Agriculture and environmental change at Qingpu, Yangtze delta region, China: a biomarker, stable isotope and palynological approach
MetadataShow full item record
Rice (Oryza sp.) agriculture sustains vast numbers of people and, despite great advancements made in recent years, questions about its origins and spread throughout Asia remain unanswered. This study uses sedimentary biomarker, stable carbon isotope and palynological analyses to investigate early rice agriculture in the Yangtze delta, a region where rice agriculture emerged at least 7000 years ago. Accelerator mass spectrometer (AMS) C-14 dating reveals the age of sedimentary section to be between c. 6000 and 1800 cal. BP. Widespread clearing of forest vegetation c. 2400 cal. BP, is the earliest major human influence detected in the Qingpu record. Following this, rice agriculture probably dominated the Qingpu area. Evidence supporting rice agriculture after c. 2400cal. BP is provided by increased Poaceae and Cereal-type taxa, which occur with high concentrations of plant wax n-alkanes with a dominant C-3 plant origin (C-27-C-31 with odd/even preference, delta C-13 -29.8 parts per thousand to -36.3 parts per thousand). Also, high concentrations of a C-20 highly branched isoprenoid (HBI) thought to be from epiphytic algae associated with rice agriculture occur after c. 2400cal. BP. C-13-depleted diploptene (in high concentrations) and C-13-depleted C-31 3b-methylhopanes of methanotrophic bacterial origin also occur after c. 2400cal. BP. The strong methane cycle detected in the trench sediment may have provided an alternative CO2 source for plants and algae associated with rice agriculture.
The link to the journal’s home page is: http://hol.sagepub.com/
The final, definitive version of this paper has been published in The Holocene, Vol. 17, No. 4, May 2007, by SAGE Publications Ltd, All rights reserved. Copyright © 2007 by SAGE Publications
Showing items related by title, author, creator and subject.
Benu, Fredrik Lukas (2003)This study examines agricultural productivity and farmers' welfare in West Timor, Indonesia. The driving force behind this study is to understand why the welfare of farmers has lagged behind others despite significant ...
Paris, T.; Ngoc Chi, T.; Rola-Rubzen, Maria Fay; Luis, J. (2009)Vietnam is one of the major rice-producing countries in Asia, and since 1989 it has been a rice-exporting country. However, poor rice-farming households that depend primarily upon their own labor for farming face significant ...
Greenhouse gas implications of novel and conventional rice production technologies in the Eastern-Gangetic plainsAlam, K.; Biswas, Wahidul; Bell, R. (2015)Wetland rice (Oryza sativa L.) production contributes 55% of agricultural greenhouse gas (GHG) emissions in the world. Hence any new technology with the potential to reduce the GHG emissions of wetland rice could make a ...