|Title||Woody stem production in Alaskan tundra shrubs|
|Publication Type||Journal Article|
|Year of Publication||1986|
|Keywords||D 04140 Taiga/tundra|
The contribution of woody stems to the aboveground net primary production (NPP) of several species of tundra shrubs was documented at four sites in northern and central Alaska. To measure stem secondary growth, a new method was developed based on the ability to measure the changes in mass per unit length of stem segments of known age. Net accumulation of N and P in woody stems was also estimated, from additional measurements of changes in element concentration with stem age. Results showed that stem secondary growth was an important component of NPP in all species and sites, ranging from 13 to 49% of total aboveground NPP for individual species. The most productive species and sites had the highest proportions of NPP accounted for by secondary growth. Accumulation of N and P in woody stems occurred at slower rates, presumably due to internal reuse of these elements, but still accounted for 5-19% of the annual net aboveground N accumulation and 6-24% of the P accumulation.
|Short Title||Woody stem production in Alaskan tundra shrubs|