杉木是我国南方特有的优良用材树种 ,在亚热带地区广泛分布。 K、 Mg、 Ca等矿质元素是杉木生长过程中所必需的营养元素 ,它们在叶绿素的形成、光合作用和氮素代谢等生理过程中起重要作用。因此 ,测定这些元素 ,对于了解杉木的营养状况、指导杉木林的科学管理及合理施肥 ,从而 Cunninghamia lanceolata is a kind of excellent timber species unique to southern China, widely distributed in the subtropical region. Mineral elements such as K, Mg and Ca are essential nutrients in the growth of Chinese fir and play an important role in the physiological processes of chlorophyll formation, photosynthesis and nitrogen metabolism. Therefore, the determination of these elements, for understanding the nutritional status of Chinese fir, fir plantation to guide the scientific management and rational fertilization and thus