Drought Significantly Decreases Carbon Storage and Soil Respiration in Moso Bamboo Stand in Southeast China
Abstract
Drought can severely affects alteration of carbon sink-source relationships through impacts on carbon storage and carbon emission in forest ecosystems. On-site field experiment is very rare on drought effect on forest carbon cycle, especially in subtropical forest ecosystems. In this study, we imposed drought to a moso bamboo stand by excluding throughfall to the forest floor beginning in July 2012, and measured biomass carbon, soil carbon, and soil respiration during specific period over the drought duration. Bamboo shoot number, new culm number, and their height and diameter at breast height were significantly lower in throughfall exclusion (TE) plots than in control (CK) plots, with decrease of 64.6, 70.8, 10.6 and 11.3%,respectively. Annual carbon sequestration for TE plots was 58.1% lower than that for CK plots. Soil carbon storage in the 0-60-cm layer in CK and TE plots decreased by 3.7 and 12.2%, respectively, during the 10-month experiment period. Drought led to ~10% decrease for ecosystem carbon storage in moso bamboo stand. On the other hands, drought caused a significant decline (~25%) in annual soil respiration rate and CO2 emission (~26%) , with the significant difference occurring in growing seasons. Drought does not change the exponential relationship between soil respiration and temperature, but decreases the temperature sensitivity, and the correlation coefficient between soil respiration and temperature/moisture. Our findings should provide a better understanding of carbon sequestration potential and determination of how future climate change may impact carbon budgets.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2020
- Bibcode:
- 2020AGUFMGC0550003Z
- Keywords:
-
- 0478 Pollution: urban;
- regional and global;
- BIOGEOSCIENCES;
- 0480 Remote sensing;
- BIOGEOSCIENCES;
- 0486 Soils/pedology;
- BIOGEOSCIENCES;
- 1630 Impacts of global change;
- GLOBAL CHANGE