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我了解到草不仅仅是牛吃的草，它包含了许多经济上重要的植物，甚至可以说，没有草就没有我们的文明。草几乎无处不在，覆盖了地球陆地的大部分面积。它不仅仅是田野里供牛食用的东西，还包括世界上一些最重要的经济作物。从多个层面来看，如果没有草，我们的文明将不复存在。草是单子叶植物，种类繁多，包括小麦、水稻、大麦、黑麦、甘蔗甚至竹子。谷物形式的草类直接提供了人类消耗的50%以上卡路里，间接影响更大。地球约40%的陆地被草覆盖，是食草动物生态系统的基础，使边际土地变得富有生产力，并在碳封存中发挥关键作用。草通过根系将碳储存在土壤中，使草原成为有弹性的碳汇。虽然草类进化历史相对较晚，但迅速成为地球上最成功的植物之一。恐龙可能吃过原始草类，但草类在白垩纪末期的大灭绝后才真正兴起。在古近纪和新近纪时期，全球气温下降，森林退缩，为草类繁荣创造了理想条件。草类进化出了适应干旱环境的关键特性，如窄叶和深根系统。草类和反刍动物在许多生态系统中共同进化，草类能耐受甚至受益于放牧。反刍动物通过修剪植被、刺激生长、传播种子和施肥来帮助草类。草类适应周期性火灾，具有耐火根系和促进火势蔓延的特性。

Deep Dive

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Grass is far more important than you might think. It's one of the most common plants on Earth, and it plays a vital role in our civilization and ecosystem. This chapter explores the definition of grass, its diversity, and its significance as a source of calories for humans.
  • Grass is a large and diverse group of flowering plants belonging to the family Poaceae.
  • There are over 12,000 different species of grass.
  • Grasses are responsible for over 50% of all calories consumed by humans.
  • 40% of the land area on Earth is covered by grass.

Shownotes Transcript

One of the most common types of plants in the world is grass. 

Grass is almost everywhere. An enormous part of the landmass on Earth is covered with grass. 

Grass isn’t just stuff in a field that cows eat, although that is part of it. Grasses also include some of the most economically important plants in the world. 

On many different levels, our civilization would not exist if it weren’t for grass. 

Learn more about grass, what it is, and its important role in the world on this episode of Everything Everywhere Daily.

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