Abstract: The variation trends of moisture and salinity within the 0~50 cm depth soil, in which the wild Apocynum venentum L. distributed in the West Jilin, were studied. The results showed that there are three different kinds of distribution regions in horizontal pattern, the concentrated regions, the marginal regions and the blanked regions. The soil moisture trends are similar in concentrated regions and marginal regions; the soil moisture in the blanked regions is higher than those in the other two regions; the fluctuation range of soil moisture decreases with the increase of the soil depth in the vertical pattern. The soil salinity is different in horizontal pattern. The salinity in the blanked regions is dramatically higher than those in the other two regions, within which the salinity in the marginal regions is higher than that in the concentrated regions. In the vertical pattern, the fluctuation range of salinity in the concentrated regions decreases with the increase of soil depth; in the blanked regions and the marginal regions, the soil salinity is not only much higher but also has a larger fluctuation range in the soil depth of 20～30 cm than those in the depth of 0～20 cm and 30～50 cm. In horizontal pattern, the soil pH value in marginal regions is higher than those in the concentrated regions. In the vertical pattern, the soil pH value in the depth of 20～30 cm of the concentrated regions as well as in the marginal regions is higher than those in the depth of 0～20 cm and 30～50 cm; the soil pH value of the blanked regions has a negative correlation with the increase of soil depth. The ranges of moisture content, the soil salinity and the pH value for the normal growth of A.venentum L. are respective 9%～20%, 0.05%～0.25% and 7.8~9.4. A.venentum L. can not grow normally under the following conditions that the soil moisture content is below 5% or over 21%, the soil salinity is over 0.35% and the pH value is over 9.8. A.venentum L. has developed root system, which can store much water to adapt to the drought environment. This plant grows well when it is cultivated by the using of ridges, which are 20 cm to 30 cm high. A.venentum L., whose seedlings can bear high soil salinity and pH value, is a kind of economic plant which can adapt to the drought and alkali-saline environment.

Key words: West Jilin, Apocynum venentum L., soil moisture, soil salinity, soil pH value