In order to understand the soil nutrients of Pinus sylvestris var. mongolica in northern Bashang （upper dam） aera of Hebei Province and the relationship between the soil nutrient conditions and the growth, typical sampling method was adopted. The main results were as follows. There were distinct differ- ences in contents of nutrient elements among different forests in different sites, the highest content was found in loamy soil in the upper dam mountain and loamy soil in the down dam mountain, and the lowest was in sandy soil in upper dam western Mandian and in loamy soil in the flat land under dam. The contents of soil nutrients on the dam area were generally close to that of under dam,but the differences of the soil nutrient contents in different forest areas under darn were obviously greater than that on the dam area. The contents of total N avilable N, total P, available P, total K, available K in the soil increased with the increase of organic matter, and there was a close regression relationship between them. However, the form of the re- gression relationship was different. On the basis of regression relation,the contents of other soil nutrients were estimated by organic matter. It did not show a significant positive correlation between the dominant tree height and the contents of the soil nutrient, but there was a positive correlation between dominant height and soil thickness. In summary, P. sylvestris var. mongolica was suitable to grow in deep soil site, but the requirement for soil nutrient content was not high.
Journal of Northwest Forestry University
Pinus sylvestris var. mongholica plantation
soil organic matter
Northern Bas-hang Aera of Hebei Province