青藏高原东缘岷江冷杉径向生长对升温响应分异的坡向和海拔差异

doi:10.11707/j.1001-7488.LYKX20220387

Abstract

Abstract:

Objective: Minjiang fir (Abies fargesii var. faxoniana) is an endemic and dominant tree species in the eastern Tibetan Plateau (TP). This paper aims to study the spatial correlation of the divergence phenomenon of Minjiang fir with slope aspect and elevation and to explore its driving force, so as to provide a scientific basis for climate reconstruction and predict distributions of natural forests in southwestern China. Method: In the Miyaluo Forest Region on the eastern margin of TP, a total of 875 tree cores of Minjiang fir were collected from four main distribution slope aspects (NE, N, NW, and W) and three elevation gradients (3 650, 3 800, and 3 950 m). After the growth trend of the tree ring was removed using dendrochronology, twelve tree ring standard chronologies of Minjiang fir were established based on terrain points. The regression analysis was used to study the divergence between the tree-ring index of Minjiang fir and the warming trend. The Pearson correlation analysis and sliding correlation analysis were used to reveal the relationships between the tree-ring index of Minjiang fir and climate factors from 1955 to 2019. Result: 1) There was no divergence in the radial growth of Minjiang fir in treelines of the four slope aspects, and the Minjiang fir trees on the west slope did not take place divergence. The tree-ring index of Minjiang fir on the N and NW slope aspects at the low and middle elevations and the NE slope at the low elevation showed divergence patterns with the warming trend. 2) Among the five diverged plots, the radial growth of Minjiang fir on the north slope at middle and low elevations as well as the northwest slope at low elevation showed a negative correlation with the precipitation during the growing season (June) (P<0.05). Minjiang fir on the N and NW slope at the middle elevation were negatively correlated with the precipitation in September and the temperature in October of the previous year, respectively (P<0.05). Tree ring indices of Minjiang fir on the N slope at the low elevation showed a negative correlation with the temperature in April and September (P<0.05). 3) From 1955 to 2019, the negative correlation between the tree-ring index of Minjiang fir on the middle elevation N slope and precipitation in September and June of the previous year tended to be significant (P<0.05). The negative correlation between the tree-ring index of Minjiang fir on low elevation N slope and the temperature in April and September tended to be significant, and the negative correlation with precipitation in June tended to be significant (P<0.05). A stable significant positive correlation was maintained between the tree-ring index of Minjiang fir on middle elevation NW slope and the mean temperature in October of the previous year (P<0.05). On the low-elevation NW slope, the negative correlation between the tree-ring index and precipitation in June tended to be significant (P<0.05), and the relationship with the mean temperature in June tended to be uncorrelated. The negative correlation between the tree-ring index of Minjiang fir on low altitude NE slope and the mean temperature in September, October, and December of the previous year, and in January, May, and September tended to be significant (P<0.05). Conclusion: The divergence phenomenon of Minjiang fir occurs at lower elevations on the south-facing slopes (NE and W) rather than on the north-facing slopes (N and NW). The drought stress on Minjiang fir occurs in the previous year's late growing season and the current year's non-growing season. Under the background of future warming, the growth response of Minjiang fir at the lower elevations is uncertain, but the radial growth of Minjiang fir trees in the treelines will be beneficial from warming.

Key words: Abies fargesii var. faxoniana, climate change, divergence phenomenon, slope aspect, elevation

CLC Number:

Panpan Xue,Ning Miao,Ximing Yue,Qiong Tao,Yuandong Zhang,Qiuhong Feng,Kangshan Mao. Divergence Phenomenon of Radial Growth of Minjiang Fir in Response to Warming at Different Slope Aspects and Elevations on the Eastern Margin of the Tibetan Plateau[J]. Scientia Silvae Sinicae, 2023, 59(7): 65-77.

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采样点 Sampling sites	坡向 Aspects	坡度 Slope/ (°)	经度 Longitude (E)/(°)	纬度 Latitude (N)/(°)	海拔 Altitude/m
W-H-1	西坡 West slope	27~30	102.696 5	31.837 7	3 950
W-M-1			102.692 8	31.831 6	3 800
W-L-1			102.690 5	31.832 5	3 650
W-H-2			102.698 1	31.837 0	3 960
W-M-2			102.695 9	31.837 8	3 820
W-L-2			102.693 0	31.839 2	3 660
NW-H-1	西北坡 Northwest slope	27~30	102.707 3	31.867 4	3 980
NW-M-1			102.733 9	31.869 1	3 812
NW-L-1			102.731 6	31.870 3	3 655
NW-H-2			102.732 6	31.862 8	3 987
NW-M-2			102.729 9	31.865 1	3 819
NW-L-2			102.728 0	31.866 8	3 680
N-H-1	北坡 North slope	27~30	102.672 5	31.834 2	4 008
N-M-1			102.675 7	31.835 2	3 871
N-L-1			102.678 5	31.835 1	3 719
N-H-2			102.669 9	31.834 6	4 010
N-M-2			102.672 6	31.836 1	3 849
N-L-2			102.676 7	31.836 9	3 705
NE-H-1	东北坡Northeast slope	27~30	102.798 8	31.634 1	3 965
NE-M-1			102.799 8	31.636 4	3 815
NE-L-1			102.805 7	31.635 2	3 660
NE-H-2			102.799 9	31.636 4	3 968
NE-M-2			102.799 4	31.636 4	3 810
NE-L-2			102.905 7	31.635 2	3 650

采样点Sites	采样数量/样本量Tree/series	时间跨度Time span	MS	SD	AC1	EPS	SNR	PC1(%)
W-H	76/50	1802—2020	0.089	0.159	0.744	0.940	15.533	28.74
W-M	70/37	1699—2020	0.120	0.255	0.776	0.924	12.078	34.25
W-L	74/35	1820—2020	0.136	0.264	0.833	0.880	7.367	26.72
NW-H	74/50	1823—2020	0.120	0.200	0.674	0.946	17.679	34.43
NW-M	74/42	1836—2020	0.112	0.196	0.721	0.959	23.258	49.53
NW-L	71/38	1927—2020	0.111	0.288	0.811	0.913	10.504	39.96
N-H	74/45	1815—2020	0.119	0.186	0.685	0.964	26.782	46.90
N-M	70/43	1811—2020	0.106	0.160	0.639	0.942	16.323	37.98
N-L	73/36	1938—2020	0.089	0.120	0.602	0.931	13.443	35.70
NE-H	72/43	1785—2020	0.115	0.178	0.685	0.935	14.341	35.95
NE-M	74/33	1809—2020	0.112	0.189	0.716	0.890	8.064	33.91
NE-L	73/51	1720—2020	0.101	0.136	0.565	0.876	7.068	22.99

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Divergence Phenomenon of Radial Growth of Minjiang Fir in Response to Warming at Different Slope Aspects and Elevations on the Eastern Margin of the Tibetan Plateau

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