Premium
Comparison of gas use efficiency and treatment uniformity in a forest ecosystem exposed to elevated [CO 2 ] using pure and prediluted free‐air CO 2 enrichment technology
Author(s) -
LEWIN KEITH F.,
NAGY JOHN,
ROBERT NETTLES W.,
COOLEY DAVID M.,
ROGERS ALISTAIR
Publication year - 2009
Publication title -
global change biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.146
H-Index - 255
eISSN - 1365-2486
pISSN - 1354-1013
DOI - 10.1111/j.1365-2486.2008.01748.x
Subject(s) - fumigation , environmental science , atmospheric sciences , ecosystem , environmental chemistry , ecology , chemistry , biology , geology
Abstract A direct comparison of treatment uniformity and CO 2 use of pure and prediluted free‐air CO 2 enrichment (FACE) systems was conducted in a forest ecosystem. A vertical release pure CO 2 fumigation system was superimposed on an existing prediluted CO 2 fumigation system and operated on alternate days. The FACE system using prediluted CO 2 fumigation technology exhibited less temporal and spatial variability than the pure CO 2 fumigation system. The pure CO 2 fumigation system tended to over‐fumigate the upwind portions of the plot and used 25% more CO 2 than the prediluted CO 2 fumigation system. The increased CO 2 use by the pure CO 2 system was exacerbated at low wind speeds. It is not clear if this phenomenon will also be observed in plots with smaller diameters and low‐stature vegetation.