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Overgrazing is one of the main causes of desertification in the semiarid Horqin sandy grassland of northern China. Excluding grazing livestock is considered as an alternative to restore vegetation in degraded sandy grassland in this region. However, few data are available concerning the impacts of continuous grazing and livestock exclusion on soil properties. In this paper, characteristics of vegetation...
Measuring soil loss is costly, must cover a range of field situations, is not standardized, and is season dependent. In addition, use of sparse soil loss data (from other studies) compromises the integrity of many erosion models. Easily assessable soil erosion indicators to monitor the cumulative effect of erosion between tillage/weeding and harvesting called eroding clods, flow surfaces, pre-rills,...
Soil surface roughness may significantly impact runoff and erosion under rainfall. A common perception is that runoff and erosion are decreased as a function of roughness because of surface ponding and increased hydraulic roughness that reduces effective flow shear stress. The objective of this study was to measure the effects of initial surface roughness on runoff and erosion under controlled laboratory...
A closed depression (CD) is a landform where the hillslopes encircle a common sediment depository, and the sediment eroded from the surrounding hillslopes is trapped in the system. Despite the fact that closed depressions (CDs) have been regularly reported in the literature, little research on their origin exists. Therefore, a case study was made of the morphological characteristics and genesis of...
This paper uses a number of particle structural characterizations and behavioral assessments in an attempt to differentiate flocs formed in the water column from water stable soil aggregates formed in the terrestrial environment but transported to a river by overland flow. Using discrete populations of flocs and soil aggregates, the study successfully illustrated differences in floc structure (as...
Studies were conducted for 8 years to determine the effect of fire on solute losses from abandoned fields found on the slopes of the Pyrenees Mountains in Spain. Solute release played a key role in loss of materials from eroding slopes and may account for up to 60% of these losses. The objective of the research was to examine long-term solute losses caused by fire that occurred during the first month...
This paper reports the results of a study on how fire effects water and sediment losses in the Central Spanish Pyrenees where land abandonment results in an increase of the scrubland and fire-affected surfaces. In 1991, two plots (control and burnt) were installed to collect runoff, suspended sediments and solutes. One of the plots was burnt (burnt-1) and the other was covered by shrubs and herbs...
The lower Tordera River is a representative case of water and sediment dynamics and uses in a large river in the Western Mediterranean region. Along the study reach, the fluvial regime of the river changes, shifting from a perennial water and sediment circulation in the upper parts to an ephemeral flow pattern in the lower sections. The fluvial sediment budget of the lower Tordera was estimated based...
The study focuses on the formation processes of the uprivermost (Jingjiang reach) of three anastomosing river reaches along the middle Yangtze River, downstream of the Three Gorges Dam site and 1700 km upriver from the seacoast at Shanghai in southern China. The Jingjiang reach consists of large anastomosing channels: the Songzi, Hudu, Anxiang and Ouchi rivers, which depart from the Yangtze trunk...
We adapted a digital image analysis procedure to extract multispectral data from sequential colour air photos of a Lake Huron sand dune system and then classify land cover into water, sand, and vegetation. We isolated portions containing individual blowouts from georeferenced land cover maps of the dune system in 1973 and 1998 and overlaid the sequential images using geographic information systems...
Mexico City is built on the sediments of the former Texcoco lake (Ex-Lago de Texcoco), which are characterised by the presence of a siliceous deposit, up to 70 m in thickness, called “jaboncillo” (like soap).The jaboncillo is composed dominantly of amorphous silica and iron oxides and hydroxides, with minor amounts of phyllosilicates and detrital volcanic minerals. The mineralogy, the micromorphology...
Although it is well known that ephemeral gully erosion is a process of a recurrent nature and its contribution to total sediment production is far from negligible, there is a gap in the assessment of changes that the ephemeral gullying cycle produces in the fields' landscape and in the general economic balance of farms (the cost of erosion). The present paper applies a method for assessing the topographic...
The chemical, mineral, physical, and mechanical properties of two soil layers on soil-slip scars in slopes underlain by coarse-grained granite and fine-grained granitic gneiss near Seoul, Republic of Korea, were examined. Our aim is to study the effect of the mineral grain size of the bedrock on the soil layer structure and the return period of shallow soil slips. Because of the coarser slope materials...
Salt-affected soils differ in their chemical properties to all other soils. Sodicity and salinity may affect the soil organic matter component of these soils. In a field experiment, we investigated organic matter decomposition in nonsaline nonsodic Aquic Argiudoll, a nonsaline sodic Typic Natraquoll, nonsaline nonsodic Petrocalcic Paleudoll and a saline sodic Typic Natralboll in the Pampa Deprimida,...
Archaeological excavations and environment–archaeology studies over many years in the Yangtze Delta region have provided exceptional information about climatic variations, growth and demise of human civilization and human–environment interactions. The archaeological excavations show that the cultural layers of the Neolithic sites are interrupted by barren layers without any cultural relics (so-called...
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