Water quality in terms of metals during flooding in two ecosystems of the Conchos Watershed,Mexico:rangeland-forest and urban areas

摘要

@@Introduction Water from the Conchos River is essential for about 1 million inhabitants of the State of Chihuahua-Mexico and economically fundamental for three irrigation districts of the state covering about 64 ,000 km2.Moreover,the Conchos River is the main water supplier to the lower Rio Grande/Rio Bravo ( TNRCC,1994 ) that serves as the natural boundary between Mexico and the United States of America ; the river water is mainly utilized by Texas'producers.