| Climate is the average state of the atmospheric physical characteristics inside a certain period of an area; its changes can be traced back to the ancient period. The so-called climate variation means the average state of climate changes as time goes, which based on some or all of the features related to the average weather conditions, such as changes in temperature, precipitation and other factors to measure. Major variation in the global climate could have a significant impact on global ecological environment and human society, which could threaten human survival environment, so the research of global climate variation has important significance to protect the earth ecology and survival environment for human.Dendroclimatology is a methodological science through studying rules of variation of tree rings, so that we could reconstruct and evaluate rules of climate changes from past to present. The formation of tree-ring is closely bound up with climate variation. The formation of tree-ring is related to mutation genetic factors as well as the environmental factors, variation of tree-ring width and density can reflect the change of external environment. In the early 19th century, scientists have tried to establish the correlation between variation of tree-ring width and climate variation. Recently, the research of tree-ring width has been widely used in the establishment of tree-ring width chronology and the historical reconstruction of temperature, precipitation and humidity and so on. Nowadays the application of tree-ring information for climate change research has become one of the most important means of climate variation research.As a applied subject of dendrochronology, dendroclimatology continued the research methods of dendrochronology climatology, one is the analysis of tree-ring density while another one is the analysis of tree-ring width. Theoretical system of international tree-ring climatology is almost completed. However, due to late start in the field of the research and the lack of techniques in our country, our research is relatively backward. We still need to speed up the pace of research of dendroclimatology. This study firstly expounds the basic principle and technical methods of dendroclimatology, and then it introduces the progress of the study of climate variation through applying dendroclimatology. Then, we briefly discussed what we should and could do to strengthen our research of dendroclimatology. In order to investigate the reliability of the research on the response between young tree’s tree-ring width and climatic conditions in the moist hilly region in southern China, at the same time to reveal the general rule of climate variation and its effects on the growth of trees over the past in this region, this paper demonstrated the establishment of Pinus Massoniana tree-ring chronology and discussed the relationship between Pinus Massoniana tree-ring chronology and climatic conditions from taking the three sampling tree-ring width sites in the northeast of Yang Ming Mountain that a regional tree-ring chronology for 36 years was established. The study results that the changes in regional tree-ring width of three sampling sites in Yang Ming Mountain are closely correlated with the local climatic conditions. Radial growth of Pinus Massoniana is significantly positive correlated with the mean temperature of the current year from January to May (the coefficient 0.596, P0.01) and there are significant positive correlation between radial growth of Pinus Massoniana and the mean temperature of the previous year from June to July (the coefficient 0.639, P0.01). The effect of precipitation on the radial growth of Pinus Massoniana is mainly in "hysteresis effect" that the radial growth of Pinus Massoniana is closely negative correlated with the total precipitation of the previous year from January to March and November to December (the coefficient -0.46, P0.05), so well as the total precipitation of the previous year from June to July (the coefficient -0.582, P0.05). |
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