Understanding spatio-temporal variation of autumn phenology in temperate China from 1982 to 2018

IF 2.4 3区环境科学与生态学 Q2 ECOLOGY

Frontiers in Ecology and Evolution Pub Date : 2024-01-09 DOI:10.3389/fevo.2023.1332116

Shuai Wu, Wei Wu

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引用次数: 0

Abstract

Land surface phenology plays a crucial role in accurately parameterizing interactions between land ecosystems and the atmosphere. Changes in autumn phenology directly impact the length of vegetation growing season and year-to-year changes in carbon uptake. Previous studies have often focused solely on the end of growing season when characterizing autumn phenology, neglecting the onset and duration of autumn. Here, we extracted the annual autumn phenological metrics, i.e., the start of brown-down phase (SOB), the end of brown-down phase (EOB), and the length of brown-down phase (LOB), for temperate China from 1982 to 2018 based on our self-developed global LSP dataset. We conducted a comparative analysis of SOB, EOB, and LOB in the field of their spatial distribution, temporal trends, and performance on various categories of vegetated regions (i.e., forests, grasslands, croplands, and vegetated areas in urban lands (V_Urban)). The results showed a significant negative correlation between the timing of autumn phenological metrics and latitude in temperate China. Between 1982 and 2018, there were significant positive increasing trends in EOB and LOB in V_Urban, as well as in LOB in forests in temperate China. However, the annual mean SOB, EOB, and LOB did not show significant trends across the entire study area. At the local pixel scale, SOB, EOB, and LOB exhibited a combination of advanced and delayed trends within various vegetated categories. The trends of the same phenological metric were not uniform across these diverse vegetated regions. For instance, the majority of pixels with significant trends in SOB exhibited delayed trends in forests and croplands, while displaying advanced trends in grasslands and V_Urban. In this study, employing three metrics (SOB, EOB, and LOB) to describe autumn phenology enhances our understanding of the impacts of global climate change on ecosystems, offering a more comprehensive and detailed perspective. In the future, satellite-based monitoring and phenological modeling should contemplate incorporating additional potential phenological metrics.

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了解1982-2018年中国温带地区秋季物候的时空变化

地表物候对于准确确定陆地生态系统与大气之间相互作用的参数起着至关重要的作用。秋季物候的变化直接影响植被生长季的长度和碳吸收量的逐年变化。以往的研究在描述秋季物候时往往只关注生长季的结束，而忽略了秋季的开始和持续时间。在此，我们基于自主研发的全球LSP数据集，提取了1982-2018年温带中国的年度秋季物候指标，即褐降期开始（SOB）、褐降期结束（EOB）和褐降期长度（LOB）。我们对SOB、EOB和LOB的空间分布、时间趋势以及在不同类别植被区（即森林、草地、耕地和城市土地植被区（V_Urban））的表现进行了比较分析。结果表明，中国温带地区秋季物候指标的时间与纬度之间存在明显的负相关。1982-2018年间，中国温带城市植被区（V_Urban）的EOB和LOB以及森林植被区的LOB均呈显著正增长趋势。然而，整个研究区域的年均SOB、EOB和LOB并没有表现出明显的趋势。在局部象素尺度上，SOB、EOB 和 LOB 在不同植被类别中表现出提前和延迟的综合趋势。在这些不同的植被区域中，同一物候指标的变化趋势并不一致。例如，SOB 有显著趋势的大部分像素在森林和耕地中表现出延迟趋势，而在草地和 V_Urban 中则表现出提前趋势。在本研究中，采用三个指标（SOB、EOB 和 LOB）来描述秋季物候，可增强我们对全球气候变化对生态系统影响的理解，提供一个更全面、更详细的视角。未来，卫星监测和物候建模应考虑纳入更多潜在的物候指标。

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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.