In order to measure C02 flux in wintertime arctic ecosystems, C02 gas was sampled from various snow-covered grounds by using a closed chamber method during the First China Arctic Scientific Expedition from March to Ma...In order to measure C02 flux in wintertime arctic ecosystems, C02 gas was sampled from various snow-covered grounds by using a closed chamber method during the First China Arctic Scientific Expedition from March to May in 1995. The C02 gas samples were measured by using an infra-red analyzer (IRGA) . The results showed that (i) C02 emission was detected from all kinds of the snow-covered grounds, which provides direct evidence that the arctic tundra is functioning as a source of atmospheric C02; (ii) C02 release was also detected from the permanent ice profile and icecap, and (iii) C02 evolution from terrestrial ecosystems in higher latitudes increased with an increase of surface temperature in accordance with the exponential function. This indicates a close coincidence with that under normal temperature conditions, and provides a useful method for predicting change in C02 flux in the arctic ecosystems with the global climate change.展开更多
基金Project supported in part by the National Natural Science Foundation of China (Grant No. 39425003)The travel expenses for air sampling were partly supported by Land Economy Group.
文摘In order to measure C02 flux in wintertime arctic ecosystems, C02 gas was sampled from various snow-covered grounds by using a closed chamber method during the First China Arctic Scientific Expedition from March to May in 1995. The C02 gas samples were measured by using an infra-red analyzer (IRGA) . The results showed that (i) C02 emission was detected from all kinds of the snow-covered grounds, which provides direct evidence that the arctic tundra is functioning as a source of atmospheric C02; (ii) C02 release was also detected from the permanent ice profile and icecap, and (iii) C02 evolution from terrestrial ecosystems in higher latitudes increased with an increase of surface temperature in accordance with the exponential function. This indicates a close coincidence with that under normal temperature conditions, and provides a useful method for predicting change in C02 flux in the arctic ecosystems with the global climate change.
