Spatial pattern of land use types and their driving mechanism of watershed lagged effect in Karst drainage basin, Central Guizhou of China

Zhonghua He (), Shan Pan, Cuiwei Zhao, Hong Liang and Zhaohui Yang
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Zhonghua He: Guizhou Normal University
Shan Pan: Guizhou Normal University
Cuiwei Zhao: Guizhou Normal University
Hong Liang: Guizhou Normal University
Zhaohui Yang: Department of Emergency Management of Guizhou Province

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2024, vol. 120, issue 3, No 16, 2529-2551

Abstract: Abstract The occurrence of drought indicates that there is no rainfall or little rainfall within a certain period. Nevertheless, no or little rainfall within a certain time implies that drought may not happen. The drought occurrence in different regions or seasons shows a certain lag to some extent. The lag time and intensity (i.e., the contribution rate of rainfall in previous period to runoff in current period) are deeply affected by watershed water storage capacity. Subsequently, rainfall deficit is a necessary and insufficient for the droughts. To reveal the mechanism of watershed lagged effects and the impact of human activities on droughts, the characteristics of lagged effects and human activities in Central Guizhou of China are analyzed by the Lagged index and Landscape index based on land use data, rainfall and runoff data during the period 1971–2016. The results demonstrate that the impact of the same land use type in different ages (1970s–2010s) on watershed lagged intensity has a significant difference (P water body > cultivated land > construction land > woodland. As a subsequence, this study enriches the research content of landscape ecology, and it provides a theoretical basis for revealing the mechanism of agricultural and hydrological droughts in Karst drainage basins.

Keywords: Lagged effect; Watershed water storage; Human activities; Karst drainage basin (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1007/s11069-023-06292-4

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