Response of Radial Growth of Pinus tabulaeformis to Climatic Factors in the Lingkong Mountain, Shanxi Province

doi:10.3969/j.issn.1000-6362.2020.06.003

Abstract

Abstract: In order to explore the response of Pinus tabulaeformis radial growth to climate change at different growth stages in the warm temperate subhumid zone, this paper conducted in the Lingkong Mountain of Shanxi Province,established the tree-ring standardized chronology from 1951 to 2018 in the area,and used correlation analysis to analyze tree-ring growth dynamics and its relationship with climate factors. The results showed that the tree rings of Pinus tabulaeformis contained rich and sensitive climate information, which was suitable for tree ring analysis. The response of the radial growth of Pinus tabulaeformis in different forest ages to climate was not same, and the sensitivity was in the order of over mature forest(0.354), young forest(0.338), middle age forest(0.324), near mature forest(0.308) and mature forest(0.297). The signal-to-noise ratio and the correlation coefficients of average phase of all sequences and average index of the over mature forest were larger than those of other age groups, reaching 23.803, 0.515 and 0.994, respectively. It is indicated that over mature forest was more suitable for studying ring climatology. The response function analysis showed that the young and medium forests were all sensitive to the climate factors of each month, while the near mature, mature and over-mature forests of Pinus tabulaeformis were more sensitive to precipitation and showed a significant correlation, and the correlation coefficient between radial growth and precipitation was greater than that between the young forest and the medium forest.The response function analysis showed that the radial growth of the young-aged forest has a significant negative correlation with maximum temperature and temperature amplitude in June, a significant positive correlation with minimum temperature in February and October, a significant positive correlation with precipitation in August, a significant positive correlation with the radial growth of middle-aged forest and the average lowest temperature in July, and a significant positive correlation with the temperature amplitude in January. The radial growth of near mature forest was positively correlated with precipitation in October of last year, but negatively correlated with precipitation in October of that year, and the correlation coefficient between the radial growth of Pinus tabulaeformis and precipitation in the later growth stage was greater than that of young-aged forest and middle-aged forest. The radial growth of mature forest was positively correlated with precipitation in July and August. The radial growth of over mature forest was positively correlated with precipitation in November of last year, and it had a significant negative correlation with precipitation in January and May of the same year with the correlation coefficients more than 0.7. The response of the ring width to climate variables of Pinus tabulaeformis in the Lingkong mountain was affected by age factors. Temperature and precipitation were the main factors affecting the radial growth of young and middle aged forests, while precipitation was the main factor restricting the xylem growth of near mature, mature and over mature forests.

Key words: Pinus tabulaeformis, Radial growth, Tree-ring width chronology, Rlimatic factors, Different growth stages

CLC Number:

XU Ling-ling,TONG Xiao-juan,ZHANG Jin-song,MENG Ping,WANG Xin,LI Jun. Response of Radial Growth of Pinus tabulaeformis to Climatic Factors in the Lingkong Mountain, Shanxi Province[J]. Chinese Journal of Agrometeorology, 2020, 41(06): 357-367.

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