Dendrochronology Study Of Responses Of Pinus Sylvestris Var. Mongolica Plantation To Climate Change In Liaoning Province

Based on the theory of dendroclimatology, we studied the sample sites, and took 30 sites Pinus sylvestris var. mongolica sample trees from study area. According to the international stadard and menthod of dendroclimatology, we developed 30 sites STD chronologies by using Regional Curve Standardization (RCS) curves. All of sample sites were divided into three sub-regional based on the results of meteorological data Cluster analysis menthod, and we analyzed the climate information of chronologies reflected in each regional. Then, the varation of Pinus sylvestris var. mongolica planation forest ecosystem’s NPP were also analyzed. Furthermore, the characters of Pinus sylvestris var. mongolica planation forest ecosystem’s NPP to different future climate change scenarios were predicted. The main conclusions were listed as follows:1. According to the results of response relationships between the radial growths of trees and monthly total precipitation, monthly mean relative humidity, monthly mean temperature, the response of different regional Pinus sylvestris var. mongolica tree ring widths to climate factors is not consistent. The precipitation and relative humidity of the early stage of growing season and growing season had significant positive on the growth of tree growth, especially in regional Ⅰ and Ⅱ. However, the high temperature of growing season had negative influence on the growth of Pinus sylvestris var. mongolica. The correlation of tree growth with moisture index than separate climate factor correlation significantly, it indicated that the combined influence of rainfall, temperature and relative humidity has an obvious effect of tree growth.2. This study analyzed the relationship between productivity of Pinus sylvestris var. mongolica productivity indicated by BAI and climate productivity with monthly total precipitation, monthly mean relative humidity, monthly mean temperature, the results show that the study area Pinus sylvestris var. mongolica productivity has an increase trend in each climate regional, and increase from northwest to southeast on the space. The change of Pinus sylvestris var. mongolica productivity consistented with the moisture (precipitation and relative humidity) gradient change in the study area, and increased with the precipitation and relative humidity.3. We analyzed the change trend of limate productivity under different climate change scenarios, suggesting that productivity had decreased when warm-dry climate, however increased with warm-wet climate which more favorable to accumulated the dry matter of trees. No matter what type of wet or dry climate conditions, it’s impact to Pinus sylvestris var. mongolica productivity in northwest of Liaoning province are larger, the precipitation is the main influencing factor of the Pinus sylvestris var. mongolica productivity in the study area.