Ignoring previous water conditions underestimates global terrestrial ecosystem productivity in severely arid vegetation regions

IF 4 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Global and Planetary Change Pub Date : 2025-03-17 DOI:10.1016/j.gloplacha.2025.104799

Jingyu Zeng , Tao Zhou , E. Tan , Ying Yu , Yajie Zhang , Xuemei Wu , Jingzhou Zhang , Yancheng Qu , Qi Zhang

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引用次数: 0

Abstract

In the context of global climate change, changes in water conditions significantly affect the productivity of terrestrial ecosystems. However, the impact of previous water conditions has not received sufficient attention. Using machine learning and a large amount of global ground observation data, we evaluated the impact of previous water conditions at various time scales on global productivity estimation through paired experiments and residual comparison methods. By incorporating run theory, we investigated the uncertainty introduced by neglecting previous water conditions in estimating ecosystem productivity across various levels of vegetation drought frequency, intensity, duration, and severity. We found that 36.8 % of global net primary productivity (NPP) is predominantly influenced by water conditions over the previous 24 months, a percentage higher than those observed at 6, 12, and 18-month time. Considering previous water conditions, the estimated global productivity was 66.72 Pg C yr⁻¹ (468.98 g C m⁻² yr⁻¹). Neglecting previous water conditions may lead to an underestimation of global productivity by up to 1.27 Pg C(p < 0.05). Regions experiencing severe, prolonged, and intense drought may have significant NPP estimation biases without considering previous water conditions. This study provides an important step toward understanding the impact of previous water conditions and vegetation drought disasters on the carbon sink function of global terrestrial ecosystems.

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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.