TY - JOUR T1 - Researching gully erosion in Mexico JF - Journal of Soil and Water Conservation SP - 365 LP - 367 VL - 47 IS - 5 AU - G. Bocco AU - F. Garcia Oliva Y1 - 1992/09/01 UR - http://www.jswconline.org/content/47/5/365.abstract N2 - LAND degradation through soil erosion is surprisingly widespread; 35 percent of the world's surface is affected by some degree of erosion. One of the regions with the most severe problems is Latin America (261, and Mexico is one of the most affected countries (21). Various erosion inventories (4, 5, G, 27) have shown that some degree of erosion occurs on 65 to 85 percent of the land. Severe erosion occurs on an estimated two to nine percent of the land, with estimates as high as 47 percent (61. An official report indicated that 40 percent of the topsoil in Mexico has been lost and that this loss represents a reduction in agricultural productivity of about 30 percent (17). Local literature dealing with erosion is not abundant, reflecting the relatively little attention that the subject has received in Mexico. Maass and Garcia-Oliva (12) developed and analyzed a data base on local erosion and conservation … ER -