Hydraulic Properties of a Rock‐Soil‐Root System: Insights From Fraxinus ornus L. Saplings Growing on Different Carbonate Rocks
Sara Di BertMartina TomasellaPatrick DuddekSara NataleFrancesco PetruzzellisAndrea CarminatiLuca ZiniLorenzo D'AmicoGiuliana TrombaAndrea Nardini
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ABSTRACT Drought impacts trees in varied temporal and spatial patterns, suggesting that heterogeneity of below‐ground water stores influences the fate of trees under water stress. Karst ecosystems rely on shallow soil overlying bedrock that can store available water in primary pores. A contribution of rock moisture to tree water status has been previously demonstrated, but actual mechanisms and rates of rock‐to‐root water delivery remain unknown. We report accurate measurements of hydraulic properties of two rock types (Breccia and Dolostone), of typical Karst red soil, and of roots of a common Karst tree species grown under different rock‐soil combinations. Experimental data were used to build a water exchange model that supported the hypothesis that roots can extract water from porous and highly conductive rocks (Breccia), but not from more compact ones (Dolostone), especially when plants grow in rocky substrate or experience water stress, and thus have low root hydraulic conductivity and low rates of water extraction from rocks. Our data support the hypothesis that rocks represent important water stores for plants growing in rock‐dominated habitats. Heterogeneous rock properties translate into different rates of water delivery to root systems, underlying complex patterns of tree mortality under severe drought stress.Keywords:
Dolostone
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Based on the geological exploration in the first and second railways of Xi'an to Ankang,the paper discussed the geological characteristics of karst phenomenon in the construction in the marine deposit extremely thick carbonate rock layer of carboniferous,Devonian and cambrian-ordovician,which developed in the hinterland of southern Qinling.According to the karst development degree and configuration revealed in the existing engineering construction,the karst was divided into vertical seepage karst zone and undersurface flow karst zone;and on this basis,it was put forward that different construction measures was applied for each karst type and part.
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Abstract In the western Lungu area in the Tarim Basin, dissolution pores, holes and fractures served as reservoir space in the Ordovician carbonate rocks. The karst reservoirs had a strong heterogeneity, and were classified into four types, including fracture, hole, fracture - hole, and cave. In different landscape units, the karsted fracture and hole system was vertically zoned. The mechanism of karst was studied with sheet analysis, and a developmentmodel of the karst reservoir in the Ordovician western Lungu carbonate rocks was established. The Lungu7 block in the east was the highest in the study area, and recharged the buried hills in Lunnan. The karst platform in the western Lungu area recharged the western Lungu area. Meteoric water infiltrated, forming dissolution pores and fractures, which were filled by clays and calcites. On the karst slope, groundwater migrated horizontally, and a karst river/pipeline system developed, filled by karst breccias and clays. The karst basin drainage area determined the scale of karst development.
Tarim basin
Breccia
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Outcrop
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Abstract Karst is one of the geological manifestations that form different earth shapes and scenic landscapes. Which are generally divided into surface landscapes that are important its sinkhole and the sub-surface landscapes. The research aims to compare the manifestations of karst for the study area and the typical karst (holocaust) areas in the world. The most important of which are the caves, which result from the process of dissolution the rocks of all kinds, But the most important rocks formed for karst carbon rocks, especially limestone rock, due to its abundant and moderate solubility. add to evaporated rocks, especially gypsum, come second in the form of karst manifestations. There are several surface landscapes karst forms in the Western Desert such as a Solution and Collapse Sinkhole and subsurface landscapes karst such as cavities formed from carbonate and gypsum rocks. Landscapes karst distribution in variable shapes and dimensions on surfaces of the plateaus on Zor Hauran, Ubaid, Hussainiyat, Amij, Dammam, Umm Er Radhuma, Russ, and Ms`ad within Euphrates Fatha and Zahra formations, which belongs to Mesozoic and Cenozoic eras times. The meaning of the non-typical karst is that the surface karst forms such as (Sinkholes) and the subsurface karst forms such as (cavities) are few in number in addition to the size, depth and dimensions of these phenomena are small compared to the typical karst forms, which are characterized by the abundance of their numbers in addition to the huge size of these karst phenomena. There are a number of reasons and observations that make this phenomenon unclear and not typical for the study area because of Lithology, geomorphology, tectonic, and climatic reasons. In addition to the time factor, which has a main role in the development of karst. The type of karst in Iraq belongs to the arid and semi-arid karst group depending on classification of karst assemblages according to climate.
Sinkhole
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Contact karst is a type of karst formed where allogenic waters from the surface influence the karst geomorphic system. Contact karst may be considered in both a strict sense and in a wide sense. In a strict sense, contact karst is the karst phenomena and forms influenced by the contact between a karstifiable rock and a non-karstifiable rock. In a wide sense, contact karst may also be the karst phenomena and forms influenced by the contact between two different karstifiable rocks, for example limestone and dolomite. This thesis focuses on the geomorphological characteristics of contact karst on limestone-dolomite contacts in Slovenia. The purpose of the research was to determine which processes contribute to the development of contact karst on the contact between limestone and dolomite, to define their dynamics, and to identify which surface and underground landforms are developed.
The spatial distribution of contacts between limestone and dolomite in Slovenia was determined in a GIS. Using existing lithological data as a data layer, the extent of carbonate rock cover in Slovenia was calculated. Carbonate rocks cover 47 % of Slovenia’s territory (27 % limestone, 14 % dolomite, and 6 % clastic carbonate or impure carbonate rocks). And, there are 1,353 limestone-dolomite contact lines in the country, totalling a length of 2,625 km.
Study areas were selected based on GIS analysis of the limestone-dolomite contacts. A total of 17 areas in Slovenia were studied in detail. Fieldwork at the study areas consisted of the collection and analysis of rock, sediment, and water samples, allowing each study area to be geomorphologically mapped.
General factors contributing to contact karst development on the lithological contact between limestone and dolomite were determined. The most important factor appears to be the characteristics of the inflow part, formed on the dolomite. Where dolomite functions as a karst rock, the water is dispersedly drained into the karst. In that case, the limestone-dolomite contact does not function as contact karst. Alternatively, where the dolomite functions as fluviokarst, a point recharge, or sinking stream, is formed. In that case, contact karst may be formed. The fluviokarstic character of the dolomite depends on its chemical and mechanical properties. The dolomite bedrock must be positioned at a higher elevation than the neighbouring limestone bedrock. To meet this requirement, dolomite beds, which in Slovenia are generally older than limestone and hence stratigraphically positioned below the limestone beds, need to be positioned above limestone by either folding that leads to inverse stratification, overthrusting, or by displacement along faults. Along faults, the dolomite is more prone to mechanical weathering due to tectonic crushing in addition to its chemical properties. Hence, contact karst is more likely to form at thrust contacts between thrust limestone and dolomite. Limestone-dolomite contact karst develops predominately at higher elevations due to increased precipitation (where allogenic inflow is higher) and greater frost action due to lower temperatures. Intense mechanical weathering of dolomite over limestone directly affects contact karst processes and significantly contributes to the spatial distribution of these types of surfaces. The location of the water table close to the surface is also a leading factor in limestone-dolomite contact karst formation due to enhanced border corrosion.
Landforms typical of contact karst were identified in the study areas during geomorphological analyses. However, they are not as clearly recognizable as those on contact between carbonate and non-carbonate rocks. The reason for this is the fact that allogenic waters from dolomitic catchment areas are by far not as corrosive as those from non-carbonate catchment areas.
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The current research on the dissolution of carbonate rocks in the Karst of Trieste indicates that the average degradation of surfaces exposed to atmospheric agents is 0.028 mm/year with an average rainfall of 1350 mm. The maximum levels (0.031 mm/year) correspond to micro-crystalline limestones, the minimum values (0.014 mm/year) to dolomites.
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Lithology
Mineral resource classification
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Albania is one of the most karst-developed countries in Europe. Karst phenomena are related to soluted carbonate formations which cover of about 7300 km2 of Albanian territory and with sulfate evaporates rocks, which outcrop of about 500 km2. Typically alpine relief of average altitude 708 m above the sea level and high horizontal splitting are favorable for karst development. Karst and geological sites of karst origin are widespread mainly in Albanian Alps and in Ionian zone. In Albanides there are determined surfaces and underground karst forms which belong to the Neo-Pliocene-Quaternary age and deep karst forms belonging to the paleokarst in old formations. The most widespread karst forms in carbonate rocks there are valleys, caves, cones etc., while into salt rocks there are formed many karstic lakes and depressions. Up to now there are determined about 80 karstic caves, nice karst fields, valleys, plains, which represent geological sites of karst origin.
Outcrop
Sinkhole
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