Comparison of soil moisture at different depths for drought monitoring based on improved soil moisture anomaly percentage index

Xu, Zhengguang; Wu, Zhiyong; He, Honglin; Xiao, Guo; Zhang, Yuliang

doi:10.1016/j.wse.2021.08.008

Cited by 21 publications

(9 citation statements)

References 31 publications

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“…This resulted in many low VPD observations that were rather indifferent to LUE g , though nonetheless some high VPD days occurred that restricted stomatal conductance. The wet growing season probably also explains the relatively low importance of SWC, which reacts slower to dry periods with increasing depth (Xu et al., 2021). In comparison, for a drought‐affected tropical dry forest, a high importance of VPD and latent heat flux to explain GPP was detected by Castro et al.…”

Section: Discussionmentioning

confidence: 99%

Environmental Drivers of Gross Primary Productivity and Light Use Efficiency of a Temperate Spruce Forest

Reitz

Bogena

Neuwirth³

et al. 2023

JGR Biogeosciences

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The gross primary productivity (GPP) of terrestrial ecosystems, of which forests are the dominant factor (Pan et al., 2011), is a key element of the global carbon cycle (Canadell et al., 2021). The resulting biomass further is important for human demands of food, energy, and construction materials (Taye et al., 2021). The assimilation of atmospheric CO 2 via photosynthesis is primarily driven by photosynthetically active radiation (PAR), though it is also sensitive to intertwined environmental and physiological variables, such as temperature, water, and nutrient availability, or chlorophyll content of the canopy (

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Section: Discussionmentioning

confidence: 99%

Environmental Drivers of Gross Primary Productivity and Light Use Efficiency of a Temperate Spruce Forest

Reitz

Bogena

Neuwirth³

et al. 2023

JGR Biogeosciences

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“…Therefore, ecosystems can quickly return to their normal state once rewetted (Nguyen et al., 2017; S. Zhang et al., 2021). Compared with drylands, humid regions had higher water availability, more complex structures and higher biodiversity, and resisted drought by drawing soil moisture at different depths and the heterogeneous responses to drought among individuals (D. Liu et al., 2022; Z. Xu et al., 2021).…”

Section: Discussionmentioning

confidence: 99%

“…different depths and the heterogeneous responses to drought among individuals (D. Liu et al, 2022;Z. Xu et al, 2021).…”

Section: The Tradeoff Between Resistance and Resilience Among Differe...mentioning

confidence: 99%

Declining Tradeoff Between Resistance and Resilience of Ecosystems to Drought

Yao,

Liu,

Song

et al. 2024

Earth's Future

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Resistance and resilience are widely used to characterize ecosystem drought stability. Tradeoff between resistance and resilience have been reported, but its long‐term trends remain uncertain at global scale. Based on remotely sensed vegetation indices, we assessed the spatiotemporal dynamics of drought resistance and resilience. Result revealed that there was a significant decline in the tradeoff between resistance and resilience, corresponding to a substantial increase in the proportion of areas with high resistance‐high resilience or low resistance‐low resilience. In the South Sahel, South Africa and Central China, the increased precipitation and vegetation coverage contribute to enhanced drought stability constructed by resistance and resilience; while rising temperature, decreased water availability and deforestation lead to declined stability in northeastern North America, South America and the Congo region. Increases in the areas with low resistance‐low resilience resulting from declining tradeoffs warn of increased regional ecosystem vulnerability.

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“…There are rare studies attempting to uncover the process and mechanisms of meteorological drought to soil drought at different soil depths. However, soil moisture at different depths affects distinct processes of the watercarbon cycle; for example, the surface, root-zone and deep soil moisture are closely associated with overland flow, vegetation growth, and groundwater recharge, respectively (Xu et al 2021b. Consequently, the moisture and heat transfer process in different soil layers may also be constrained by distinct physical processes that affect the atmosphere-land water balance.…”

Section: Introductionmentioning

confidence: 99%

Precipitation exacerbates spatial heterogeneity in the propagation time of meteorological drought to soil drought with increasing soil depth

Hu,

Xia,

She

et al. 2024

Environ. Res. Lett.

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The propagation of meteorological droughts to soil droughts poses a substantial threat to water resources, agricultural production, and social systems. Understanding drought propagation process is crucial for early warning and mitigation, but mechanisms of the propagation from meteorological drought to soil drought, particularly at varying soil depths, remain insufficiently understood. Here, we employ the maximum correlation coefficient method and the random forest model to investigate the spatiotemporal patterns and drivers of propagation time (PT) from meteorological drought to soil drought at four different depths across China from 1980 to 2018. Our findings reveal consistently higher PT in northern China and lower PT in southern China across varying soil depths, with more pronounced spatial heterogeneity with increasing soil depth. Furthermore, we identify temperature and precipitation as determinants of spatial patterns of PT in surface and deeper soil layers, respectively. Additionally, precipitation emerges as the dominant factor influencing changes in PT between different soil layers. Our study highlights a discernible shift in PT drivers from temperature to precipitation as soil depth increases and the significant impact of precipitation on exacerbating spatial heterogeneity in PT. This study contributes to an enhanced comprehension of the propagation process from meteorological drought to soil drought at different depths, which can aid in establishing practical drought mitigation measures and early warning systems.

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Comparison of soil moisture at different depths for drought monitoring based on improved soil moisture anomaly percentage index

Cited by 21 publications

References 31 publications

Environmental Drivers of Gross Primary Productivity and Light Use Efficiency of a Temperate Spruce Forest

Environmental Drivers of Gross Primary Productivity and Light Use Efficiency of a Temperate Spruce Forest

Declining Tradeoff Between Resistance and Resilience of Ecosystems to Drought

Precipitation exacerbates spatial heterogeneity in the propagation time of meteorological drought to soil drought with increasing soil depth

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