首页|二氧化碳浓度增加和气候变暖导致太白山林线树木生长与氮有效性关系减弱

二氧化碳浓度增加和气候变暖导致太白山林线树木生长与氮有效性关系减弱

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全球气候变暖、大气二氧化碳浓度(Ca)升高和氮有效性正对全球森林生态系统产生深远影响,尤其是在高海拔林线地区.本研究结合树木生长指标和树轮稳定同位素指标,探讨了太白山林线树种太白红杉(Larix chinensis)对环境胁迫的生理生态响应.研究结果表明,近60年来太白红杉的生长速度显著增加,且该林线树木生长对春季温度特别敏感.太白红杉的潜在水分利用效率(iWUE)的持续上升与大气二氧化碳浓度升高和气候变暖紧密相关,共同促进了树木的生长.1851-1964年,树轮δ15N随树木生长速度的加快逐渐增大;1964年之后转变为不显著的下降,打破了原有的碳-氮平衡.分析结果表明,自20世纪60年代以来气候变暖和iWUE的迅速增加已经取代氮有效性成为树木生长的主要驱动因子.随着树木持续加速生长,氮有效性在未来可能会显著下降甚至供不应求.本研究深入揭示了植物对生长环境变化响应的生理生态机制,这将提高我们预测未来高海拔地区森林生态系统演变的能力.
Weakened relationship between tree growth and nitrogen availability due to global CO2 increase and warming in the Taibai Mountain timberline,central China
Climate warming,rising atmospheric CO2 concentration(Ca),and nitrogen(N)availability are exerting profound impacts on global forest ecosystems,particularly in high-altitude mountains.This study investigated the tree-growth dynamics of timberline Larix chinensis in the Taibai Mountain,central China,and explored its ecophysiological responses to environmental stresses by combining tree growth and stable isotopes.The results showed that the growth rate of L.chinensis has significantly increased since the 1960s,and that tree growth in this timberline was particularly sensitive to temperature in spring.Moreover,the continuously rising intrinsic water-use efficiency(iWUE),linked to higher Ca and warmer environment,promoted the growth of L.chinensis.Before the 1960s,tree-ring δ15N gradually increased,then shifted to an insignificant decline with the acceleration of tree growth,and broke the preexisting carbon-nitrogen balance.Meanwhile,climate warming and increased iWUE have replaced N as the principal drivers of tree growth since the 1960s.It is believed that L.chinensis may gradually suffer a decline in N availability as it continues to grow rapidly.The insightful understanding of the biochemical mechanisms of plant responses to growth-related environmental conditions will improve our ability to predict the evolution of high-elevation mountain ecosystems in the future.

tree ringsstable isotopesalpine forestclimate warmingCO2 fertilizationTaibai Mountain

Lelong Yin、Xiaohong Liu、Xiaomin Zeng、Ziyi Wang、Guobao Xu、Liangju Zhao、Qiangqiang Lu、Lingnan Zhang、Xiaoyu Xing

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School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119,China

State Key Laboratory of Cryospheric Sciences,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China

Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity,College of Urban and Environmental Sciences,Northwest University,Xi'an 710069,China

Key Laboratory of Soil Resource&Biotech Applications,Shaanxi Academy of Sciences,Xi'an Botanical Garden of Shaanxi Province(Institute of Botany of Shaanxi Province),Xi'an 710061,China

Qinling National Botanical Garden,Xi'an 710061,China

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树轮 稳定同位素 高山林线植被 气候变暖 CO2肥化效应 太白山

国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金中央高校基本科研业务费专项中央高校基本科研业务费专项

42330501422774484227102242301053GK202309010GK202206032

2024

10.1093/jpe/rtae001

植物生态学报(英文版)

植物生态学报(英文版)

ISSN：1752-9921
年,卷(期)：2024.(1)
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