关键词: 梭梭（Haloxylon ammodendron）幼苗, 根区土壤, 土壤水分, 土壤电导率, 生长, 关系

Abstract: In order to explore the adaptation mechanism of Haloxylon ammodendron seedling growth to the dynamic changes of ecological factors in its habitat, the relationship between growth indexes of Haloxylon ammodendron seedling and the soil moisture content and electrical conductivity in the root zone of Gurbantunggut Desert of Xinjiang was studied and analyzed. The results showed that the soil moisture content of seedlings root zone in the habitat area in late July was the lowest and the difference of soil moisture content in different habitat areas was also the smallest. The soil moisture content ranged from 0 to 3.75 %, and increased gradually with the increase of soil depth. The maximum soil electrical conductivity in habitat K (Karamay research area) and Q (Qitai County desert research area) appeared at 0~40 cm and 80~100 cm respectively, with values of 1 103.03 μS/cm and 244.23 μS/cm. The soil electrical conductivity in habitat area K was higher than that in habitat area Q. Among the growth indexes of Haloxylon ammodendron seedings, except for the ground diameter of seedlings, the plant height, crown width and shoot length were generally in the form of habitat area Q greater than habitat area K. Soil moisture content at seedling growth stage was positively correlated with plant height, crown area, tip length and ground diameter, and was significantly correlated with crown area(P<0.05). The correlation coefficients between soil moisture content and seedling crown area were 0.987 and 0.974 in habitat area K and habitat area Q, respectively. The correlation between soil electrical conductivity and seedling growth indexes was different in different habitat areas. The soil electrical conductivity of habitat area K and habitat area Q had the strongest correlation with seedling shoot length and crown area, and the correlation coefficients were 0.927 and 0.932, respectively (P<0.05). The soil moisture and electrical conductivity of root zone in habit area K and habit area Q were beneficial to the growth of Haloxylon ammodendron seedlings, but the soil in habit area Q was more suitable for the growth of Haloxylon ammodendron.

Key words: Haloxylon ammodendron seedlings, soil of root zone, soil moisture, soil conductivity, growth, relationship