Fluks CO2 dari Andosol pada Penggunaan Lahan Kebun Sayur dan Hutan di Kecamatan Cisarua Kabupaten Bogor

Abstract

Recently, agricultural activities are considered as one source of greenhouse gas emissions (GHG). Researchs on GHG emission from agricultural land are mostly done on peat soils, while researchs on mineral soil are still limited. This research was aimed to find out and to compare CO2 flux from vegetable garden, forest, and bare land on Andosol, and to compare CO2 flux from peat soils with these of mineral soils. This research was carried out at tea plantation area of PT Sumber Sari Bumi Pakuan, Tugu Utara Village, Cisarua District, Bogor Regency (Puncak area). Gas samples were taken using a chamber method and CO2 measurement was done using a CO2 Analyzer. The results of CO2 flux measurement of each of the land uses on Andosol indicate that CO2 flux from vegetable garden and forest were almost similar, about 4.26 g C-CO2/m2/d and 4.28 g C-CO2/m2/d, while that of bare land showed smaller results, about 2.0 g CCO2/ m2/d. The results of analysis of soil respiration showed the same thing that is CO2 produced from soil of vegetable garden and forest is higher than that of bare land. These results are resembled by the results of the analysis of microbial populations in the soils of vegetable garden and forest that were higher than that of the bare land. That facts indicate that the amount of CO2 flux are more originated from respiration activity that depends on the plants condition and the microbes activity. CO2 flux from three landuses of Andosol ranging from 1.00 to 6.00 g C-CO2/m2/d (3.65-21.90 tons C-CO2/ha/y). The amount of CO2 flux on this range is comparable with that of the CO2 flux from peat soil. CO2 flux from Andosol (high organic matter soil) in this research was lower than that from Latosol (low organic matter soil), indicating that the soil organic matter not directly influence the CO2 flux from the soil. Differences of soil and environmental conditions that affects of plant respiration and soil microbial at the study site are supposed to be a major factor in influencing the difference of CO2 flux.