MAMMALS and birds sometimes seek shelter or nesting sites in the ground. Many of them scarcely affect the soil as a medium for plant growth. A notable exception is the soil-dwelling rodents. Although their acreweight is usually only about a few pounds even in the uncultivated land, their soil transporting activities sometimes are considerable. In building their tunnels and nests, they transport...

A field experiment was carried out to study the changes of soil bacteria, fungi and actinomycetes in saline-sodic soils for different numbers of cultivated years under drip irrigation. The drip irrigation had substantial effects on levels of bacteria, fungi and actinomycetes. With increased number of cultivated years under drip irrigation, the soil biological properties were greatly improved. A...

study of phytoseiid mites in some regions of western and north–westerniranwere carried out during 2008–2011. in this study, 21 species belonging to the six genera were collected and identified. they were associated with aerial parts, soil and litter under cultivated, uncultivated plants and some phytophagous mites and insects.

The source of N2O in terrestrial ecosystems has long been debated. Both nitrification and denitrification produce N2O but their relative importance remains uncertain. Here we apply site preference, SP (the difference in d15N between the central and outer N atom in N2O), to estimate the relative importance of bacterial denitrification (including nitrifier denitrification) to total N2O production...

The source of N2O in terrestrial ecosystems has long been debated. Both nitrification and denitrification produce N2O but their relative importance remains uncertain. Here we apply site preference, SP (the difference in d15N between the central and outer N atom in N2O), to estimate the relative importance of bacterial denitrification (including nitrifier denitrification) to total N2O production...

Abstract The aim of this study was to determine the distribution alpha-emitting plutonium isotopes from arable and uncultivated soils. effect soils cultivation on fractionation mobility studied using sequential extraction technique (modified Tessier’s method). Soil samples were collected surface layer in selected points. By means reagents with increasing leaching power, fractions separated: rea...

fungicides are most widely used pesticides in iran and the world. application of fungicides may affect the populations and activity of soil microorganisms, particularly fungi, with a consequence for soil fertility and crop growth. in the current study, the effects of different levels of metalaxyl on soil microbial biomass carbon (c) and nitrogen (n), microbial biomass c/n ratio and metabolic qu...