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• W2802149346 abstract "Mass mortality of shrubs, especially the Noaea mucronata species, has been observed in the semi-arid Negev of Israel since the early twenty-first century. This has followed a long-term drought episode, and suggests a hysteresis-like effect. However, recent studies have revealed that the mortality has been varied across the region. Therefore, we assessed the depth and stoniness of the soil profile, in homogeneous and heterogeneous hillslopes. Then, we studied the volumetric moisture content during two consecutive growing seasons, in the topsoil of shrubby patches and of inter-shrub spaces in these hillslopes. The study shows that geodiversity – characterized by shallow soil, a high content of stones in the soil, and a high cover of rock fragment on the surface – reduced shrub mortality. This was attributed to the soil moisture content, which was considerably greater in the heterogeneous hillslopes, than that in the homogeneous hillslopes. It is proposed that the shallow soil halted the growth of herbaceous vegetation in the inter-shrub spaces of the heterogeneous hillslopes. Therefore, under rainstorms, this hillslope configuration results in considerable generation of overland water flow in the inter-shrub spaces. The water accumulates in the shrubby patches, allowing them to thrive, even during long-term dry episodes. In hillslopes with a deep soil layer, no stoniness in the soil profile, and no cover of rock fragments, the herbaceous vegetation is well developed, covering a considerable share of the inter-shrub spaces. This negates runoff formation and source–sink relations, limiting water availability for the shrubs, and resulting in their mass mortality. Despite no direct pastoral value for livestock, the shrubs play an important role in overall ecosystem functioning. This is due to their capacity to transect hydraulic connectivity, and negate ecosystem collapse. We propose a conceptual model for demonstrating the role played by geodiversity in alleviating drought stress in drylands. Copyright © 2018 John Wiley & Sons, Ltd." @default.
• W2802149346 created "2018-05-17" @default.
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• W2802149346 date "2018-05-25" @default.
• W2802149346 modified "2023-09-26" @default.
• W2802149346 title "Geodiversity decreases shrub mortality and increases ecosystem tolerance to droughts and climate change" @default.
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• W2802149346 doi "https://doi.org/10.1002/esp.4412" @default.
• W2802149346 hasPublicationYear "2018" @default.
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