Awareness of the forage nutritive value of rangeland species is important to provide a balanced diet in order to meet the nutritional requirements of ruminants and to determine the suitable grazing time and rangeland grazing capacity. Hence, different laboratory methods were used to compare the nutritional value of Centaurea cyanus, Fumaria officinalis, Galium tricornutum and Vicia sativa as co...

The influence of organic matter chemistry on the sorption of diuron to soils collected from a small (2 ha) field was investigated. Organic carbon-normalized sorption coefficients (KOC), determined by batch sorption, varied between 405 and 598 Lkg amongst 10 A11 horizons, and between 547 and 975 Lkg amongst 10 matching A12 horizons. In all cases KOC was greater for the A12 horizon than the corre...

Published information is contradictory about the inhibitory or stimulatory effect of living roots on soil organic matter d~m~sition. In this study, i4C-labelled rye straw was exposed in fertilii or unfertilized soil with or without plants (winter rye, Se&e cereuIe) for 49 days under semi-controlled conditions. Our objective was to study the effect of roots on soil organic matter mineralization ...

We conducted a 3-year study designed to examine the relationship between disturbance from military land use and stream physical and organic matter variables within 12 small (<5.5 km2) Southeastern Plains catchments at the Fort Benning Military Installation, Georgia, USA. Primary land-use categories were based on percentages of bare ground and road cover and nonforested land (grasslands, sparse ...

Larval ecology is an important aspect of the population dynamics of anopheline mosquitoes (Diptera: Culicidae), the vectors of malaria. Anopheles larvae live in pools of stagnant water and adult fitness may be correlated with the nutritional conditions under which larvae develop. A study was conducted in Mbita, Western Kenya, to investigate how properties of the soil substrate of Anopheles gamb...

A quantitative study of metazoan meiofauna was carried out on bathyal sediments (305, 562, 830 and 1210m) along a transect within and beneath the oxygen minimum zone (OMZ) in the southeastern Pacific off Callao, Peru (128S). Meiobenthos densities ranged from 1517 (upper slope, middle of OMZ) to 440– 548 ind. 10 cm 2 (lower slope stations, beneath the OMZ). Nematodes were the numerically dominan...

in this study the environmental problems has been studied in south east of tehran (bibi shahrbanou mount). 31 sediment samples were taken from 10-15 cm extremity of streams and were analyzed by icp. toxic elements studied include: ag, as, cd, cr, cu, ni, pb, sb and zn. the samples were also investigated for mineralogy using xrd. the clay mineral assemblage encountered in the analyzed samples is...

BACKGROUND AND AIMS Epiphytism imposes physiological constraints resulting from the lack of access to the nutrient sources available to ground-rooted plants. A conspicuous adaptation in response to that lack is the phytotelm (plant-held waters) of tank-bromeliad species that are often nutrient-rich. Associations with terrestrial invertebrates also result in higher plant nutrient acquisition. As...