Dynamic traceability effects of soil moisture on the precipitation–vegetation association in drylands

•PRE-VI associations were greater in the Southern hemisphere drylands.•Moderate soil moisture enhanced the PRE-VI association in global dryland.•Decreased soil moisture weakened the PRE-VI association during 1982–2015. Vegetation growth is critical in characterizing ecosystem carbon sequestration. W...

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Bibliographic Details
Published in:Journal of hydrology (Amsterdam) 2022-12, Vol.615, p.128645, Article 128645
Main Authors: Zhao, Wei, Yu, Xiubo, Xu, Chengdong, Li, Shenggong, Wu, Genan, Yuan, Wenping
Format: Article
Language:English
Subjects:
Carbon uptake variability
Climate change
Drylands
Precipitation
Soil moisture
Vegetation index
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Summary:•PRE-VI associations were greater in the Southern hemisphere drylands.•Moderate soil moisture enhanced the PRE-VI association in global dryland.•Decreased soil moisture weakened the PRE-VI association during 1982–2015. Vegetation growth is critical in characterizing ecosystem carbon sequestration. Water availability profoundly affects the interaction between climate change and vegetation dynamics in drylands. However, the associations of the precipitation–vegetation index (PRE-VI) and temperature–vegetation index (TEM-VI) as well as whether and how the soil moisture modulates PRE-VI and TEM-VI are still unclear. Precipitation contributed substantially much more to vegetation dynamics than temperature, and PRE-VI associations were greater in the Southern Hemisphere than those in the Northern Hemisphere in global drylands. The traceability effects of soil moisture on PRE-VI and TEM-VI were investigated, and a convex shape was observed for PRE-VI as soil moisture increased, but not significant trend for TEM-VI. It showed that moderate soil moisture enhanced PRE-VI associations through the maintenance of reasonable surface–atmosphere feedback to counteract the balance of plant growth and energy collocation. In the past three decades, PRE-VI associations decreased with the increase in soil moisture, suggesting the consistency of the spatial and temporal pattern of the effect of soil moisture on PRE-VI associations in water-limited ecosystems. Our results implied that changes in soil moisture reflect changes in climate–vegetation associations and can guide nature-based solutions to improve ecosystem carbon sink.
ISSN:0022-1694
1879-2707
DOI:10.1016/j.jhydrol.2022.128645