Effects of preseason climate change on spring and summer phenological shifts in Inner Mongolian grasslands

IF 2.4 3区环境科学与生态学 Q2 ECOLOGY

Frontiers in Ecology and Evolution Pub Date : 2024-08-29 DOI:10.3389/fevo.2024.1423063

Zexu Nie, Chao Wang, Na Zhang

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Abstract

Grassland vegetation phenology has undergone great changes under the influence of climate, which affects ecosystem functions and services. However, the mechanism of preseason climatic factors in driving phenological shifts is unclear. In this study, we determined the start (SOS) and peak (POS) of the growing season for Inner Mongolian grasslands using gross primary productivity data (2000–2018). We investigated the spatiotemporal changes of SOS and POS and elucidated the mechanisms behind these changes by analyzing how these phenological events were influenced by the specific preseason climatic requirements (precipitation, air temperature, and solar radiation). Our results revealed that the SOS significantly advanced at a rate of 0.65 days/a, while the POS was stable across the study area. At the pixel scale, areas with initially later SOS and POS exhibited stronger advanced trends. An earlier SOS and POS were associated with lower thermal requirements, including air temperature and solar radiation. Conversely, a delayed SOS and POS necessitated higher climatic requirements. The impact of preseason precipitation on both SOS and POS demonstrated notable spatial variability. Moreover, the effects of different climatic factors on phenology were not in sync due to regional environmental disparities. Our study provides insight into the mechanisms underlying phenological shifts in grassland ecosystems under climate change.

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季前气候变化对内蒙古草原春夏物候变化的影响

受气候影响，草原植被物候发生了巨大变化，从而影响了生态系统的功能和服务。然而，季节性气候因素对物候变化的驱动机制尚不清楚。在本研究中，我们利用总初级生产力数据（2000-2018 年）确定了内蒙古草原生长季的起始期（SOS）和高峰期（POS）。我们研究了 SOS 和 POS 的时空变化，并通过分析这些物候事件如何受特定季前气候要求（降水、气温和太阳辐射）的影响，阐明了这些变化背后的机制。我们的研究结果表明，在整个研究区域内，SOS 以 0.65 天/年的速度明显提前，而 POS 则保持稳定。在像素尺度上，SOS 和 POS 最初较晚的地区表现出更强的提前趋势。较早的 SOS 和 POS 与较低的热要求有关，包括空气温度和太阳辐射。相反，SOS 和 POS 推迟则需要更高的气候要求。季前降水对 SOS 和 POS 的影响表现出明显的空间差异性。此外，由于地区环境差异，不同气候因子对物候的影响并不一致。我们的研究有助于深入了解气候变化下草原生态系统物候变化的内在机制。

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

Frontiers in Ecology and Evolution Environmental Science-Ecology

CiteScore

4.00

自引率

6.70%

发文量

1143

审稿时长

12 weeks

期刊介绍： Frontiers in Ecology and Evolution publishes rigorously peer-reviewed research across fundamental and applied sciences, to provide ecological and evolutionary insights into our natural and anthropogenic world, and how it should best be managed. Field Chief Editor Mark A. Elgar at the University of Melbourne is supported by an outstanding Editorial Board of international researchers. This multidisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers, academics and the public worldwide. Eminent biologist and theist Theodosius Dobzhansky’s astute observation that “Nothing in biology makes sense except in the light of evolution” has arguably even broader relevance now than when it was first penned in The American Biology Teacher in 1973. One could similarly argue that not much in evolution makes sense without recourse to ecological concepts: understanding diversity — from microbial adaptations to species assemblages — requires insights from both ecological and evolutionary disciplines. Nowadays, technological developments from other fields allow us to address unprecedented ecological and evolutionary questions of astonishing detail, impressive breadth and compelling inference. The specialty sections of Frontiers in Ecology and Evolution will publish, under a single platform, contemporary, rigorous research, reviews, opinions, and commentaries that cover the spectrum of ecological and evolutionary inquiry, both fundamental and applied. Articles are peer-reviewed according to the Frontiers review guidelines, which evaluate manuscripts on objective editorial criteria. Through this unique, Frontiers platform for open-access publishing and research networking, Frontiers in Ecology and Evolution aims to provide colleagues and the broader community with ecological and evolutionary insights into our natural and anthropogenic world, and how it might best be managed.