Scots pine (Pinus sylvestris L.) is the one of the most important economic timber species even their distribution is very limited in Mongolia compared with Larix sibirica. P. sylvestris stand cover only 5% of total forest cover of Mongolia and distributes in subtaiga elevational zone. Forest resources in Mongolia have been continuously degraded over the past few years due to improper exploitation for timber and fuel wood (both permitted and illegal), forest and steppe fires [18], insects/pests and diseases, mining, uncontrolled grazing, and inadequate management. Hence, conservation of Scots pine forests which have very limited distribution is very important for this region. The study sites are located in Tujiin nars area, Altanbulag soum, Selenge province in the transitional zone where the mountainous zone around Lake Baikal changes to the Northern Mongolian highlands and are parts of the northern mountain range. Analysis of soil physical and chemical properties shown that seed stands with site index II has more humus accumulation (1.32%) than that of seed stands with sites index III (0.73%) and IV (0.65%), respectively, which suggests that site index or growth condition of forest stands which subjected as seed collection stands should be classified as site index II or III, accordingly.
