Effects of Erosion Micro-Topographies on Plant Colonization on Weathered Gangue Dumps in Northeast China

Micro-topography has been proved to be beneficial for plant colonization in severe environments. There are numerous micro-topographies caused by erosion of gangue dumps the Northeast China, which can make difficult. To determine how these affect colonization, environment conditions, regeneration characteristics, vegetation characteristics different micro-topographies, such as bare slope, rill, ephemeral gully and deposit body were studied, their relationships analyzed. The results showed that content particles with a size < 2 mm slope was 33.7% 7.8% higher than gully, respectively (p 0.05), while > 20 2.24 times body. Except substrate water content, temperature surface humidity significantly from those 0.05); highest (54.6 °C) lowest among micro-topographies. coverage, seedling density differences 5.26, 35.9 16.8 times, respectively. (Vdc) more affected (Rc) well (Sht), Rc Sht, extremely soil physical properties 0.01). Different species had responses environmental conditions In conclusion, rill likely promote is driven mainly seed supply comfortable growing conditions. not suited because its unhealthy mechanical composition strong runoff scouring, it prone drought, high temperature, lack seeds.