b***k 发帖数: 654 | |
R***U 发帖数: 1860 | 2 刚长出来是绿的,一晒太阳就红了。
【在 b***k 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 不是由绿变红?
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b***k 发帖数: 654 | 3 那看样子我家门前的不是日本枫了, 我就没见它有绿叶子
【在 R***U 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 刚长出来是绿的,一晒太阳就红了。
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j****d 发帖数: 83 | 4 你家前门可能朝东南, 总有太阳
【在 b***k 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 那看样子我家门前的不是日本枫了, 我就没见它有绿叶子
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b***k 发帖数: 654 | 5 对,是朝南的。。 我对照网上的照片看象是一颗日本枫,
只是不确定叶子的颜色, 网上大部分是红的, 但也有绿的。
【在 j****d 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 你家前门可能朝东南, 总有太阳
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b***k 发帖数: 654 | 6
【在 b***k 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 不是由绿变红?
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d*******8 发帖数: 3182 | 7 u right
我家后院有两棵树,一棵是日本枫,另一棵还是日本枫,从来见不到太阳,只要叶子从
骨朵里一展开,就是红的。
【在 b***k 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 不是由绿变红?
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H******7 发帖数: 34403 | 8 日本枫叶子刚出来是红的,太阳爆晒后会变绿干枯,然后脱落休棉 |
b***k 发帖数: 654 | 9 赫赫。。先红后绿?
【在 H******7 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 日本枫叶子刚出来是红的,太阳爆晒后会变绿干枯,然后脱落休棉
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a***y 发帖数: 2803 | 10 很多品种.有的一直是红的,有的变色.
【在 b***k 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 不是由绿变红?
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b*****1 发帖数: 1731 | 11 我家的一直是红叶。冬天落叶。
【在 b***k 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 不是由绿变红?
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H******7 发帖数: 34403 | 12 从颜色看这个可能是鸡爪槭。日本疯是那种很艳的红
【在 b***k 的大作中提到】![](/moin_static193/solenoid/img/up.png)
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y****t 发帖数: 714 | |
a**s 发帖数: 1398 | 14 返老还童。
【在 b***k 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 赫赫。。先红后绿?
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b***k 发帖数: 654 | 15 很象, 不过还是颜色问题, "入秋叶色变红" 是网上说的, 我家的一出来就是红的.
【在 H******7 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 从颜色看这个可能是鸡爪槭。日本疯是那种很艳的红
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H******7 发帖数: 34403 | 16 枫树品种很多的。比如:
http://www.botanicalgarden.ubc.ca/forums/showthread.php?t=3794
The red color comes from the presence of sugars stored in the leaves.
Some maples produce and store more than others. The sugars are produced
by photosynthesis during the day as sunlight is absorbed. The tree for
normal respiration and metabolic functions uses the sugars. The rate of
sugar production is a function of daylight hours and the rate of
respiration is a function temperature. The red color is strongest in the
spring when the sunlight hours are increasing and the temperatures are
still cool. This results in high sugar production and low consumption.
The longest days are in June, in the northern hemisphere. As the days
get shorter in mid to late summer the production of sugar decreases and
with higher temperatures the consumption of sugar increases. This
results in a net loss of sugar and as a result the red color fades to
green as the sugar is depleted.
Some cultivars produce more sugar or consume less and as a result hold
on to the sugars and red color longer. A tree planted in shade produces
less sugar yet consumes the same as one planted in sun resulting in a
loss of the red color sooner in the summer. This also explains why the
red color lasts longer in northern latitudes than in the southern areas.
The hours of daylight are longer in the northern latitudes during the
summer and usually the temperatures are lower resulting in the sugars
remaining in the leaves later in the year. The same cultivar planted in
the same conditions in Portland might hold the red color until late
August while the one in Atlanta might “bronze out” in late July. The
result of an hour more of daylight and nighttime lows of 62 degrees
verses 75 degrees.
I know that there are probably more correct technical terms and this may
be an over simplification. And, it may be way more than you asked for.
【在 b***k 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 很象, 不过还是颜色问题, "入秋叶色变红" 是网上说的, 我家的一出来就是红的.
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