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Ephemeral streams are morphological elements of karstic low-relief areas, characterized by relatively large and flat transects, which occasionally drain runoff, in particular when generated by extraordinary or extreme rainfall events. The main problem related to this streams and affecting the analysis and prediction of flood events in karst semi-arid regions is the almost complete absence of discharge...
Land use change is one of the major factors that affect soil organic carbon (SOC) variation and global carbon balance. Since the late 1970s, a significant area of the hilly Loess Plateau has undergone major land use changes during several revegetation programs, especially in the Grain for Green Project. However, so far there has not been a comprehensive study to determine temporal and spatial variations...
Agricultural land is a complex system that combines natural ecology and social economy, and the health of agricultural land directly influences regional economic development and national food security. Emergy analysis is an effective method for value analysis of ecosystems, assessment of the health of ecosystems, which is based on principles of systems ecology and energy. And fuzzy logic is a generalization...
In this study, two separate landslide susceptibility maps using multi-temporal landslide and Wenchuan earthquake triggered landslide datasets were carried out based on GIS and logistic regression model at Zhouqu segment in the Bailongjiang Basin in North-western China. This region has already been strongly affected by landslides for a long time, and numerous additional slope failures were triggered...
The organic soil layer (0–35cm) of seventeen sites under high altitude rocky complexes (HARC) was sampled in eastern Brazil to evaluate the relationship of vegetation type and carbon and nitrogen isotopic composition of bulk soil and humic acid (HA). The δ 13 C and δ 15 N values obtained for bulk soil and for AH (extracted with NaOH 0.1molL −1 ) were not statistically different...
We investigated soil samples of four burnt slopes in the Tyrolean Limestone Alps of varying age after fire (wildfires occurred in 2003, 1962, 1946, and in 1250AD) as well as of the surrounding soils that were not affected by combustion. Charcoal content of the O and A horizons was determined as well as pH, soil organic matter content and C/N ratio. The results showed a background value of charcoal...
Due to particular soil and climate conditions and inappropriate agricultural practices, Aragon (NE Spain) is a region prone to land degradation by water erosion. For this reason, the adoption of conservation tillage systems has been encouraged as an alternative to preserve soil and water in this region. However, little information concerning soils on which these techniques are applied is available...
This paper analyzes runoff and soil loss in relation to the rainfall regimes and land use changes in a small mountainous watershed in the Three Gorges Area (TGA) of China. Based on 10years of rainfall measurements and K-means clustering, 152 rainfall events were classified into three rainfall regimes. The mean statistical features of different rainfall regimes display a marked difference. Rainfall...
This study analyses the loss of fertility in eroded soils, whose nutrients are retained behind check dams. The study was carried out in the basin of the River Quipar, which flows into the River Segura (SE Spain). In two projects carried out in 1962 and 1996, 425 check dams were constructed in an attempt to reduce sedimentation. Of these check dams, 18 were chosen as representative of the different...
Fragipan horizon is a natural, subsurface soil layer exhibiting higher bulk density and lower porosity in comparison with the overlying horizons significantly restricting infiltration of water and root penetration. In contrast to hard and cemented horizons (e.g. duripan), clods of the fragipan horizon (Btx) slake or fracture immediately when placed in water. The most interesting issue concerning genesis...
Vesicular structure is a widespread feature of soils in arid environments. Typically associated with stone pavements, it has a major control function for dust and water fluxes and, hence, for site ecology. Previous models of vesicular structure formation and stability are inconsistent and mostly focused on the investigation of isolated control parameters. To test existing models, to infer plausible...
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