搜索结果: 1-15 共查到“理学 Wales”相关记录39条 . 查询时间(0.078 秒)
Can we model observed soil carbon changes from a dense inventory? A case study over England and Wales using three versions of the ORCHIDEE ecosystem model (AR5, AR5-PRIM and O-CN)
model observed soil carbon changes inventory
2014/12/12
A widespread decrease of the topsoil carbon content was observed over England and Wales during the period
1978–2003 in the National Soil Inventory (NSI), amounting
to a carbon loss of 4.44 Tg yrW...
The occurrence of groundwater in the Lower Palaeozoic rocks of upland Central Wales
groundwater upland Central Wales Lower Palaeozoic rocks
2009/6/8
A series of boreholes of up to 50 m depth, drilled into Lower Palaeozoic mudstone, shale and greywacke bedrock in the headwater catchment areas of the River Severn at Plynlimon in Central Wales, show...
Regional modelling of acidification in Wales：calibration of a spatially distributed model incorporating land use change
Wales acid neutralising capacity Model of Acidification of Groundwater In Catchments
2009/6/5
The Model of Acidification of Groundwater In Catchments (MAGIC) has been calibrated to 94 catchments in Wales, enabling the quantification of regional response to reduced emissions under the second s...
A regional application of the MAGIC model in Wales：calibration and assessment of future recovery using a Monte-Carlo approach
Wales Model of Acidification of Groundwater In Catchment Monte-Carlo approach
2009/6/5
A survey and resurvey of 77 headwater streams in Wales provides an opportunity for assessing changes in streamwater chemistry in the region. The Model of Acidification of Groundwater In Catchment (MAG...
The impacts of conifer harvesting on runoff water quality：a regional survey for Wales
runoff water quality Wales regional survey
2009/6/5
Major, minor and trace element chemistry of runoff at stormflow and baseflow from 67 catchments (2 to 5 ha in area) has been determined to investigate the effects of clear felling and replanting of co...
Analysis of the impacts of major anion variations on surface water acidity particularly with regard to conifer harvesting：case studies from Wales and Northern England
surface water acidity Wales Northern England
2009/6/5
Data on the water quality of streams draining a range of acidic and acid sensitive, mainly afforested, upland catchments in mid- and north-Wales and northern-England are described to investigate the a...
Spatial variability of nitrate concentration in lakes in Snowdonia, North Wales, UK
Spatial variability North Wales nitrate concentration
2009/5/26
At a regional scale, high nitrate (NO3‾) concentrations in upland surface waters generally occur in tandem with high nitrogen (N) deposition levels. However, significant differences in the patte...
Lanthanum, cerium, praseodymium and yttrium in waters in an upland acidic and acid sensitive environment, mid-Wales
upland acidic mid-Wales acid sensitive environment
2009/5/18
The less than 0.45 mm filterable lanthanum (La), cerium (Ce), praseodymium (Pr) and yttrium (Y) concentrations in rainfall, cloud water, stream and groundwater in the upper River Severn catchments of ...
Hydrochemical heterogeneity in an upland catchment：further characterisation of the spatial, temporal and depth variations in soils, streams and groundwaters of the Plynlimon forested catchment, Wales
upland catchment Hydrochemical heterogeneity Wales
2009/5/18
The heterogeneous nature of upland hard-rock catchments in terms of geology, geomorphology, superficial deposits, soil type and land use gives rise to a range of hydrochemical characteristics in strea...
Determination of bromide, chloride, fluoride, nitrate and sulphate by ion chromatography: comparisons of methodologies for rainfall, cloud water and river waters at the Plynlimon catchments of mid-Wales
bromide chloride fluoride nitrate sulphate Plynlimon catchments
2009/5/6
The results of determination of bromide, chloride, fluoride, nitrate and sulphate using ion chromatography (IC) are compared with those obtained by colorimetric and inductively coupled plasma optical ...
Dissolved iodine in rainfall, cloud, stream and groundwater in the Plynlimon area of mid-Wales
rainfall cloud groundwater Plynlimon area
2009/5/6
Iodine concentrations in rainfall, cloud water, throughfall, stemflow, stream water and groundwater are described for the upper River Severn Plynlimon catchments in mid-Wales. Iodine concentrations av...
The long-term water balance (1972–2004) of upland forestry and grassland at Plynlimon, mid-Wales
long-term water balance grassland upland forestry
2009/5/6
This paper reviews research into the hydrological impacts of UK upland forestry and updates the water balance of the Plynlimon research catchments for the period 1972–2004. Comparison of this network ...
Cycling of nutrient base cations in a twelve year old Sitka spruce plantation in upland mid-Wales
Forestry base cations
2009/3/24
The effects of the early growth of plantation forestry on the biogeochemical cycling of potassium, calcium and magnesium have been investigated in a stand of 12 year old Sitka spruce and adjacent moor...
Sodium and chloride levels in rainfall, mist, streamwater and groundwater at the Plynlimon catchments, mid-Wales: inferences on hydrological and chemical controls
Sodium chloride rainfall mist
2009/3/24
Variations in sodium and chloride in atmospheric inputs (rainfall and mist), stream runoff and groundwater stores are documented for the upper Severn River (Afon Hafren and Afon Hore catchments), Plyn...
Effects of plantation forest clearfelling on stream temperatures in the Plynlimon experimental catchments, mid-Wales
stream temperature air temperature
2009/3/24
Hourly stream temperatures monitored over 28 months, which spanned a 3 month period of environmentally sensitive plot-scale harvesting of 20 ha. (20%) of the Nant Tanllwyth catchment (0.89 km2) on the...