Relationship between the rainfall and some physicochemical criteria in the tree rings of Fokienia in Lao Cai

Abstract

The rings of long-lived trees have been regarded as a special database which represents the change of atmospheric environment relating to the expressions of weather and air quality. In addition, the tree rings are also an effective tool for many scientists in the world to research and evaluate the level and speed of climate change. This paper presents the research results of the true correlation between the amount of rainfall and width of rings, and the research also demonstrates that the correlation coefficient is R2 = 0.62 with the p-value as 0.04. Moreover, there exists an inverse correlation between the amount of rainfall and the density, between the amount of rainfall and the total N with the correlation coefficient R2 = 0.79, p-value as 0.04 and R2 = 0.81, p-value as 0.04. As a result, there is a special relation between the amount of the rainfall and physicochemical elements of the tree rings; it reflects the changes of rainfall. Based on this relation, the authors can create an equation which shows the correlation between the amount of rainfall and physicochemical elements of Fokienia rings with the p-value as 0.05.