The ecological water demand (EWD) is the least water amount required to maintain the structure and the function of the special eco-system and the temporal scale
With the classification data covering American land-use/land-cover(LUCC)with 30 mresolution from the project of National Land Cover Data(NLCD),we normalized the
During the last decade of the 20th century, extensive conversion in agricultural land use took place in Northeast China. The goal of this study is to ascertain