水汽压差对中国植被生长的影响

IF 2.7 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Journal of Arid Land Pub Date : 2024-05-17 DOI:10.1007/s40333-024-0077-0
Chuanhua Li, Liang Zhang, Hong Wang, Lixiao Pend, Peng Yin, Peidong Miao
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引用次数: 0

摘要

蒸气压差(VPD)在决定植物生理功能方面起着至关重要的作用,对植被的影响仅次于二氧化碳(CO2)。作为大气需水量的可靠指标,VPD 对全球水资源具有重要影响,其意义还延伸到生态系统的结构和功能。然而,在中国,VPD 对气候变化下植被生长的影响尚不明确。本研究基于气候研究单位(CRU)时间序列 4.6 版(TS4.06)和欧洲中期天气预报中心(ECMWF)再分析 5(ERA-5)的气象再分析数据,采用经验方程估算了中国 2000 至 2020 年的 VPD。植被生长状况通过三个植被指数来描述,即总初级生产力(GPP)、叶面积指数(LAI)和植被近红外反射率(NIRv)。利用 Theil-Sen 中位趋势分析和 Mann-Kendall 检验分析了 VPD 和植被指数的时空动态。此外,还利用多元线性回归模型评估了 VPD 对植被生长的影响及其相对贡献。结果表明,VPD 与植被指数之间总体呈负相关。VPD与植被指数之间的相关性有三个VPD区间:VPD低于4.820 hPa时呈显著正相关,VPD在4.820-9.000 hPa范围内呈显著负相关,VPD高于9.000 hPa时负相关明显减弱。VPD对植被生长有明显的负面影响,其绝对值超过了温度、降水和太阳辐射。二氧化碳对植被生长的积极影响最大,VPD 抵消了二氧化碳约 30.00% 的积极影响。随着 VPD 上升速度的减慢,其对植被生长的相对贡献也在减小。此外,气温和降水的空间变化加剧,加剧了 VPD 对中国植被生长影响的空间异质性。这项研究为中国应对气候变化,尤其是应对VPD上升带来的挑战提供了理论依据。
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Influence of vapor pressure deficit on vegetation growth in China

Vapor pressure deficit (VPD) plays a crucial role in determining plant physiological functions and exerts a substantial influence on vegetation, second only to carbon dioxide (CO2). As a robust indicator of atmospheric water demand, VPD has implications for global water resources, and its significance extends to the structure and functioning of ecosystems. However, the influence of VPD on vegetation growth under climate change remains unclear in China. This study employed empirical equations to estimate the VPD in China from 2000 to 2020 based on meteorological reanalysis data of the Climatic Research Unit (CRU) Time-Series version 4.6 (TS4.06) and European Centre for Medium-Range Weather Forecasts (ECMWF) Reanalysis 5 (ERA-5). Vegetation growth status was characterized using three vegetation indices, namely gross primary productivity (GPP), leaf area index (LAI), and near-infrared reflectance of vegetation (NIRv). The spatiotemporal dynamics of VPD and vegetation indices were analyzed using the Theil-Sen median trend analysis and Mann-Kendall test. Furthermore, the influence of VPD on vegetation growth and its relative contribution were assessed using a multiple linear regression model. The results indicated an overall negative correlation between VPD and vegetation indices. Three VPD intervals for the correlations between VPD and vegetation indices were identified: a significant positive correlation at VPD below 4.820 hPa, a significant negative correlation at VPD within 4.820–9.000 hPa, and a notable weakening of negative correlation at VPD above 9.000 hPa. VPD exhibited a pronounced negative impact on vegetation growth, surpassing those of temperature, precipitation, and solar radiation in absolute magnitude. CO2 contributed most positively to vegetation growth, with VPD offsetting approximately 30.00% of the positive effect of CO2. As the rise of VPD decelerated, its relative contribution to vegetation growth diminished. Additionally, the intensification of spatial variations in temperature and precipitation accentuated the spatial heterogeneity in the impact of VPD on vegetation growth in China. This research provides a theoretical foundation for addressing climate change in China, especially regarding the challenges posed by increasing VPD.

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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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