Title
Exploring the Ecological History of a Tropical Agroforestry Landscape Using Fossil Pollen and Charcoal Analysis from Four Sites in Western Ghats, India
Date Issued
01 January 2018
Access level
open access
Resource Type
journal article
Author(s)
University of Oxford
Publisher(s)
Springer New York LLC
Abstract
Contrary to expectations, some human-modified landscapes are considered to sustain both human activities and biodiversity over the long-term. Agroforestry systems are among these landscapes where crops are planted under native shade trees. In this context, ancient agroforestry systems can provide insight into how farmers managed the landscape over time. Such insight can help to quantify the extent to which tropical forests (especially habitat-specialist trees) are responding to local and landscape-level management. Here, we extracted fossil pollen (indicator of past vegetation changes) and macroscopic charcoal (indicator of biomass burning) from four forest hollows’ sedimentary sequences in an ancient agroforestry system in Western Ghats, India. We used a mixed-modelling approach and a principal components analysis (PCA) to determine past trajectories of forest change and species composition dynamics for the last 900 years. In addition, we reconstructed the long-term forest canopy dynamics and examined the persistence of habitat-specialist trees over time. Our results show that the four sites diverged to a surprising degree in both taxa composition and dynamics. However, despite these differences, forest has persisted over 900 years under agricultural activities within agroforestry systems. This long-term analysis highlights the importance of different land-use legacies as a framework to increase the effectiveness of management across tropical agricultural lands.
Start page
45
End page
55
Volume
21
Issue
1
Language
English
OCDE Knowledge area
Agricultura
Forestal
Conservación de la Biodiversidad
Ecología
Subjects
Scopus EID
2-s2.0-85016980246
Source
Ecosystems
ISSN of the container
14329840
Sponsor(s)
Utah Academy of Sciences, Arts and Letters - UASAL
This research was supported by the Leverhulme Trust Grant (F/08 773/E), the British Ecological Society, and the Norwegian Academy of Science and Letters through the VISTA programme (6158) through a postdoctoral fellowship to SN. We are thankful to C. Cornwell and S. Subitani for help with some of the charcoal analysis, Matt Telfer for support with the 210 Pb, and A. Smith and P. Langdon for comments on an early version of this manuscript. We also thank T. Brncic for help with coring, C.G. Kushalappa and the College of Forestry for field assistance. R. Premathilake, K. Anupama, S. Prasad and the Palynology Laboratory at the French Institute, Pondicherry, for help with identification. S. Harris and the University of Oxford?s Plant Sciences Herbarium for access to reference collections. All authors designed the study. SN, CT, and WF analysed the data. SN leads the writing, with contributions from all authors.
Sources of information:
Directorio de Producción Científica
Scopus