Year: 2024
Type: article
Abstract: Ecosystem carbon flux components, including ecosystem gross primary productivity (GPP), ecosystem respiration (ER), and net ecosystem productivity (NEP), are the most direct indicators of ecosystem production capacity, carbon sequestration, and climate regulation strength. Nevertheless, little is known about how water availability affects the temperature responses of carbon flux components in water-limited ecosystems. Based on a long-term eddy observation dataset of temperate grasslands in northern China, we analyzed the effects of drought on the optimum temperature of carbon flux components ( T opt flux ) in temperate grassland ecosystems and clarified the relative contributions of vegetation and climate factors to T opt flux . We found that the optimum temperatures of carbon flux components were widespread across different grassland types, with a significant lower optimum temperature of NEP ( T opt NEP , 17.32 ± 3.21 °C) than that of GPP ( T opt GPP , 18.67 ± 2.53 °C) and ER ( T opt ER , 19.30 ± 1.94 °C). Drought significantly reduced T opt NEP , but had no significant effects on T opt GPP and T opt ER . Obvious shifts of occurrence date of T opt flux were also observed in the years with different precipitation regimes. That is, T opt
Source: Environmental Research Letters
Language: English
Subfield: Global and Planetary Change
Field: Environmental Science
Domain: Physical Sciences
SDG: Climate action
Open Access status: gold
Estimated APC paid: $2,820
OpenAlex ID: W4404591891