10.6084/m9.figshare.1011759.v1
Kun Huang
Kun
Huang
Shaoqiang Wang
Shaoqiang
Wang
Lei Zhou
Lei
Zhou
Huimin Wang
Huimin
Wang
Yunfen Liu
Yunfen
Liu
Fengting Yang
Fengting
Yang
Daily dynamics of CPC and CPC deficits at Qianyanzhou station from 2003 to 2010
IOP Publishing
2013
canopy photosynthetic capacity
eddy covariance flux data
climate extremes
Qianyanzhou station
productivity deficits
pcpc
forest ecosystem vulnerability
CPC deficits
Environmental Science
2013-07-23 00:00:00
Figure
https://iop.figshare.com/articles/figure/_Daily_dynamics_of_CPC_and_CPC_deficits_at_Qianyanzhou_station_from_2003_to_2010/1011759
<p><strong>Figure 1.</strong> Daily dynamics of CPC and CPC deficits at Qianyanzhou station from 2003 to 2010. Both the CPC curve (red line) and PCPC curve (black line) were algorithmically smoothed. The CPC deficits were the difference between the CPC and PCPC (blue area).</p> <p><strong>Abstract</strong></p> <p>Increasing occurrences of climate extreme events urge us to study their impacts on terrestrial carbon sequestration. Ecosystem potential productivity deficits could characterize such impacts and display the ecosystem vulnerability and resilience to the extremes in climate change, whereas few studies have analyzed the yearly dynamics of forest potential productivity deficits. Based on a perfect-deficit approach, we used <em>in situ</em> eddy covariance flux data and meteorological observation data at Qianyanzhou station from 2003 to 2010 to explore the relationship between potential productivity and climate extremes, such as droughts in 2003 and 2007, ice rain in 2005, and an ice storm in 2008. We found (1) the monthly canopy photosynthetic capacity (CPC) deficits could be mainly explained by air temperature (Ta) deficits (<em>R</em><sup>2</sup> = 0.45, <em>p</em> < 0.000 01); (2) a significant correlation was noted between seasonal CPC deficits and co-current Ta deficits (<em>R</em><sup>2</sup> = 0.45, <em>p</em> < 0.000 01), especially in winter (<em>R</em><sup>2</sup> = 0.79, <em>p</em> = 0.003); (3) drought in summer exerted a negatively lagged effect on potential productivity (<em>R</em><sup>2</sup> = 0.59, <em>p</em> = 0.02), but at a short time scale; and (4) annual CPC deficits captured the impacts of climate extremes on the forest ecosystem potential productivity, and the two largest potential productivity deficits occurred in 2003 (relative CPC deficits = 0.34) and in 2005 (relative CPC deficits = 0.35), respectively. With the perfect-deficit approach, the forest ecosystem vulnerability to extremes was analyzed in a novel way.</p>