#8110. Decreased precipitation in the late growing season weakens an ecosystem carbon sink in a semi-arid grassland

October 2026publication date
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Journal’s subject area:
Ecology;
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Abstract:
Net ecosystem gas exchange (NEE), a balance between gross ecosystem primary productivity (GPP) and ecosystem respiration (ER), is an important indicator of terrestrial ecosystem CO2 sink or source. Increasing frequency in droughts during different periods of the growing season may affect terrestrial ecosystem carbon (C) balance. However, detecting how drought timing controls ecosystem C processes is insufficiently explored because it is a challenge to accurately monitor and forecast drought dynamics. In a 5-year (20XX–20XX) precipitation manipulation experiment in a temperate steppe in northern China, we imposed a 60% decrease in precipitation in the early (April–June) and late (July–September) growing seasons in plots under rainout shelters to simulate drought occurrence timing.
Keywords:
carbon processes; carbon sink; climate change; decreased precipitation; drought timing; photosynthetic substrate; plant community cover; semi-arid steppe

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