1. Allan JD, Erickson DL, Fray J (1997) The influence of catchment land use on stream integrity across multiple spatial scales. Freshwater Biol 37:149–161
2. Alva AK, Larsen S, Bille SW (1980) The influence of rhizosphere in rice crop on resin-extractable phosphate in flooded soils at various levels of phosphate application. Pl Soil 56:17–33
3. Arrowsmith N (1996) Developing criteria for wetland and vegetation management within groundwater abstraction area. In Barber G, Davia G (eds) Groundwater and land use planning conference proceeding. Centre for Groundwater Studies, CSIRO Division, Groundwater Studies, Perth, pp 126–136
4. Bevilacqua M (1988) Cambios en la estructura fisonómica y composición florística de una comunidad de Morichal, como consecuencia de derrames de petróleo y acción del fuego (Structural changes on the physiognomy and floristic composition in a morichal community as a result of oil spill and fire). Trabajo especial de grado, licenciado en Biología, Escuela de Biología, Universidad Central de Venezuela, Caracas
5. Bohm W (1979) Methods of studying root systems. Ecological Studies, vol. 33, Springer Verlag, Berlin