CLIMATE WARMING IMPACTS ON CARBON CYCLING IN TERRESTRIAL ECOSYSTEMS

doi:10.17521/cjpe.2007.0023

Abstract

Abstract:

Climate warming is one key issue of global change and plays an important role on carbon cycling in terrestrial ecosystems. This paper reviews the recent advance in our understanding of global warming and its impacts on terrestrial carbon cycling and underlying mechanisms. We also discuss the state-of-the art in ecosystem modeling and its applications to ecosystem assessment. Climate warming will influence terrestrial carbon cycling in several aspects: 1) net primary productivity (NPP) will decrease in low-latitude region, and increase in mid- and high-latitude zones, totally show an increase on the global scale; 2) soil respiration will increase at the initial stage and then keep relatively stable because of biotic adaptability; 3) plant carbon storage will increase in high-latitude region, and remain stable or even decrease in low-latitude zone, and show a slight increase on the global level; 4) the production and decomposition rate of litterfall will increase; 5) the decomposition rate of soil organic carbon will increase and thus decrease soil carbon stock, meanwhile, soil carbon stock will increase for more carbon input from plant litter. These two processes will trade off in certain degree, resulting in different results for varied ecosystems. On the global scale, soil carbon stock will show a decrease; 6) although the different performances of diverse ecosystems, the global terrestrial ecosystem acts as a weak carbon source. Biophysical, biogeographical and biogeochemical models were developed in the past decades for global change research. In the future research, there are an urgent need to address the interaction among climate warming and other factors including elevated CO₂, O₃, drought, fire disturbance. The big challenge we are facing is how to deal with the complexity with multi-factors and multi-scales by using experimental and modeling approaches.

Key words: climate warming, terrestrial ecosystem, carbon cycling, ecosystem model

XU Xiao-Feng, TIAN Han-Qin, WAN Shi-Qiang. CLIMATE WARMING IMPACTS ON CARBON CYCLING IN TERRESTRIAL ECOSYSTEMS[J]. Chin J Plant Ecol, 2007, 31(2): 175-188.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2007.0023

https://www.plant-ecology.com/EN/Y2007/V31/I2/175

Figures/Tables 4

Fig.1 Global average temperature of the past millennium(Crowley, 2000)

Fig.2 Climatic warming impact on carbon cycling in terrestrial ecosystems

Fig.3 Relationship between net primary production (NPP) and soil respiration (Rh) (Tian et al.,1998b)

Fig.4 Mechanism of climatic warming impact on carbon budget in terrestrial ecosystems ①Climatic warming enhances photosynthesis (Braswell et al. 1997;Petchey et al. 1999; Vukicevic et al. 2001) ②Climatic warming increases SOM decomposition rate (Chen et al. 2001) ③Climatic warming increases PET (Xiao et al. 1996) ④Climatic warming increases respiration (Tian et al. 1998b, 2003; Vukicevic et al. 2001) ⑤The decomposition of SOM increases available nitrogen in soil (Xiao et al. 1996;Lukewille & Wright, 1997; Ineson et al. 1998) ⑥The increasing PET leads to water deficiency (Xiao et al. 1996) ⑦More available nitrogen stimulates plant growth (Xiao et al. 1996; Schimel et al. 1997; Melillo et al. 1993, 2002) ⑧Water stress inhibits plant growth (Tian et al. 1998b; Tezara et al. 1999; Barber et al. 2000) ⑨Increasing photosynthesis increases NEP (Braswell et al. 1997;Petchey et al. 1999) ⑩Increasing respiration decreases NEP (Tian et al. 1998b; Vukicevic et al. 2001)

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