摘要：The following ten papers are based on presentations made in the sessions on Terrestrial systems and feedbacks on climate change (session 3) and Biogeochemical cycles in the Arctic and Antarctic (session 6). The issues addressed in these sessions all dealt with research questions identified as of highest priority in several programmes under the International Geosphere-Biosphere Programme (IGBP) such as GCTE, BAHC, IGAC, WOCE and JGOFS.
