JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2013, Vol. 37 ›› Issue (03): 29-34.doi: 10.3969/j.issn.1000-2006.2013.03.006

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Climate-growth relationships of three hardwood species and Korean pine and minimum temperature reconstruction in growing season in Dunhua, China

LI Mu, WANG Xiaochun*   

  1. Center for Ecological Research, Northeast Forestry University, Harbin 150040, China
  • Online:2013-06-18 Published:2013-06-18

Abstract: Dunhua is located at the hinterland of the Changbai Mountains in northern hemisphere high latitudes. It is one of the most significant areas of global climate change and typical broadleaved Korean pine forests in China. Three hardwood species(Fraxinus mandshurica, Juglans mandshurica and Phellodendron amurense)and Pinus koraiensis are main tree species of natural forests in this region. These species are critical to explore responses of boreal forests to climate change in northeast China. Dendrochronological methods were used to establish four standard chronologies of three hardwood species and P. koraiensis. Then, correlation analyses were made between these four chronologies and local climatic factors. The results showed that three hardwood species and P. koraiensis had similar responses to climatic factors. They were significantly and positively correlated with temperature,but was weakly correlated with precipitation. The growth of P. koraiensis was positively correlated with monthly minimum temperature in whole year, but the F. mandshurica had a strongest positively correlation with the minimum temperatures of January to October. The growth of Ph. amurense had a secondary relationship with temperature, which significantly and positively correlated with the temperature of February to September. J. mandshurica had a weak correlation with minimum temperature and it just was significantly correlated with May, June and September temperatures. In summary, temperature was the main limited factor for radial growth of broadleaved P. koraiensis forests in this region, especially for minimum temperature in growing season(April to September). Therefore, minimum temperature in growing season since 1854 in Dunhua was reconstructed by using mean chronology of three hardwoods and P. koraiensis. The reconstruction equation(Y = 4.28lnX + 8.774)explained 62.4% of the variance in minimum temperature. Segmented test proved that this reconstruction equation was stable. Variations of cool and warm periods were identical by comparing with previous studies. Reconstructed temperature of the last 158 years in this region showed there were three warmer periods(1860-1873, 1938-1947 and 1991-2010)and three cooler periods(1888-1933, 1965-1971 and 1977-1980)and warming up in last 30 years. There a minimum temperature change cycle were 8.4, 6.9-6.3, 3.7, 2.5 and 2.2 a in Dunhua.

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