Journal of Geophysical Research: Biogeosciences
© American Geophysical Union
Impact Factor: 3.318
ISI Journal Citation Reports © Ranking: 2015: 27/184 (Geosciences Multidisciplinary)
Online ISSN: 2169-8961
Associated Title(s): Journal of Geophysical Research
Measuring carbon uptake by karsts in southwestern China
Uptake of carbon (C) by karsts, a type of landscape shaped as water dissolves carbonate bedrock, can be a significant factor in carbon budgets. Yan et al. (2011) measured carbon uptake by karsts in the Houzhai Basin in southwestern China from 1986 to 2007. They estimated that the mean uptake rate was 20.7 g C m-2 yr-1. Surface water and underground water contributed about equally to the carbon uptake. The researchers also observed seasonal and interannual variations in carbon uptake by karsts. In addition, they estimate that the rate of carbon uptake by karsts in all of China is about 12 Tg C yr-1, which is about 57% of the rate of carbon accumulation by forest biomass in China from 1981 to 1998, indicating that karsts are also a relatively important carbon sink. They suggest that carbon uptake by karsts should therefore be included in studies of the regional carbon budget in China.