嫩江沙地几种植物根系垂直分布的研究

Vertical Distribution of Root System of Several Plants in Nenjiang Sand Land

采用全部分层挖取法研究了银中杨(Populus alba×Populus berolinensis)、沙棘(Seabuckthorn)、沙枣(Elaeag-nus angustifolia)和山杏(Prunus arm eniaca)4个树种的根系分布情况。结果表明:各树种之间根系的垂直分布差异显著,银中杨根系在0～120 cm土层中均有分布,林龄越大分布越深,但主要集中在0～40 cm的土层中,而且以直径小于7 mm的根系为主;沙棘根系分布较浅,在0～30 cm土层中,分布相对均匀;沙枣根系分布最深仅达20 cm;山杏的根系分布虽可达130 cm,但主要还是集中在10～50 cm土层中。根系总量分布由大到小依次是银中杨、沙棘、沙枣、山杏。

By whole-digged method, distribution of root system of Populus alba × berolinensis, Seabuckthorn, Elaeagnus angustifolia and Prunus armeniaca were studied. The results show that the vertical distribution of root system of the four species is different significantly. The distribution of root system of Populus alba × berolinensis is under 0 ～ 120 cm soil layer, and mainly centralizes almost under 0 ～40 cm surface layer, with most roots less than 7 mm in diameter; The distribution of root system of Seabuckthorn mainly concentrates under 0 ～ 30 cm soil layer relatively uniform; which of Elaeagnus angustifolia is limited to the depth of 20 cm; The distribution of the root system of Prunus armeniaca can spread the depth of 130 cm, but mainly concentrates under 10～50 cm soil layer. Thus the order of root mass is Populus alba × berolinensis,Seabuckthorn,Elaeagnus angustifolia and Prunus armeniaca, which is the least of all.