优胜美地国家公园的马里波萨谷巨杉林，美国加利福尼亚州 Mariposa Grove in Yosemite National Park, California (© Orbon Alija/Getty Images)

优胜美地国家公园的马里波萨谷巨杉林，美国加利福尼亚州 Mariposa Grove in Yosemite National Park, California (© Orbon Alija/Getty Images)

温暖的阳光穿过古老森林 Warm light through an ancient forest

马里波萨谷巨杉林

四月的最后一个星期五是美国的植树节，这一天，人们会庆祝植树成果、倡导保护树木。植树节最早起源于19世纪70年代初的内布拉斯加州，1872年，就职于《内布拉斯加州城市新闻》的记者朱利叶斯·斯特林·莫顿(Julius
Sterling Morton)在公共平台上发起了美国第一个植树节，并提议为内布拉斯加州人民设立一个种树日，于是植树节应运而生。

Arbor Day

We're celebrating Arbor Day with some of Yosemite's most famous residents, the giant sequoia trees of Mariposa Grove. The day champions the planting and preservation of trees and can trace its roots back more than 150 years. In 1872, Nebraska City News editor Julius Sterling Morton proposed a day for locals to plant trees, and the idea grew and grew. Today all 50 states celebrate Arbor Day, most commonly on the last Friday in April, although different states might observe it on the best dates for tree planting in their area.

Giant sequoias, like the ones on our homepage, have been around for a very long time. Geological evidence suggests that they are the third-longest-lived tree species in the world. There are hundreds of them in Yosemite's Mariposa Grove, including the famous Grizzly Giant, which is estimated to be about 3,000 years old. Let's hope it is around for thousands of Arbor Days to come.