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時間:2022-08-15 來源:本站 點擊:258次
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明明是春天,重庆街头却黄叶成堆如同秋天,你知道为什么吗?******

原标题:明明是春天,重庆街头却黄叶成堆如同秋天,你知道为什么吗?

今天是一年一度的谷雨,这是春天的最后一个节气,这时候太阳到达黄经30°,源自古人“雨生百谷”之说,这时候也是一年一度最适合播种移苗、埯瓜点豆的时候,然而明明是春天,但是重庆街头,我们看到的景象,却如同秋天一样。

谷雨时节,重庆真的飘起了小雨,中午的时候有短暂放晴,早上和下午都一直沥沥淅淅下过不停,也正是这样的降温的天气,让重庆街头,到处都可以看到大量的落叶,其中以黄桷树最为明显,为什么会这样呢?下午我们一起来聊聊这个话题。

黄桷树原名为黄葛树,是重庆的市树,由于在重庆方言中“角”与“葛”读音相同,加之重庆人认为树木名称应有“木”旁,像金属都有“金”旁,鱼类都有“鱼”旁,江河湖海都有三点水一样,所以重庆人一直都将黄葛树称为“黄桷树”。

作为市树,黄桷树不仅在重庆大街小巷随处可见,而且重庆市名有很多地方都以黄桷命名,比如黄桷坪、黄桷垭、黄桷峡、黄桷渡等,这种树的生命力极为顽强,很多都生长在石坎、石崖和城墙上,根系紧紧地扎在石头缝里,屹然而立。它属于“气生根”植物,只需少量的根系置入土壤就能生长,裸露的根须则可以直接从空气中吸收水分。

黄桷树属高大落叶乔木,其茎干粗壮,树形奇特,悬根露爪,蜿蜒交错,古态盎然。枝杈密集,大枝横伸,小枝斜出虬曲。不仅生命力强大,而且也很长寿,百年甚至几百年的古树在重庆都是很常见的,它们犹如一把把巨伞,为人们遮风挡雨。

至于黄桷树,为什么会在春天落叶?以前常有人解释说是什么季节栽种的,它便在什么时候落叶,其实这样的说活并没有科学依据,属于一种误传,黄葛树是介于落叶与常绿之间的冬青树种,树叶的寿命较长。按理应在深秋初冬的季节落叶却延长到第二年仲春初夏才开始掉落,并且一落叶,马上就长出嫩叶,甚至有些树是边落叶边发新芽。

另一方面,以更科学的解释是,像黄桷树这样的冬青物种,春天落叶延长了叶片的寿命,主要有两个好处,第一是叶片能够更长时间地进行光合作用,为植株在春天的生长提供更多能量,其二则是冬天没有脱落的老叶中的氮磷等养分可以被转运到春天的新生叶中,这样减少了因落叶造成的养分不足,有利于春天新叶的迅速生长。

也正因为如此,所以重庆这几天因为下雨降温而加速了这类冬青树种的落叶,才出现了这组图片中街头落叶成堆的现象,而且这样的现象并不是重庆所独有,南方很多城市都普遍存在这个问题,其中又以黄桷树、阔叶榕等树种为最。

对于这样的解释,你明白了吗?

CNN fires anchor Chris Cuomo over role in brother ex******

CNN fired news anchor Chris Cuomo, the network announced on Saturday, after "additional information" came to light during an investigation into his efforts to help his brother, former New York Governor Andrew Cuomo, deal with allegations of sexual misconduct.。

Cuomo, who hosted CNN's most-watched prime-time news show, had been suspended on Tuesday. He had admitted in May that he had broken some of the cable news network's rules in advising his brother how to handle the allegations from a public relations perspective.。

Andrew Cuomo, 63, was forced to step down in August after several allegations of sexual misconduct. He denies any wrongdoing.。

"Chris Cuomo was suspended earlier this week pending further evaluation of new information that came to light about his involvement with his brother's defense," CNN said.。

"We retained a respected law firm to conduct the review, and have terminated him, effective immediately," it added. The network did not provide details on the new information.。

In a statement on Twitter, Cuomo, 51, said he was disappointed.。

"This is not how I want my time at CNN to end but I have already told you why and how I helped my brother," he said.。

Cuomo was initially suspended after New York Attorney General Letitia James showed text and other messages in which he sought to use his own media sources to find out information on the case and the women involved.。

A criminal complaint charging Andrew Cuomo with a misdemeanor sex offense was filed on October 29 in a New York court.。

Andrew Cuomo, a Democrat, gained national fame last year during the COVID-19 outbreak for his briefings about how New York was dealing with the outbreak, and often appeared on his brother's show. The brothers' father, the late Mario Cuomo, also served as governor of New York.。

(Agencies)。

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Uruguay sack manager Oscar Tabarez******

MONTEVIDEO, Nov. 19 (Xinhua) -- Uruguay has sacked manager Oscar Tabarez after more than 15 years in the job amid a poor run of results in World Cup qualifiers, the country's football association said on Friday.。

The announcement came three days after the Celeste lost 3-0 to Bolivia in La Paz, the team's fourth defeat in as many qualifiers.。

"The executive committee ... has taken this difficult decision in virtue of the present circumstances with a commitment to the future and to achieving the results that we all want," read a statement on the Uruguayan Football Association's (AUF) official website.。

"We express our respect and acknowledge his professionalism and dedication over such a long period," the statement added.。

Tabarez had been in charge of Uruguay since March 2006 and steered the Celeste to the quarterfinals of the 2018 World Cup in Russia, where they were eliminated by eventual champions France.。

He also coached the national team from 1988 to 1990.。

In total, the 74-year-old guided Uruguay to four World Cups during his two spells as coach: Italy in 1990, South Africa in 2010, Brazil in 2014 and Russia in 2018.。

Former Uruguay striker Diego Forlan was among a number of current and former players to express their gratitude to Tabarez on social media following his dismissal.。

"Thank you, maestro, for everything you have done for Uruguay's national football team and the country," tweeted Forlan, who won the Golden Ball award for the best player at the 2010 World Cup.。

"You marked a before and an after, and that's why your name will go down in history."

Uruguay is currently seventh in the 10-team South American qualifying group for the 2022 World Cup.。

The top four teams will automatically earn a place at football's showpiece tournament in Qatar while the fifth-ranked side will advance to an intercontinental playoff.。

The AUF did not immediately say who would replace Tabarez. Enditem。

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