Untangling the effects of root age and tissue nitrogen on root respiration in Populus tremuloides at different nitrogen supply.

ABSTRACT: Root respiration is a major contributor to terrestrial carbon flux. Many studies have shown root respiration to increase with an increase in root tissue nitrogen (N) concentration across species and study sites. Studies have also shown that both root respiration and root N concentration typically decrease with root age. The effects of added N may directly increase respiration of existing roots or may affect respiration by shifting the age structure of a root population by stimulating growth. To the best of our knowledge, no study has ever examined the effect of added N as a function of root age on root respiration. In this study, root respiration of 13-year-old Populus tremuloides Michx. trees grown in the field and 1-year-old P. tremuloides seedlings grown in containers was analyzed for t

SUBMITTER: Ceccon C 

PROVIDER: S-EPMC4886293 | biostudies-literature | 2016 May

REPOSITORIES: biostudies-literature