嫩江沙地几种植物根系垂直分布的研究

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。

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

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.