Pastures may act as carbon sources and sinks depending on grazing pressure management practices. Soil organic (SOC) stock its fractions were quantified under 3 different intensities using 5, 10 15 sheep/ha sown, improved natural pastures in the semi-arid tropics of India. Results revealed that after years, pasture had significantly higher particulate (POC ~4.5 g/kg), SOC (~0.53 %), total (TOC~7...

this research aimed to evaluate the effect of planting seasons (autumn and spring) on 10 accessions of two species of astragalus effusus and astragalus brachyodontus in the field condition (homand absard station, damavand). after preparing the seedbed, the plant species were planted on two lines in 2 m, where the spacing between the lines of each accession was 0.5 m, and the spacing between the...

12.2 Biological Crusts of Arid Regions ............................. 346 12.2.1 Characteristic Species ................................................... 346 12.2.2 Taxonomic Problems in Describing Crust Cyanobacteria ...................................................... 347 12.2.3 Environmental Factors .................................................. 348 12.2.3.1 Light .......................