Biomass partitioning in red pine (Pinus resinosa) along a chronosequence in the Upper Peninsula of Michigan

Content Provider	Semantic Scholar
Author	King, John S. Giardina, Christian P. Pregitzer, Kurt S.
Copyright Year	2007
Abstract	Carbon (C) allocation to the perennial coarse-root system of trees contributes to ecosystem C sequestration through formation of long-lived live wood biomass and, following senescence, by providing a large source of nutrient- poor detrital C. Our understanding of the controls on C allocation to coarse-root growth is rudimentary, but it has im- portant implications .for projecting belowground net primary production responses to global change. Age-related changes in C allocation to coarse roots represent a critical uncertainty for modeling landscape-scale C storage and cy- cling. We used a 55 year chronosequence approach with complete above- and below-ground harvests to assess the ef- fects of stand development on biomass partitioning in red pine (Pinus resinosa Ait.), a commercially important pine species. Averaged within sita, individual-tree rootlshoot ratios were dynamic across stand development, changing from 0.17 at 2-, 3-, and 5-year-old sites, to 0.80 at the 8-year-old site, to 0.29 at the 55-year-old site. The results of our study suggest that a current research challenge is to determine the generality of patterns of root-shoot biomass parti- ' tioning through stand development for both coniferous and hardwood forest types, and to document how these patterns change as a function of stand age, tree size, environment, and management. RCsumC : L'allocation du carbone (C) aux grosses racines ptrennes des arbres contribue au pikgeage du C des Ccosys- tkmes en produisant une biomasse vivante de bois d'une grande longiviti et en creant, aprbs la senescence, une impor- tante source de C dans des dktritus i faible teneur en nutriments. Cependant, notre comprthension des facteurs qui contrelent l'allocation du C B la croissance des grosses racines est rudimentaire, ce qui enbdne d'importantes rkpercus- sions pour la prediction de la production primaire nette des racines en reaction aux changements climatiques. Les chan- gements dans l'allocation du C aux grosses racines en fonction de l'gge reprCsentent une incertitude cruciale pour modtliser I'entreposage et le recyclage du C B l'kchelle du paysage. Nous avons eu recours 2 une chronosBquence d'une durke de 55 ans, qui incluait la rtcolte compMte des tissus a6riens et racinaires, pour ivaluer les effets du dive-
Starting Page	93
Ending Page	102
Page Count	10
File Format	PDF HTM / HTML
DOI	10.1139/x06-217
Volume Number	37
Alternate Webpage(s)	https://naldc.nal.usda.gov/naldc/download.xhtml?content=PDF&id=8069
Alternate Webpage(s)	https://doi.org/10.1139/x06-217
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article