Nutrient transport associated with water erosion : progress and prospect
Ecosystem ; Human impact ; Land use ; Nutrient ; Runoff ; Sediment transport ; Soil erosion ; Soil properties ; Water erosion
This paper gives a synthetic analysis of the nutrient transport process driven by water erosion from the important respects of the process including nutrient sources, the trigger of the carrier and the forms of nutrient transport, and the factors
regulating the nutrient transport. Finally, the major challenges in nutrient transport research are discussed and some potential resolutions are suggested.
This paper explores the soil nutrient pools of 14 young dry grasslands and compares them to the nutrient pools on heathlands, forested and agricultural land. On 2 sites, the plant species composition is compared to characteristic species for the EU
Habitats Directive in Denmark and the relationship between soil nutrient pools and underground biomass development is investigated. Root density was high in this study and soil nutrient content appeared to be an important parameter determining root
Nutrient relationships of greek lakes: water eutrophication monitoring, assessment and forecasting
Correlation ; Eutrophication ; Forecast ; Greece ; Hydrochemistry ; Lake ; Model ; Multiple regression ; Nutrient
In this study an attempt is made to present the relationships that describe the co-effects of the various nutrients, the abiotic factors and lake morphology for Greek lakes.
Soil nutrients in eroded granitic areas of south China
The AA. try to assess the nutrient status of the soils, both in the upland and the lowland areas, to examine the nutrient losses, and to determine needs for the improvement of agricultural soil fertility. Results from this study may broaden
of macrophyte growth on instream nutrient dynamics is discussed as an illustration of the potential for macrophytes to affect fluvial system functioning.
The main objective in this work has been to develop load models/load diagrams for coastal areas where the environmental effect of nutrient discharges in general, and from fish farms in particular, can be related to the dose of nutrients (nitrogen
and/or phosphorus) together with the sensitivity of the area. One hypothesis is that different coastal areas have different sensitivities to one and the same dose of nutrients and that this sensitivity is determined mainly by the coastal morphometry, water turnover
Nutrient losses by wind and water, measurements and modelling
Africa ; Biogeochemistry ; Burkina ; Model ; Nutrient ; Sahel ; Sediment budget ; Soil erosion ; Water erosion ; Watershed ; Wind erosion
Two physically based models (WEPS and EUROSEM, both written in PCRaster) were extended with nutrient modules to investigate the role of wind and water erosion in the loss and gain of nutrients at the scale of a Sahelian field. The models are applied
Nutrient losses in eroded sediment after fire in eucalyptus and pine forests in the wet Mediterranean environment of northern Portugal
Biogeography ; Eucalyptus ; Forest ; Forest fire ; Mediterranean climate ; Nutrient ; Pine ; Portugal ; Precipitation ; Soil erosion
The AA. consider the magnitude and duration of enhanced nutrient losses in particulate matter from newly burnt Eucalyptus globulus and Pinus pinaster forests in the Águeda River Basin, wet mediterranean climate of north-central Portugal
. The nutrients studied were total nitrogen (N), exchangeable potassium (K) and available phosphorus (P). They also consider post-fire changes in nutrient losses in relation to rainfall characteristics, and assess the impact of erosion on the nutrient status
Impacts of urbanization on topsoil nutrient balances - a case study at a provincial scale from Fujian, China
Agricultural land use ; China ; Cultivated land ; Environmental management ; Fujian ; Nutrient ; Soil ; Soil properties ; Urbanization
In Fujian province, the change in crop spectrum and land use by urbanization has resulted in 2 extreme trends in topsoil : nutrient depletion in grain-dominated regions and nutrient overloads in city suburbs. The rapid changes in land use and crop
spectrum caused by urbanization therefore created a challenge to the traditional soil nutrient management derived mainly from paddy fields and an urgent need for new management schemes in the province. The study provides valuable insights into nutrient
Exploring potential spatial-temporal links between fluvial geomorphology and nutrient-periphyton dynamics in streams using simulation models
Biogeochemistry ; Biomass ; Channel geometry ; Ecosystem ; Model ; Nutrient ; Population dynamics ; River bed ; Stream ; United States of America ; Wisconsin
Using a nutrient retention and periphyton growth model coupled to a dynamic geomorphic template, the AA. explore the potential role of channel shape, slope, and sediment texture on downstream nutrient retention, and attempt to determine if physical
changes alone can drive or influence changes in nutrient-periphyton dynamics. The overall model results suggest there is a strong potential control of both nutrient retention and periphyton biomass by channel morphology.
Changes in soil nutrient content under shifting cultivation in the Chittagong Hill Tracts of Bangladesh
Agricultural practice ; Agriculture ; Bangladesh ; Impact ; Nutrient ; Population pressure ; Rill wash ; Slope gradient ; Soil erosion ; Sustainable development ; Traditional agriculture ; Watershed
This investigation is a baseline study of the nutrient status in the topsoil and the impact of burning and subsequent runoff on changes in topsoil nutrients following land clearing and burning in a small catchment of 1 ha located on steep to very
steep slopes in the Chittagong Hill Tracts (CHT). It aims at showing the effect of Jhum cultivation on the nutrient status, soil loss and hence the sustainability of the agroecosystem.
Nutrient dynamics in southwestern Kattegat, Scandinavia : modelling transport, budget and consequences of reduced terrestrial loads
Carrying capacity ; Coastal environment ; Environment ; Europe ; Eutrophication ; Hydrobiology ; Hydrodynamics ; Model ; Nitrogen ; Nutrient ; Phosphate ; Scandinavia ; Sediment transport ; Suspended load ; Water quality
The aim of this work is to study to what extent local inputs of N and P affect the nutrient concentrations in a specific study area in the Dannish inner waters. The area chosen is one where the nutrient load is relatively high due to the presence
of major cities and industries. An existing hydrodynamical model was applied. 2 scenarios were simulated for 1990, one with the local load of external nutrients and one with a local load reduction according to the national Action Plan for the Aquatic
Changes in soil profile development and nutrient status due to the afforestation of agricultural land
In order to investigate the resultant changes in soil morphology and soil nutrients, a comparison was made of soils that had developed on land afforested with Picea abies at different times during this century, as well as those that had developed
The aims of this study are to elucidate tidal and meteorological induced variations in nutrient (both dissolved and particulate bound) behaviour. This is carried out below the tidal prism (in a tidal channel), in the tidal prism (on an intertidal
Nutrient fluxes in the Shenchong Basin, Deqing County, South China
Agroecosystem ; China ; Experimental catchment ; Granite ; Guangdong ; Land use ; Nutrient ; Rill wash ; Soil erosion ; Subtropical zone ; Water erosion ; Water quality ; Watershed
In the severely eroded granitic area of south China, the hillslopes are the source areas of, and the valleys are the sinks for, nutrients, water and sediments. The study of nutrient flux is important from both the soil fertility and water quality
perspectives. On denuded slopes, nutrient loss depletes soil fertility and makes afforestation effort difficult. The re-deposition of nutrients bound to the sediments in downslope areas determines the soil fertility in alluviated valleys and the potential
for developing these lands for beneficial use. Nutrients transported further down the fluvial system may affect the quality of the receiving water bodies.
Multi-scale analysis of soil nutrients at alpine treeline in Glacier National Park
Ecotone ; Montana ; Mountain ; Nutrient ; Soil ; Soil properties ; Tree line ; Tundra ; United States of America
This paper examines the heterogeneity of the edaphic environment at alpine treeline to determine if differences exist in the nutrient status (carbon, nitrogen, phosphorus, and potassium) of soils underlying tundra and arboreal vegetation. Data
nutrients occur ar the more xeric treeline sites. Heterogeneity of the edaphic environment has the potential to structure treeline response to climate change.