天水麦积山油松树轮宽度对气候变化的响应及其机制

doi:10.13866/j.azr.2023.01.03

Abstract

Abstract:

In recent decades, an unusual reduction in forest radial growth and temperature sensitivity has been widely observed in the northern high latitudes. Several studies have also suggested that unstable and nonlinear relationships exist between tree growth and its climatic drivers at mid-latitudes and even globally. However, this relationship remains poorly understood, particularly in the mid-latitudes. The climate response and growth process before and after the temperature abrupt change were investigated using dendroclimatological methods and the Vaganov-Shashkin model in order to research the variations and mechanisms of response of radial growth of Pinus tabulaeformis to climate factors in Maijishan Mountain, Tianshui, during 1980-2019. The findings revealed that: (1) According to the Mann-Kendall test, temperature changed abruptly in 1997 and then increased significantly. During 1980-1997 and 1998-2019, there were three patterns of response in radial growth to climate factors revealed in the variation in correlation with climatic factors: decline (Temperature in May), increase (Temperature and precipitation in October, precipitation in July and temperature in December), and fluctuation (Precipitation in June and temperature in July). (2) The Vaganov-Shashkin model estimated chronologies are significantly correlated with the measured tree-ring chronologies before and after the abrupt change (P<0.05). According to simulation results, significant climate warming resulted in more abundant heat supply for growth in spring and autumn, thereby significantly extending the growing season and potentially causing a change in response patterns in May and October. Furthermore, summer high temperatures and water scarcity impacted growth, potentially leading to a change in response patterns in July. (3) The change in response patterns to climate factors is primarily caused by climate warming and the lengthening of the growing season. If the climate continues to warm, the response patterns are expected to change, even more, and similar behavior may exist in other areas where the species is found.

Key words: tree-ring, climate change, Vaganov-Shashkin model, Pinus tabulaeformis, Maijishan Mountain

YAO Daijun, LIU Kang, HUI Yuxiang, WANG Kaixin. The response and mechanism of Pinus tabulaeformis tree-ring width to climate change in Maijishan Mountain, Tianshui, China[J].Arid Zone Research, 2023, 40(1): 19-29.

Figures/Tables 13

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References 31

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年表统计项	数值	公共区间分析	数值
年表研制样本量	30	公共区间	1993—2020年
序列长度	1947—2020年	所有样芯平均相关系数	0.321
指数均值	0.956	树间平均相关系数	0.315
标准差	0.209	树内平均相关系数	0.550
平均敏感度	0.235	信噪比	14.173
一阶自相关系数	0.234	总体代表性	0.934
		第一主成分解释量	0.377

参数	描述	值
T₁	生长最低气温/℃	5
T₂	最适生长气温下限/℃	15
T₃	最适生长气温上限/℃	23
T₄	生长最高气温/℃	33
W_o	初始土壤湿度	0.225
P_max	饱和土壤的最大日降水量/mm	82
l_r（Droot）	根深/mm	1600
C₂（K₂）	蒸腾作用第一系数	0.1175
C₃（K₃）	蒸腾作用第二系数	0.185
C₁（K₁）	降水渗透到土壤的系数（未被截流的系数）	0.74
W₁	生长最低土壤含水量（与饱和土壤含水量比）	0
W₂	最适生长土壤含水量下限	0.475
W₃	最适生长土壤含水量上限	0.725
W₄	植物生长最高湿度（与饱和含水量比）	0.95
C_d(K_d)	土壤排水系数	0.001
T_g(T_beg)	植物开始生长时的积温/℃	10

The response and mechanism of Pinus tabulaeformis tree-ring width to climate change in Maijishan Mountain, Tianshui, China

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