Serapan Karbondioksida (CO2) Jenis-Jenis Pohon di Taman Buah "Mekar Sari" Bogor, Kaitannya dengan Potensi Mitigasi Gas Rumah Kaca

Carbondioxide (CO2) Absorption by Trees in "Mekar Sari" Fruit Garden, Bogor, in Relation to Green house Gases Mitigation. Biological diversity can make a significant contribution to reducing the build-up of greenhouse gases in the atmosphere. A biological diverse tropical forest with a diverse plant species typically stores 50 times more carbon per unit area compared to monoculture plantation replacing it. Thus, the trees in forests have an essential role in the functioning of the terrestrial biosphere, especially in the carbon cycle. Yet wild tree photosyntheses are poorly studied than crop photosynthesis for several reasons: the large number of species; difficulty in measuring photosynthesis of entire trees or of forest stands. This research aims to assess the contribution of biological diversity in CO2 absorption by analyzing the physiological characteristics (photosynthesis, transpiration, stomatal conductance, leaf chlorophyll content) of tree species in "Mekar Sari" fruit garden, Bogor. The results will provide information on carbon sequestration of some tree species suitable for revegetation. Variance in CO2 assimilation rate is large among trees species. The results showed that there was a wide range of variation of CO2 assimilation rate between tree species. The overall CO2 assimilation rate ranged 2.33 - 13.42 μmolm-2s-1. The highest was Matoa (13.42 molm-2s-1 ) , followed by Kacapi (12.50 μmolm-2s-1), Durian (11.00 μmolm-2s-1) and Nangka (11.00 μmolm-2s-1). Transpiration rate was recorded between 4.29 - 9.50 molm-2s-1. The rate of CO2 assimilation was affected by incident radiation and thus the quantum leaf (Q leaf) as well as leaf chlorophyll content. Correlation between CO2 assimilation and Q leaf under certain environmental condition was considerably high. Variance in stomatal conductance and transpiration rate varied among tree species and were related to light intensity. Jurnal Biologi Indonesia, Vol. 7, No. 1. Hal. 133-145