Spatiotemporal changes of gross primary productivity and its response to drought in the Mongolian Plateau under climate change

IF 2.7 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Xuqin Zhao, Min Luo, Fanhao Meng, Chula Sa, Shanhu Bao, Yuhai Bao
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Abstract

Gross primary productivity (GPP) of vegetation is an important constituent of the terrestrial carbon sinks and is significantly influenced by drought. Understanding the impact of droughts on different types of vegetation GPP provides insight into the spatiotemporal variation of terrestrial carbon sinks, aiding efforts to mitigate the detrimental effects of climate change. In this study, we utilized the precipitation and temperature data from the Climatic Research Unit, the standardized precipitation evapotranspiration index (SPEI), the standardized precipitation index (SPI), and the simulated vegetation GPP using the eddy covariance-light use efficiency (EC-LUE) model to analyze the spatiotemporal change of GPP and its response to different drought indices in the Mongolian Plateau during 1982–2018. The main findings indicated that vegetation GPP decreased in 50.53% of the plateau, mainly in its northern and northeastern parts, while it increased in the remaining 49.47% area. Specifically, meadow steppe (78.92%) and deciduous forest (79.46%) witnessed a significant decrease in vegetation GPP, while alpine steppe (75.08%), cropland (76.27%), and sandy vegetation (87.88%) recovered well. Warming aridification areas accounted for 71.39% of the affected areas, while 28.53% of the areas underwent severe aridification, mainly located in the south and central regions. Notably, the warming aridification areas of desert steppe (92.68%) and sandy vegetation (90.24%) were significant. Climate warming was found to amplify the sensitivity of coniferous forest, deciduous forest, meadow steppe, and alpine steppe GPP to drought. Additionally, the drought sensitivity of vegetation GPP in the Mongolian Plateau gradually decreased as altitude increased. The cumulative effect of drought on vegetation GPP persisted for 3.00–8.00 months. The findings of this study will improve the understanding of how drought influences vegetation in arid and semi-arid areas.

气候变化下蒙古高原总初级生产力的时空变化及其对干旱的响应
植被总初级生产力(GPP)是陆地碳汇的重要组成部分,受干旱影响很大。了解干旱对不同类型植被总初级生产力的影响,有助于深入了解陆地碳汇的时空变化,从而帮助减轻气候变化的不利影响。本研究利用气候研究单位的降水和温度数据、标准化降水蒸散指数(SPEI)、标准化降水指数(SPI)以及利用涡度协方差-光利用效率(EC-LUE)模型模拟的植被GPP,分析了1982-2018年蒙古高原植被GPP的时空变化及其对不同干旱指数的响应。主要研究结果表明,50.53%的高原地区(主要是北部和东北部地区)植被GPP下降,而其余49.47%的地区植被GPP上升。具体而言,草甸草原(78.92%)和落叶林(79.46%)的植被 GPP 显著下降,而高山草原(75.08%)、耕地(76.27%)和沙地植被(87.88%)则恢复良好。气候变暖干旱区占 71.39%,严重干旱区占 28.53%,主要分布在南部和中部地区。值得注意的是,荒漠草原(92.68%)和沙地植被(90.24%)的气候变暖干旱区显著。气候变暖放大了针叶林、落叶林、草甸草原和高山草原 GPP 对干旱的敏感性。此外,随着海拔的升高,蒙古高原植被 GPP 对干旱的敏感性逐渐降低。干旱对植被 GPP 的累积效应持续了 3.00-8.00 个月。这项研究的结果将加深人们对干旱如何影响干旱和半干旱地区植被的认识。
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来源期刊
Journal of Arid Land
Journal of Arid Land ENVIRONMENTAL SCIENCES-
CiteScore
4.70
自引率
6.70%
发文量
768
审稿时长
3.2 months
期刊介绍: The Journal of Arid Land is an international peer-reviewed journal co-sponsored by Xinjiang Institute of Ecology and Geography, the Chinese Academy of Sciences and Science Press. It aims to meet the needs of researchers, students and practitioners in sustainable development and eco-environmental management, focusing on the arid and semi-arid lands in Central Asia and the world at large. The Journal covers such topics as the dynamics of natural resources (including water, soil and land, organism and climate), the security and sustainable development of natural resources, and the environment and the ecology in arid and semi-arid lands, especially in Central Asia. Coverage also includes interactions between the atmosphere, hydrosphere, biosphere, and lithosphere, and the relationship between these natural processes and human activities. Also discussed are patterns of geography, ecology and environment; ecological improvement and environmental protection; and regional responses and feedback mechanisms to global change. The Journal of Arid Land also presents reviews, brief communications, trends and book reviews of work on these topics.
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