
Response of Radial Growth and Xylem Anatomical Characteristics of Fraxinus mandshurica Families to Low Temperature Event in Xiaoxing'an Mountains
CHEN Manju, ZENG Fansuo, ZHAN Yaguang, MA Hui, ZHANG Chenchen, LIU Ye, XIN Ying
Response of Radial Growth and Xylem Anatomical Characteristics of Fraxinus mandshurica Families to Low Temperature Event in Xiaoxing'an Mountains
Fraxinus mandshurica is one of the precious broadleaf tree species in Northeast China. It has high economic and ecological value.There′s a shortage of F. mandshurica resources and a structural deficiency in resilient cultivars. It′s particularly important to select and breed F. mandshurica with excellent cold resistance in the context of global climate change. The F. mandshurica in Xiaoxing'an Mountains of Heilongjiang Province were selected as the reseach objects. Dendrochronology and wood anatomy were used to compare the radial growth of 52 F. mandshurica families(Families 1-77 in total). The relationship between the radial growth and xylem anatomical characteristics of F. mandshurica and main climatic factors was clarified. The response of F. mandshurica families to low temperature event was studied. The results showed that there were significant differences in average annual radial growth of F. mandshurica families in Xiaoxing'an Mountains. The radial growth of No. 56, 46 and 38 F. mandshurica families were higher, the values were 4.07 mm, 3.82 mm and 3.71 mm, respectively. The radial growth of F. mandshurica was constrained by temperature and precipitation during the growing season. The radial growth was significantly negatively correlated with the temperature in October of the previous year, positively correlated with the temperature from January to April, and negatively correlated with the precipitation from March to April. Temperature was the primary climatic factor affecting xylem anatomical features of F. mandshurica families in Xiaoxing'an Mountains. Under low temperature stress, the ring width(RW), mean vessel area (MVA), total vessel area(TVA) and theoretical hydraulic conductivity(Kh) decreased by 25.5%, 38.2%, 21.8% and 55.1%, compared with non-low temperature years, while vessel density(VD) increased by 64.1%. There was difference in radial growth among F. mandshurica families under low temperature stress. No. 39, 70 and 36 families had stronger resistance to cold, the values of resistance were greater than 1. The recovery of No. 57, 17 and 70families were better, the values of recovery were higher than 1.63. The No.70 F. mandshurica family in Xiaoxing'an Mountains had excellent growth and stronger cold resistance, which could be used as an excellent F. mandshurica family for directional cultivation.
Fraxinus mandshurica / radial growth / wood anatomy / low temperature / ecological resilience
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