报告摘要：In order to understand the mechanism governing the development of transport barrier bifurcation, a European transport project has been recently promoted for studying the link between radial electric fields, long-range correlation (LRC) and zonal flows, and edge bifurcations in fusion plasmas. The main results are: (i) discovery of LRC and zonal flows in potential fluctuations that are amplified during the development of radial electric fields using electrode biasing in stellarators [TJ-II, TJ-K] and tokamaks [TEXTOR, ISTTOK] and during the spontaneous development of edge sheared flows in the TJ-II stellarator; (ii) comparative studies in tokamaks, stellarators and reversed field pinches have revealed significant differences in the level of the LRC, suggesting influence of magnetic perturbations in the long-range correlation; (iii) the degree of the LRC is strongly reduced as approaching the plasma density limit in the TEXTOR tokamak, indicating the possible role of collisionality and the impact of mean Er×B flow shear as well on zonal flows.