Response of a warm temperate peatland to Holocene climate change in northeastern Pennsylvania |
| |
| Authors: | Shanshan Cai Zicheng Yu |
| |
| Institution: | a Department of Earth and Environmental Sciences, Lehigh University, 1 West Packer Avenue, Bethlehem, PA 18015, USA |
| |
| Abstract: | Studying boreal-type peatlands near the edge of their southern limit can provide insight into responses of boreal and sub-arctic peatlands to warmer climates. In this study, we investigated peatland history using multi-proxy records of sediment composition, plant macrofossil, pollen, and diatom analysis from a 14C-dated sediment core at Tannersville Bog in northeastern Pennsylvania, USA. Our results indicate that peat accumulation began with lake infilling of a glacial lake at ~ 9 ka as a rich fen dominated by brown mosses. It changed to a poor fen dominated by Cyperaceae (sedges) and Sphagnum (peat mosses) at ~ 1.4 ka and to a Sphagnum-dominated poor fen at ~ 200 cal yr BP (~ AD 1750). Apparent carbon accumulation rates increased from 13.4 to 101.2 g C m? 2 yr? 1 during the last 8000 yr, with a time-averaged mean of 27.3 g C m? 2 yr? 1. This relatively high accumulation rate, compared to many northern peatlands, was likely caused by high primary production associated with a warmer and wetter temperate climate. This study implies that some northern peatlands can continue to serve as carbon sinks under a warmer and wetter climate, providing a negative feedback to climate warming. |
| |
| Keywords: | Carbon accumulation Plant macrofossil Fossil pollen Poor fen Peatland Climate change Holocene |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
