Study on root distribution and mechanical properties of pinus tabulaeformis in dumps of an opencast coal mine, Shanxi, China
The study area was the dumps of maximum opencast coal mine in Shanxi, the three reclamation substrates of thin loess, thick loess and soil-rock mixture were chosen as sample plots, the root distributions ofpinus tabulaeformis growing in which were surveyed by profile excavation method and local specimens method.The mechanical properties of roots and water-holding capacity of litter ofpinus tabulaeformis were tested.The results showed that:(l) In the thin loess, the root diameter ofpinus tabulaeformis was 0-6.5 mm, the root weight density and root length density distributed evenly and were wavy with the increasing diameter in each soil layer.In the thick loess, the root diameter was between 0-3.5 mm, the root weight density and root length density were the biggest in deep soil layers.In the soil-rock mixture,the range of root diameter and root weight density and root length density were all the smallest, and roots tended to develop in surface soil.(2) The root diameters tested successfully ranged from 1.49 to 3.31 mm,the tensile force increased with increasing diameter according to a power function, the tensile strength decreased with increasing diameter at the level of a power function.The root stress-strain curve showed the single-peak curve with the characteristics of elastic-plastic.(3) The water-holding rate of litter increased with socking time at a power function, and there was a significant difference in three reclamation substrates (P < 0.05).The reclamation substrate has a great influence on the root distribution and soil reinforcement.
Pinus tabulaeformis reclamation substrate root distribution tensile properties water-holding rate of litter
C.J.Lv W.G.Chen D.Chen X.X.Guo
College of Resources and Environmental Science, Shanxi Agriculture University, Taigu, China College of Life Sciences, Shanxi Agriculture University, Taigu, Shanxi, China
国际会议
The 2nd International Symposium on Land Reclamation and Ecological Restoration (第二届国际土地复垦与生态修复学术研讨会)
西安
英文
263-267
2017-10-20（万方平台首次上网日期，不代表论文的发表时间）