Altitudinal Difference of Growth–Climate Response Models in the Coniferous Forests of Southeastern Tibetan Plateau, China

Author:

Xu Shanshan1ORCID,Zheng Chaogang1ORCID,Zhang Zhigang123,Shang Zhiyuan123ORCID,Kong Xinggong123,Zhao Zhijun123

Affiliation:

1. School of Geography, Nanjing Normal University, Nanjing 210023, China

2. Jiangsu Centre for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China

3. Key Laboratory of Virtual Geographic Environment, Ministry of Education of China, Nanjing 210023, China

Abstract

Characterized as a climatologically sensitive region, the southeastern Tibetan Plateau (STP) is an ideal location for dendrochronological research. Here, five tree-ring width (TRW) chronologies were developed: three for Picea likiangensis along altitudinal gradients from 3600 to 4400 m a.s.l. and two for Sabina saltuaria and Abies squamata from 4200 m a.s.l. Significant differences in the growth rates and age composition of Picea likiangensis were observed at various elevation gradients. The chronology statistics (mean sensitivity, etc.) fluctuated with the elevation gradient. Picea likiangensis showed distinct growth patterns in response to climatic variability along the altitude gradient: the minimum temperature influenced tree growth at lower and middle altitudes, while higher altitudes were affected by precipitation. The radial growth of different tree species growing in the same region is controlled by the same climatic factors. Sabina saltuaria and Abies squamata exhibited similar growth responses to Picea likiangensis. Stand conditions (wind speeds, slope, and elevation) and biotic factors (the depth of root, forest type, tree age, and sensitivity) can partially explain why the ring width–climate relationships change with altitude.

Funder

National Natural Science Foundation of China

Strategic Priority Research Program (A) of the Chinese Academy of Sciences

Second Tibetan Plateau Scientific Expedition Program

Publisher

MDPI AG

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