氮(N)、磷(P)元素是生物体和生态系统所需的基本元素,通过对华北落叶松人工林内主要22种草本植物各器官的N,P含量进行测定及比较研究,得出:1)该地区草本植物整株植株的N元素含量范围为18.10~42.87 mg/g,P元素含量范围为1.87~4.92 mg/g,其中黄芪各器官的N含量最高,垂芥的叶、茎中 P 含量最高,整株植株的 N:P值范围为6.26~18.95,除紫花地丁植株的N:P值大于16外,其它植株N:P值都小于14;2)草本植物叶中的N与P元素含量要显著高于茎和根,地上部分大于地下部分;3)5个科类中豆科的N元素含量最高,伞形科的P元素含量最高,5个科类的N:P值均小于14。

Nitrogen(N) and phosphorus(P) elements are basic elements needed by organisms and ecosystems.Through the determination and comparative study on the contents of N and P in various organs of 22 main herbaceous plants in Larix principis-rupprechtii Mayr.plantation,it is concluded that:1)The content of N in whole plants of this region ranged from 18.10 to 42.87 mg/g,and the content of P was in the range of 1.87 to 4.92 mg/g.The content of N in organs of Astragalus was the highest and the content of P in leaves and stems of mustards was the highest.The N:P value of a whole plant ranged from 6.26 to 18.95.Except that the N:P value of nerba violue plant was more than 16,the N:P values of other plants were less than 14;2) The contents of N and P elements in leaves of herbaceous plants are significantly higher than those in stems and roots,and the elements in aboveground part is more than those in the underground part;3) Among the five families,the leguminous family had the highest content of N,the umbrella family had the highest content of P,and the N:P values of all the five families were less than 14.