Abstract
This study addressed the effects of climate drivers on the tree-ring width (TRW) parameters (total ring width (TR), earlywood width (EW) and latewood width (LW)) and the total ring δ13C series of different wood components (whole wood, α-cellulose and holocelluose) from Masson pine in subtropical China. Pairwise correlation coefficients between three ring width parameters were statistically significant. EW and LW did not reveal much stronger climate sensitivity rather than TR. This indicated that the use of intra-annual ring width has little benefit in extracting more climate information. The mean δ13C series of the three components of the total ring had the strongest climate response to the July–September relative humidity (r = −0.792 (whole wood), −0.758 (holocellulose) and −0.769 (α-cellulose)). There are no significant differences in the dendroclimatic relationships of the δ13C series of different wood components. Through both stationary temporal and spatial-statistical perspectives, the moisture drivers (summer/autumn) had a significant impact on three ring width parameters and three components of Masson pine. Overall, the radial growth and the δ13C series showed different responses to the same climate drivers during the same period. Moreover, the R-squared values of the strongest climate-proxy correlation coefficients were smaller than 50% for TRW. Consequently, the δ13C series of Masson pine may be a more representative climate proxy than TRW parameters for dendroclimatology in subtropical China.
Highlights
Subtropical China (22°–34° N, 98°–122° E) is an important socio-economic development area, with high population density and complex biodiversity [1]
The questions we addressed are as follows: (i) How about the statistical and climate sensitivity properties of different tree-ring width (TRW) parameters from Masson pine? (ii) Are there differences in the dendroclimatic relationships of the δ13C series of different wood components? (iii) Between the δ13C of the total ring and the radial growth merits, which indicator is more sensitive to climate?
The statistical characteristics of the chronologies of Masson pine tree rings are shown in table 1
Summary
Subtropical China (22°–34° N, 98°–122° E) is an important socio-economic development area, with high population density and complex biodiversity [1]. Assessing the long-term impact of climate and environmental change on forest dynamics in this region is beneficial to our work on climate disaster risk management. According to the advantages of long-term records, high resolution and wide spread, tree rings have been proven to be a useful natural archive for climate change research [4,5,6,7]. One of the most frequently studied species is Masson pine [2,8,9,10,11,12,13,14,15] It is one of the most widely distributed and abundant tree species in subtropical China [16,17]. To some extent, dendroclimatology research in subtropical China has been hampered far
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