关键词: 华北落叶松人工林, 草本植物, 化学计量, 元素

Abstract:

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.

Key words: Larix principis-rupprechtii Mayr.plantation, herbaceous plants, ecological stoichiometry, element