 |
| Titel |
Estimation of whole-tree and stand-level methane emissions from the stems of
\textit{Alnus japonica} in a cool-temperate forested peatland |
| VerfasserIn |
Kazuhiko Terazawa, Kenji Yamada, Tadashi Sakata, Takatoshi Nakamura, Shigehiro Ishizuka |
| Konferenz |
EGU General Assembly 2016
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250124034
|
| Publikation (Nr.) |
 EGU/EGU2016-3399.pdf |
|
|
|
|
|
| Zusammenfassung |
| We measured methane (CH4) fluxes at the stem surfaces of canopy trees in a forested
peatland of northern Japan to estimate: 1) the CH4 emission rates from the stems of
individual trees and 2) the stem CH4 emission rates at the stand level. The study site was
located ca. 1 km south of Lake Tofutsu, a brackish lake in eastern Hokkaido. An
experimental plot was established in an area dominated by Alnus japonica trees. For seven
A. japonica, the stem CH4 fluxes were measured using a static closed-chamber
method. Three of the sample trees were used to estimate the whole-tree stem CH4
emissions. The CH4 flux was measured at six heights (0.15 – 5.15 m above the
ground at 1 m intervals) on the stem of each tree, using a scaffold constructed beside
the tree. The stand-level stem CH4 emissions were estimated from the CH4 fluxes
measured 0.15 m above the ground; the relationship between stem height and CH4
flux and the relationship between diameter at breast height and whole-tree CH4
emissions were determined. Stem CH4 emission rates were highest at the lowest
measurement position on the stem (height 0.15 m), and decreased with stem height for
all measurements. Nevertheless, significant CH4 emissions were detected 5.15 m
above the ground. The relationship between stem height and CH4 emissions fit
a power function. The estimated CH4 emission rate from the stem surface of an
individual tree was 1.91 ± 1.24 and 0.68 ± 0.18 mg tree−1 h−1 for late-August
and mid-September, respectively. The estimated stem CH4 emissions at the stand
level varied seasonally, with the highest rate of 556 mg ha−1 h−1 in September. |
|
|
|
|
|
|