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| 2023-09-20 11:48:06 | onclick： | Study on Structure and Hydrological Process of Key Belt in Southwest Karst Region |
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Karst accounts for about one third of China's land area, of which Southwest Karst is the largest exposed area of carbonic acid rock in the world.Carbonic acid rock has strong solubility, which can lead to shallow soil layer, underlying surface karst zone pipeline, fissure network, high spatial heterogeneity, complex and rapid hydrological process.
However, it is difficult to describe the thickness and complexity of soil-surface karst zone, which limits the understanding of the interaction mechanism between karst key zone and hydrological process.
Based on the observation platform of Karst Ecosystem Observatory, Chen Hongsong, a researcher at the Institute of Subtropical Agricultural Ecology, CAS, quantified the spatial distribution of soil-surface karst zone thickness.
Based on geophysical exploration techniques, the spatial distribution of soil and surface karst zone thickness in small watersheds and its influencing factors were quantified.The results show that the average soil thickness of the small watershed is much lower than that of the surface karst zone, and the spatial correlation between the two decreases with increasing altitude.Slopes account for 79 per cent of the total area of small watersheds, accounting for only 47 per cent of the soil volume, and the average thickness of soil and surface karst zones is much shallow than depressions.Topography, soil properties and vegetation types account for 63% of the total thickness of surface karst zone, of which soil thickness (21%), soil bulk weight (8%) and soil gravel content (6%).
At the same time, the vegetation types in Fengchong depression showed obvious slope differentiation, and the control effect of energy (solar radiation) on soil-surface karst zone temperature decreased with the decrease of altitude.Weathered intensity determines the overall hydrological and microenvironmental characteristics of peak-clump depression.The soil layer of strong weathering slope is thick, joint fissures develop, and the permeability of weak weathering slope is weak, but local pipe fissures develop and have priority flow characteristics.For each 1℃ change in ambient temperature, the temperature range of the surface karst zone on the soil surface of strong and weak weathering slope is ±0.28℃ and ±0.32℃, respectively.During the rainfall event, the cooling effect of the preferential flow development zone (weak weathering hillside) composed of pipe cracks is especially prominent.
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