Responses of Qilian junipers radial growth of different ecological environment and detrending method to climate change in Qinghai Province

In this paper, more Qilian juniper (Sabina przewalskii Kom.) tree ring samples in 12 sites from different ecological environment in Qinghai Province are collected, and the 12 tree ring chronologies are developed using three different detrending methods, contain spline function detrending method (SPL), negative exponential fitting detrending method (NEP) and regional curve detrending method (RCS). Combined temperature and precipitation data from 30 Meteorological stations in Qinghai, the Qilian juniper radial growth responses to climate in the different ecological environment and detrending method were analyzed using correlation function and the response function method. The results showed that the tree-ring chronologies significantly affected by the westerly climate in Qaidam Basin and Qilian Mountains, and the Indian monsoon dominate to Qilian juniper radial growth on southern Qinghai Plateau. In the eastern Qinghai, Qilian juniper radial growth affected by the East Asian monsoon.