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《本草纲目》中说:“桑有数种,有白桑,叶大如掌而厚;鸡桑,叶花而薄;子桑,先椹而后叶;山桑,叶尖而长。以子种者,不若压条而分者。桑生黄衣,谓之金桑,其木必将槁矣。”桑树是我国最常见的树种之一,桑树不仅在治病疗疾中用途广泛,还是优良的抗污树,在距氟化氢、二氧化硫、氧化氮肥等有害气体三百米之内,有些树种的叶片会因被污染而卷曲,叶缘和叶脉出现黄斑。但大面积的桑树却不会受害,因为桑树具有吸收有害气体的能力。
“Compendium of Materia Medica,” said: "There are several kinds of mulberry, there are white mulberry, leaves as large as the palm and thick; chicken mulberry, leaf flower and thin; mulberry, first simmer and then leaves; mountain mulberry, leaf tip and long. In sub-species If you don’t divide the slivers, Sangsheng Huangyi is said to be Jinsang, and its wood must be smashed.” “Mulberry is one of the most common tree species in China. Mulberry trees are not only widely used in curative diseases, but also excellent. The anti-pollution trees are within 300 meters of harmful gases such as hydrogen fluoride, sulfur dioxide, and nitrogen oxide fertilizers. The leaves of some tree species will be curled due to contamination, and yellow spots will appear on leaf margins and veins. However, large areas of mulberry trees will not be harmed, because mulberry trees have the ability to absorb harmful gases.