Sediment load in rivers is recognized as both a carrier and potential source of contaminants. deposition significantly changes river flow morphology, thereby affecting stream hydrology aquatic life. We projected sediment from the Pearl River basin (PRB), Mississippi into northern Gulf Mexico under future climate with afforestation using SWAT (Soil Water Assessment Tool)-based HAWQS (Hydrologic ...

We analyze the decision to participate and performance at the Modern Olympic Summer Games at the country level. We use an unbalanced panel of 118 countries over all 24 editions of the Summer Games since 1896. The main focus of the paper is on economic, geographic and demographic determinants of Olympic participation and success. We estimate the impact of income per capita, population size, home...

mountainous rangeland ecosystems have a highly delicate position in ecologic areabecause of severe environmental conditions and having wildlife and livestock. knowing andrealizing the biotic and abiotic components, which have an interaction with each other in thisecosystem, perform the most important role in to desirable management of it. the systematicmanagement is one of the managing features...

The research shows that widely used key measures of vegetation structure (species diversity, projected cover and above-ground phytomass) are not always suitable as indicators of pasture degradation. Based on an analysis above-ground phytomass composition, new quantitative indices are offered that give a more realistic picture of rangeland condition in Mongolia.

subalpine rangeland as a rara avis ecosystem is very important because ofecological features. consistency and resistance of this ecosystem is so frangible and itsnatural equilibrium is instable due to the effects of biotic and abiotic factors. the landslideas one of negative consequences in upland area is seen in masoleh watershed (north ofiran). this study has investigated the roles of biotic ...