PROGRESS IN GEOGRAPHY ›› 2005, Vol. 24 ›› Issue (5): 50-60.doi: 10.11820/dlkxjz.2005.05.006

• Original Articles • Previous Articles     Next Articles

The Feedback and Response of the Riverine Carbon Cycle to Global Changes

YAO Guanrong, GAO Quanzhou   

  1. School of Geography and Planning, Zhongshan (Sun Yat-sen) University, Guangzhou 510275, China
  • Received:2005-04-01 Revised:2005-07-01 Online:2005-09-25 Published:2005-09-25

Abstract:

River system is a critical linkage between the terrestrial ecosystem and the ocean two major active carbon pools in global carbon cycle. The export and cycle processes of the riverine carbon are closely related to coastal zone environment, dynamics of the ocean carbon pool and the global climate system. Organic carbon plays the key role in the global carbon cycle, and to understand the fluxes and characteristics of the riverine organic carbon is an important subject in present studies of the riverine carbon cycle. The area of the drainage basin and differences in climate and environment markedly impact the export and cycle processes of the riverine carbon. At present, a large number of small rivers and the rivers in monsoonal Asia lack systemic information about biogenic components of riverine suspended matters. The fate and main sources of the riverine carbon are controlled by the processes of terrestrial erosion-deposition. Nowadays, human activities dominate the condition of terrestrial erosion-deposition, which accelerates redeposition and perturbation of terrestrial ecosystem carbon pool, and strengthens carbon transportation from land to ocean. It is necessary to pay more attention to impacts of human activities on the riverine carbon cycle.

Key words: flux, global change, human activities, organic carbon, riverine carbon cycle