Natural Change after Qingming
清明节后的自然变化
A society of natural farming economy employed slash-and-bum cultivation ，burning mountains and destroying forest. Spring was a time when grass and trees start sprouting. To keep a balanced ecology and to preserve a better living environment was a necessity to human being's own survival. It was said in Li Ji—Yue Ling，“During this month,the air pressure of the sky comes down and the air pressure of earth rises up. When the sky and earth come together,grass and trees germinate. It is an edict from god to start farming. ”
自然农耕经济的社会烧荒陆耕，烧山毁林。春天是花草树木开始发芽的季节。为了保持生态平衡，并保持一个更好的生活环境对人类自身的生存是必不可少的。据礼记——月令记载，“在这个月中，天空的压力下滑，地球的空气压力上升。当天空与大地合在一起，草木发芽。这是来自上帝的开始农耕的法令。”
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