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Indicator of climate variability:low treeline displacement in arid valleys of mountain areas,China

Journal of Mountain Science 2023年第11期20卷 3250-3265页

作者： YAN Wei-po WANG Qing GUO Ya-lin HU Qi YANG Min AN Yi-da School of Environment and Resource Southwest University of Science and TechnologyMianyang 621010China Sichuan Academy of Environmental Policy and Planning Chengdu 610041China

As climate change intensifies,finding an ecological indicator to quickly and accurately reflect the impact on mountain ecosystems is *** low treeline/timberline,highly sensitive to climate variability and changes significantly within 5–10years,provides a new way to study the response to regional climate *** study explored the distribution and vertical displacement patterns of the low treeline in the Upper Minjiang River of China,using SPOT remote sensing images in 1999 and 2013and long-term positional *** the Geodetector model,the study investigated the dominant climatic factors influencing the low treeline *** results showed that the low treeline was located at 1700–3200 m elevation on sunny slopes(southeast,south,southwest,and west slopes)with slopes over 25°.From 1999 to 2013,the low treeline moved downward by 6 m from 2561±264m to 2555±265 m,along with a warm–humid climate *** downward displacement was greater on slopes over 25°and shady slopes(-20 m and-10 m,respectively)than on slopes≤25°and sunny ***,the downward was greater in the warm and humid Zagunao River Basin(-15 m)compared to the arid valley center(-7 m)and the cold Heishui River Basin(-3 m).Meanwhile,the low treeline displacement correlated negatively with precipitation and relative humidity variations at the significance level of 0.05,with correlation coefficients of-0.572and-0.551,*** in relative humidity and temperature significantly affected the spatial differentiation of low treeline displacement with influencing power of 0.246(p=0.036low treeline is a moisture-limited line,and its formation and variation are closely related to regional water–heat *** study clarifies the indicative value of the low treeline for climate variability in mountain areas and can provide references for ecological restoration in arid valleys.

关键词： low treeline Moisture-limited line Climate variability Remote sensing interpretation Geo-detector Arid valley

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