Response Of Pinus Sylvestris Var.mongolica Productivity To Climate Change In Different Regions Of Sandy Land

This study takes the ecological maladaptation problem of Pinus sylvestris var.mongolica in the sand introduced land of Inner Mongolia as the starting point.In response to the decline in growth rate,decline,and even death of Pinus sylvestris in the artificially introduced sand land,the ring width of Pinus sylvestris var.mongolica at different sampling points was measured using tree ring analysis methods,Calculate the Basal area increment(BAI)and Net primary productivity(NPP)of Pinus sylvestris var.mongolica,establish a chronology of ring width,analyze the differences in radial growth and NPP of Pinus sylvestris var.mongolica in different regions,and their response mechanisms to climate change.The aim is to provide scientific basis for evaluating the suitability of the introduction range and region of Pinus sylvestris var.mongolica in Inner Mongolia.The main research conclusions of this article are as follows:1.There are significant differences in the trend of incremental changes in the chest height and cross-sectional area of Pinus sylvestris var.mongolica plantations at different sampling points.Except for the increasing trend in the chest height and cross-sectional area of Pinus sylvestris plantations in Guri Gustai in recent years,all other sampling areas in this study showed signs of slow growth or even decline2.The main influencing factors on the radial growth of Pinus sylvestris var.mongolica are annual precipitation and average temperature,with the eastern region of Inner Mongolia being more sensitive to average temperature.The growth of Pinus sylvestris var.mongolica is mainly limited by average temperature;The western region is more sensitive to average precipitation,and the growth of Pinus sylvestris var.mongolica is mainly limited by average precipitation.3.Except for the Guriguez Plateau,the net primary productivity of natural Pinus sylvestris forests is much greater than that of artificial Pinus sylvestris forests,and the net primary productivity of Pinus sylvestris shows a decreasing trend from northeast to southwest.The meteorological factors that have a significant impact on the net primary productivity of Pinus sylvestris are annual precipitation and SPEI,and annual precipitation is the main limiting factor.4.The most suitable introduction site for Pinus sylvestris var.mongolica in sandy areas should have an annual average temperature between-3～1℃ and an annual precipitation between 400～450mm.Areas with precipitation below 300mm and temperatures above 7℃ are not suitable for Pinus sylvestris growth.