Spatial variations in carbon dioxide fertilization effect on vegetation greening across the Tibetan Plateau

IF 4 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Global and Planetary Change Pub Date : 2025-04-21 DOI:10.1016/j.gloplacha.2025.104839

Yuan Zhang , Zhiyong Yang , Ci-ren Qu-zong , Skalsang Gyal , Wei Mazhang , Ying Yang , Guotai Zhang , Cuo Se , Danzeng Quzhen , Shiping Wang , Yongwen Liu , Julia A. Klein , Jinzhi Ding , Tsechoe Dorji

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Abstract

The impacts of shifting temperature and precipitation on vegetation dynamics in water-limited alpine ecosystems have been well-studied. However, there is a limited understanding of spatial variations in the carbon dioxide (CO₂) fertilization effect (CFE) on these systems. Here, using the MODIS normalized difference vegetation index (NDVI), meteorological and CO₂ gridded datasets from 2000 to 2022, we found that vegetation greenness showed an increasing trend in the Tibetan Plateau (TP), with a larger increasing trend in the north. Greenness changes were significantly positive correlated with temperature and precipitation in 10.13 % and 16.53 % of the TP respectively, mainly in center. In a smaller region in the southern TP, temperature and precipitation showed significant negative correlations, accounting for 2.22 % and 8.27 % of the TP respectively. Moreover, there were significantly positive relationships between greenness and CO₂ concentration in 23.69 % of the TP, suggesting that the CFE was more prevalent than the impacts of temperature and precipitation. In particular, the CFE was significant in 48.04 % of the alpine desert steppe. The spatial relationship between CFE and precipitation followed a unimodal pattern, peaking at an annual precipitation of 156 mm, and the CFE approached zero when precipitation exceeded 730 mm. In contrast, the relationship of CFE with temperature exhibited a bimodal pattern, peaking at mean annual temperatures of 2.1 °C and 12.7 °C. Their complex relationships should be closely related to the response of plant physiological processes to temperature and water. This study improved our understanding of vegetation response to global change in water-limited alpine ecosystems.

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青藏高原二氧化碳施肥对植被绿化影响的空间变异

温度和降水变化对水限高寒生态系统植被动态的影响已经得到了充分的研究。然而，人们对这些系统中二氧化碳施肥效应的空间变化了解有限。利用2000 - 2022年MODIS归一化植被指数（NDVI）、气象和CO2栅格数据，发现青藏高原植被绿度呈增加趋势，其中北部增加趋势较大。在TP的10.13%和16.53%，绿度变化与温度和降水呈显著正相关，且主要集中在中部。在南部较小区域，温度与降水呈显著负相关，分别占总TP的2.22%和8.27%。在23.69%的TP中，绿度与CO2浓度呈显著正相关，表明CFE的影响比温度和降水的影响更为普遍。其中，48.04%的高寒荒漠草原CFE显著。CFE与降水的空间关系呈单峰型，在年降水量为156 mm时达到峰值，超过730 mm时趋于零。与此相反，CFE与温度的关系呈双峰型，在年均气温2.1℃和12.7℃时达到峰值。它们之间的复杂关系应该与植物生理过程对温度和水分的反应密切相关。这项研究提高了我们对水资源有限的高山生态系统中植被对全球变化的响应的理解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Global and Planetary Change 地学天文-地球科学综合

CiteScore

7.40

自引率

10.30%

发文量

226

审稿时长

63 days

期刊介绍： The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.