Computer Science
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.2149y&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 59, Issue 10, pp.2149-2151
Computer Science
3
Scientific paper
Biomass accumulation (annual net primary productivity, NPP) in a plantation of Musa sp., Musaceae is linearly correlated with solar irradiance (IR) between 100 and 32% of ambient levels (NPP = 0.82 IR + 20.42, p < 0.01, for the normalized data). The irradiance effects are clearly reflected in the 13 C values of leaf organic matter that are also linearly correlated with irradiance levels (with a slope of 0.23%o for any 10% decrease in IR). We conclude that changes in the organic 13 C values faithfully record the irradiance effects on the plants photosynthetic capacity since they are not accompanied by changes in concentration and 13 C values of air CO 2 or by changes in the 18 O values of the leaf cellulose. The results provide a unique, quantitative demonstration of (1) the importance of changes in irradiance such as those associated with cloudiness and aerosols for NPP and (2) the usefulness of the combined 13 C, 18 O analysis for recording and interpreting these effects.
Israeli Yair
Yakir Dan
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