Study On Tree - Ring Element Response Under The Influence Of Climate Change And Tourism Activities

In order to study the impact of climate change and tourism activities on the tourism environment, the paper chooses Taibai Mountain national forest park as the research area, taking the method of combining the wild fixed-point sampling, indoor experiment and data correlation analysis. The main conclusions in this paper are as follows:① The five heavy metal elements content of the tree ring samples in the study area are increased with the change of time, the reason is associated closely with the external disturbance and human factors. Among the five heavy metal elements, the growth of Cr, Pb, Zn are greatly influenced by vehicle emissions and the scenic area constructions, while tourists and pollution of park construction had a great influence on the growth of Cu、Ni. According to the quadratic polynomial fitting curve, heavy metal content is calculated in the future ten years of 2015-2024. Cr element content of trees rings in the study area will reach 15.86 μg·g-1, Cu element content will reach 8.24 μg·g-1, Ni elements will reach 2.858 μg·g-1, Pb element content will reach 0.6817 μg·g-1, zinc element content will reach 16.26μg·g-1 in the year of 2024, respectively.② By fitting with visitors in the park from 1992 to 2012, the test of heavy metal element content of trees rings samples in the study area, together with the quadratic polynomial regression curve fitting, exponential regression curve and the power function curve, and the trees rings element regression analysis with the number of visitors, shows that the significant level of tree rings elements and the number of tourists:Fcr= 0.000742, FCu= 0.000245, FNi= 0.000025, FPb= 0.0000015, FZn= 0.0008725, Which means that the regression effect is very significant. The correlation coefficient are Rcr= 0.8671, Rcu = 0.8236, RNi= 0.8469, RPb= 0.8627 and RZn= 0.8794, respectively, shows that the change of five kinds of heavy metal element content is affected by the number of visitors.③It also shows that the concentration of Cr and Pb element in the five heavy metals is greatly influenced by the temperature and precipitation, by producing the diagram of the test of heavy metal content in the tree rings samples in nearly 30 years trees and climate factors of temperature and precipitation, and analyzing the relationship between the tourism environment and climate factors. Which Cr element content changes are in inverse correlation with the temperature and precipitation, a rise in temperature will stem the enrichment of Cr element in tree rings if there is no outside interference. While Pb element content is positively correlated with temperature changes, and appears the "lag effect". The other three elements, Cu, Ni, Zn is less affected by the temperature and precipitation.④ This paper also demonstrates the lead island effect, heat island effect, turbid island effect of the sightseeing place in the study area.The above results indicate that the impact of the intervention of outside tourists which effects heavy metal enrichment of the vegetation in the area is more apparent, comparing with natural factors. It means that the interference by tourism activities to the environment of Taibai mountain national forest park is very obvious, especially the automobile exhaust emissions, is regarded as the impact of environmental factors which should be controlled emphatically.