Effects of extreme drought on CO2 fluxes of Zoige alpine peatland

doi:10.7523/j.issn.2095-6134.2017.04.008

Abstract

Abstract: To study the effects of extreme drought on net ecosystem CO₂ exchange (NEE), ecosystem respiration (R_e), and gross primary productivity (GPP) of Zoige alpine peatland, the carbon fluxes in both extreme drought treatment (D) and control treatment (CK) were monitored by using static enclosed chamber technique in a control platform of extreme climate event. The results showed that extreme drought significantly decreased NEE, R_e, and GPP (P<0.05) of Zoige alpine peatland and hence reduced the carbon fixation capacity of targeted ecosystem. We also found that temperatures (air temperature (T_a) and soil temperature (T_s)) and soil water content (SWC) were the main driving factors of carbon budget dynamics in Zoige alpine peatland. NEE, R_e, and GPP were significantly positively correlated with air temperature (P < 0.05), and their sensitivity to the T_a change was weakened by extreme drought. The correlations of NEE, R_e, and GPP with topsoil temperature were much stronger than those with subsoil temperature. Besides, we found that extreme drought reduced the sensitivity of NEE to soil temperature at depth of 5 cm, but strengthened the sensitivity of R_e. Furthermore, NEE, R_e, and GPP were significantly positively correlated with soil water content (P<0.05). However, extreme drought had no significant effect on soil total carbon, nitrogen, and soil organic carbon contents (P>0.05).

Key words: extreme drought, peatland, carbon fluxes, temperature, soil water content

CLC Number:

ZHANG Yuan, HAO Yanbin, CUI Lijuan, LI Wei, ZHANG Xiaodong, ZHANG Manyin, LI Linfeng, YANG Si, KANG Xiaoming. Effects of extreme drought on CO₂ fluxes of Zoige alpine peatland[J]. , 2017, 34(4): 462-470.

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Effects of extreme drought on CO₂ fluxes of Zoige alpine peatland

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