化学除草是农业现代化的重要内容之一,但如选用品种和使用方法不当,还会带来一定的负作用。如山坡林地使用内吸传导型草甘膦化学除草剂,虽然草死根烂,但杂草根系的固土作用也遭到破坏,导致坡地表层肥土流失。如使用触杀型除草剂克芜踪,杂草茎叶触及药液即迅速枯萎死亡,地下的根系却“安然无恙”。既 Chemical weeding is one of the important contents of agricultural modernization. However, if we choose varieties and methods of use improperly, it will also bring some negative effects. For example, the herbicide of systemic glyphosate-type herbicide, which is systemic in hillside woodland, destroys the soil-fixing effect of the weed root system even though it is rotten, resulting in the loss of soil and fat on the surface of slope land. Such as the use of contact-type herbicide grams Wu trace, weeds stems and leaves that liquid quickly die wither, the underground roots are “safe and sound.” Both