The Response Of Ancient Tree-rings To Climate Change In4Important Scenery District

The ancient trees resources experienced the historical changes of the nature, they also recorded the history of human activity and change of history, so they provided valuable information for the human to find the change of ancient climate, and ancient trees are valuable asset for humanity. The annual rings of ancient trees contain important information for environmental change. The annual rings of old trees contain important information for environmental change. In this paper, by studying the variation of ancient trees’ring width,we analyzed response of ancient trees to the environmental change, and reconstructed the history of the region climate.Selecting Beijing Xishan Mountain Forest, Jiufeng Mountain Forest, Shandong Taishan National Nature Reserve and Jianping County of Liaoning Province, Fu Town four locations as a scenic area, select three representative species of cedar, ginkgo, pine for tree-ring analysis of the establishment of ancient tree ring chronologies. Combined with meteorological data of the area in the past50years, using ecological indicators to analyze the impact of climate change on tree growth, reconstructed the historical climate of the three regions.The results show that the effect of Wi and Ci for tree growth due to different species and region. The higher Hi, the more significant effect of ring width in the region. The Ii for tree growth due to different species. The precipitation on Summer is positive for the growth of orientalis, while the temperature is negative for them. The temperature in ginkgo’s non-growing season is positive for the wheel width, in the growing season is negative; however the precipitation is positive for ginkgo growth. Most times during the growing season, the temperature does not show any reference with the pine chronologies, but before and after the growing season and the dormant period, the chronologies shows the positive influence with the high temperature and the negative influence with the low temperature, and pine shows significant response on winter temperature. The reconstruction of historical climate show that whether it is relatively dry areas in Beijing and Liaoning Jianping, or rainy Taishan area, the climate is warmer and drier. By moving average analysis of the results of reconstruction of historical climate change, we find that Beijing area has three periods of drought and four wet period. Jianping in Liaoning province is shown that it is dominated by wet period in the last230years, and is currently in a relatively dry period. Taishan region shows that between1086-1993years,it take longer time to transform the warm period and cold period,While the1591-1744years and1775-1833years is the two obvious cold period in the little ice age.