由于黑胡桃树(Juglans nigra L.)的叶、果壳及根部内含有胡桃醌(5-羟基-1,4-萘醌),这种物质对其它树种有克生现象,所以土地经营者都不愿意用黑胡桃树与其它树种营造混交林。1967年Perry发现胡桃醌对蕃茄及豆类作物的叶面具有如同缺氧一般抑制呼吸的作用;1949年Schreiner、1974年Wiant及Ramirez也发现生长于黑胡桃树附近的几种针叶树受到危害。为求得针叶树对胡桃醌的反应量,我们于 Since juglans nigra L. contains juglone (5-hydroxy-1,4-naphthoquinone) in its leaves, husks and roots, this material has the potential of overcrowding with other tree species, so both landowners Do not want to use black walnut trees and other species to create mixed forest. In 1967, Perry discovered that juglone has the same inhibitory effect on the foliage of tomatoes and legumes as hypoxia; in 1949 Schreiner, 1974, 1974, Wiant and Ramirez also found that several conifers growing near black walnut trees were harmed. To determine the response of coniferous juglone, we have