Abstract Water scarcity and soil erosion are the main constraints small holder farmers facing in Tigray, northern most part of Ethiopia. Both very high low precipitation can cause a damage to agriculture which is case semi-arid regions like Tigray. While too little rainfall cannot support growth crops resulting crop failure, short but intense also causes runoff thereby washing away essential nu...

Biological invasion is one of the major threats to global biodiversity attracting a primary focus scientific attention. During past decades, due diversity and peculiarity species, coupled with vulnerable ecosystem, karst areas have received more Numerous investigations studies confirmed that in Southwest China are suffering from biological invasions under intensified human activities climate ch...

In view of the problems involved in remote sensing monitoring urban air quality, including low spatial resolution, only for a single pollutant, complex inversion algorithms, and difficultly obtaining parameter values, this study, new difference smog index (DSI) was developed, then comparison with normal haze index, MODIS aerosol optical depth products. The results show that DSI model developed ...