Abstract:

Stepwise discriminate analysis (SDA) was conducted using 33 variables from 8 meterological stations which are divided into 2 groups in this paper.Results show that principal limiting factors on natural forestation of P.sylvestris var.mongolica on sandy land include extremely lowest air temperature, extremely highest surface temperature, evaporation quantity in January and average days of accumulating snow for many years, which strongly influence the seed germination and the growth and development of shoots.Therefore, it is neccessary to choose suitable habitats or niches to overcome those adverse factors as mentioned above in aforestation pratice, and take effective artificial measures to promote its natural reforestation so as to guarantee their stable and sustainable development.

Key words: P.sylvestris var.mongolica on sandy land, Natural reforestation, Eco-climate, Hulun-ber Steppe, Stepwise discriminate analysis(SDA)