期刊
GLOBAL CHANGE BIOLOGY
卷 28, 期 3, 页码 883-898出版社
WILEY
DOI: 10.1111/gcb.15955
关键词
boreal peatland; decomposition; elevated CO2; lipid biomarker; organic matter; stable carbon isotope; warming
资金
- Schweizerischer Nationalfonds zur Forderung der Wissenschaftlichen Forschung [200021_172744, PZ00P2_180030]
- U.S. Department of Energy [DE-AC05-00OR22725]
- Swiss National Science Foundation (SNF) [PZ00P2_180030, 200021_172744] Funding Source: Swiss National Science Foundation (SNF)
The study shows that rising temperatures and increasing atmospheric CO2 levels may impact carbon cycling in peatlands, but under current hydrological conditions, these factors are likely to offset each other.
Rising temperatures have the potential to directly affect carbon cycling in peatlands by enhancing organic matter (OM) decomposition, contributing to the release of CO2 and CH4 to the atmosphere. In turn, increasing atmospheric CO2 concentration may stimulate photosynthesis, potentially increasing plant litter inputs belowground and transferring carbon from the atmosphere into terrestrial ecosystems. Key questions remain about the magnitude and rate of these interacting and opposing environmental change drivers. Here, we assess the incorporation and degradation of plant- and microbe-derived OM in an ombrotrophic peatland after 4 years of whole-ecosystem warming (+0, +2.25, +4.5, +6.75 and +9 degrees C) and two years of elevated CO2 manipulation (500 ppm above ambient). We show that OM molecular composition was substantially altered in the aerobic acrotelm, highlighting the sensitivity of acrotelm carbon to rising temperatures and atmospheric CO2 concentration. While warming accelerated OM decomposition under ambient CO2, new carbon incorporation into peat increased in warming x elevated CO2 treatments for both plant- and microbe-derived OM. Using the isotopic signature of the applied CO2 enrichment as a label for recently photosynthesized OM, our data demonstrate that new plant inputs have been rapidly incorporated into peat carbon. Our results suggest that under current hydrological conditions, rising temperatures and atmospheric CO2 levels will likely offset each other in boreal peatlands.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据