Study On The Growth Law Of Pinus Sylvestris Var. Mongolica. And The Influential Factors

Pinus sylvesfris var.mongolica was a geographical variation of Scots pine, and it was distributed in Saihanba area. The species has important value in both conservation and research. The mainly processed researches of Pinus sylvesfris var.mongolica were in morphological description, ecological characters, and cultivation technique ect. The research were reviewed on the basis of broad reference both in home and abroad. In order to supply theoretical basis for the generalization and management of Pinus sylvestris var. mongolica, the effects of meterological factors on the growth quantity of Pinus sylvestris var. mongolica were studied by grey relation analysis based on the data of 5 analytical stem and meterological data of the fastest 30 years in SaiHanba Area. In this study, Pinus sylvestris var. mongolica was used as the objectvie in this area. The main results were as follows:(1)The diameter, height and volume total increment of Pinus sylvestris var. mongolica, rised constaintly along with the growth of stand age. Current annual increment and average increment was increasing with the growth of stand age, but the former one was faster, which value was larger. In the curve, time current annual increment achieving the peak was earlier than the one of average growth capacity. After achieving the peak, current annual increment gradually intersect with average growth capacity. Then, the value of current annual increment was small than average one. The peak of current annual increment of diameter at breast height was longer haul than the one of tree height, while the peak of volume inside bark was later than the ones above. Capacities in successive years of diameter at breast height, height and volume were fluctuant.(2)The increment of diameter of Pinus sylvestris var. mongolica were most closly related to the mean ground temperature from November last year to Januuary some year(X8) analyzed by grey relation analysis,and the most important climatic factors that effected the increment of height of Pinus sylvestris var. mongolica were the annual sunshine hours(X5). The order of the effect of the climatic factors on the increment of Pinus sylvestris var. mongolica was the mean ground temperature from November last year to Januuary some year(X8) > the annual sunshine hours(X5) > the annual precipitation(X2)/ the annual evaporation from april to october(X4)/the ground temperature from march to april(X6)>others.