deciduous trees in the summer and is filtered by their branches in winter. We are cooler when we stand in the shade of trees and are not exposed to direct sunlight. In winter, we value the sun's radiant energy; Wind speed and direction can be affected by trees.\n\nThere are many and many more , hope i could cover the gist.
328151
I would think because the forest canopy shelters the ground from rainfall/snowfall and therefore less erosion takes place down below. I actually just read something very interesting about this: In the Redwood Forest there are parts where the forest canopy actually is dense enough that it creates a whole new "ground" hundreds of feet above the ground. There are even more trees that are growing out of it, as well as plants and animals that are normally found on the actual forest floor!\n\nPS- I'm assuming you mean "watershed" as a ridge of high land dividing two areas that are drained by different river systems.
706971
Quite simple really, the larger, broader and thin walled  the leaf the more evaporation, hot dry climate = small, thin or thick walled leaves, damp = large, broad, thin walled leaves.\n\nSort it from there, that's as much help as I'm willing to give as I refuse to do all your work for you.
16591
During winter, there is not enough light or water for photosynthesis. The trees will rest, and live off the food they stored during the summer. They begin to shut down their food-making factories. The green chlorophyll disappears from the leaves. As the bright green fades away, we begin to see yellow and orange colors. Small amounts of these colors have been in the leaves all along. We just can't see them in the summer, because they are covered up by the green chlorophyll. \n\nThe bright reds and purples we see in leaves are made mostly in the fall. In some trees, like maples, glucose is trapped in the leaves after photosynthesis stops. Sunlight and the cool nights of autumn cause the leaves turn this glucose into a red color. The brown color of trees like oaks is made from wastes left in the leaves. \n\nIt is the combination of all these things that make the beautiful colors we enjoy in the fall. \n\n\n\n\nhttp://www.sciencemadesimple.com/leaves.html\n\nGOOD LUCK\n\nParadiso
198399
If you were a plant you don't want to start growing (from a seed) right next to the parent plant as competition for sunlight and carbon dioxide would occur. Therefore, you want seeds to be dispersed by wind, water etc.