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The use of temperature gradient tunnels for studying the combined effect of CO 2 , temperature and water availability in N 2 fixing alfalfa plants
Author(s) -
ARANJUELO I,
IRIGOYEN J J,
PEREZ P,
MARTINEZCARRASCO R,
SANCHEZDÍAZ M
Publication year - 2005
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.2005.04074.x
Subject(s) - biology , photosynthesis , agronomy , nitrogen fixation , mediterranean climate , dry matter , nitrogen , nodule (geology) , botany , ecology , chemistry , paleontology , genetics , organic chemistry , bacteria
Summary Atmospheric CO 2 concentration and temperature are increasing as a consequence of human activity. Periods of low water availability are expected to increase in Mediterranean ecosystems. Temperature gradient tunnels were used to provide near to ambient conditions and conditions simulating predicted increases in CO 2 and temperature for an alfalfa crop. The performance, construction, and running costs of the tunnels are reported and discussed. Two levels of water supply were included in the treatments. Plants were grown in large, 13 L pots, keeping a fixed soil volumetric water content and with nodule fixation as the only nitrogen source for the plant. Regardless of water regime, the effect of elevated CO 2 on plant growth was temperature dependent. Dry matter was enhanced when elevated CO 2 and temperature were combined. Plant yield improvement was partly a result of increased photosynthetic rates. There were no effects on plant N concentration. Decreased specific nodule activity might suggest that lack of differences in plant N were a consequence of reduced nodule enzyme activity.