Abstract:
:CO2 assimilation in relation to light intensity and the relationship between leaf nitrogen and phosphorus concentrations and CO2 assimilation in 14 species of ecologically important Zimbabwean trees were examined. Eight of the species are members of the Fabaceae (Leguminosae). In the majority of Zimbabwean climax woodlands, the dominant trees are non-nodulating members of the sub-family Caesalpinioideae. The species examined have higher light saturation points (>700 μmol m-2 s-1) than woody species from temperate areas; one species, Acacia nigrescens, did not reach saturation at photon fluxes greater than 1500 μmol m-2 sec-1. Higher leaf nitrogen content was found to correlate positively with higher CO2 assimilation rates (r=0.85; P≦0.0003); there was no correlation between leaf phosphorus content and CO2 uptake rates. There were no significant differences between sites in terms of leaf nitrogen or phosphorus content, but the mean photosynthetic rate at one of the sites (Chizedzi) was lower. Taxa from the nodulating legumes were found to have higher leaf nitrogen contents (309.1±SD 22 mmol m-2) than those of the non-nodulating species (239±33); the lowest nitrogen contents were found in nonleguminous trees (179±42), with the exception of Ziziphus mucronata. This species may form an association with an N2-fixing actinomycete.
journal_name
Oecologiajournal_title
Oecologiaauthors
Tuohy JM,Prior JA,Stewart GRdoi
10.1007/BF00317582subject
Has Abstractpub_date
1991-11-01 00:00:00pages
378-382issue
3eissn
0029-8549issn
1432-1939pii
10.1007/BF00317582journal_volume
88pub_type
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