Latitudes and land use: Global biome shifts in vegetation persistence across three decades

J. Southworth, S. Ryan, H. Herrero, Reza Khatami, Erin L. Bunting, Mehedy Hassan, Carly S. Muir, P. Waylen
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引用次数: 1

Abstract

Introduction: The dynamics of terrestrial vegetation are shifting globally due to environmental changes, with potential repercussions for the proper functioning of the Earth system. However, the response of global vegetation, and the variability of the responses to their changing environment, is highly variable. In addition, the study of such changes and the methods used to monitor them, have in of themselves, been found to significantly impact the findings. Methods: This research builds on a recently developed vegetation persistence metric, which is simple to use, is user‐controlled to assess levels of statistical significance, and is readily reproducible, all designed to avoid these potential pitfalls. This study uses this vegetation persistence metric to present a global exploration of vegetation responses to climatic, latitudinal, and land‐use changes at a biomes level across three decades (1982–2010) of seasonal vegetation activity via the Normalized Difference Vegetation Index (NDVI). Results: Results demonstrated that positive vegetation persistence was found to be greater in June, July, August (JJA), and September, October, November (SON), with an increasing vegetation persistence found in the Northern Hemisphere (NH) over the Southern Hemisphere (SH). While vegetation showed positive persistence overall, this was not constant across all studied biomes. Overall forested biomes along with mangroves showed positive responses towards enhanced vegetation persistence in both the northern hemisphere and southern hemisphere. Contrastingly, desert, xeric shrubs, and savannas exhibited no significant persistence patterns, but the grassland biomes showed more negative persistence patterns and much higher variability over seasons, compared to the other biomes. The main drivers of changes appear to relate to climate, with tropical biomes linking to the availability of seasonal moisture, whereas the northern hemisphere forested biomes are driven more by temperature. Grasslands respond to moisture also, with high precipitation seasonality driving the persistence patterns. Land-use change also affected biomes and their responses, with many biomes having been significantly impacted by humans such that the vegetation response matched land use and not biome type. Discussion: The use here of a novel statistical time series analysis of NDVI at a pixel level, and looking historically back in time, highlights the utility and power of such techniques within global change studies. Overall, the findings match greening trends of other research but within a finer scale both temporally and spatially which is a critical new development in understanding global vegetation shifts.
纬度和土地利用:三十年来植被持久性的全球生物群落变化
导言:由于环境的变化,全球陆地植被的动态正在发生变化,这对地球系统的正常运作有潜在的影响。然而,全球植被的响应及其对环境变化的响应的变异性是高度可变的。此外,人们发现,对这些变化的研究和用于监测这些变化的方法本身就对研究结果产生了重大影响。方法:本研究建立在最近开发的植被持久性指标的基础上,该指标易于使用,可由用户控制以评估统计显著性水平,并且易于重复,所有这些都旨在避免这些潜在的缺陷。本研究利用植被持久性指标,通过归一化植被指数(NDVI),在30年(1982-2010)的季节植被活动中,在生物群系水平上对气候、纬度和土地利用变化的全球植被响应进行了探索。结果:6月、7月、8月(JJA)和9月、10月、11月(SON)植被持续性较好,北半球(NH)植被持续性高于南半球(SH);虽然植被总体上表现出积极的持久性,但并非在所有研究的生物群系中都是如此。在北半球和南半球,总体森林生物群落以及红树林对植被持久性的增强都表现出积极的响应。相比之下,荒漠、干旱区灌木和稀树草原没有表现出明显的持续模式,而草地生物群落表现出更多的负持续模式和更高的季节变异性。变化的主要驱动因素似乎与气候有关,热带生物群落与季节性水分的可用性有关,而北半球森林生物群落则更多地受到温度的驱动。草地对湿度也有响应,高降水季节性驱动了持续模式。土地利用变化也影响了生物群落及其响应,许多生物群落受到人类的显著影响,因此植被响应与土地利用而非生物群落类型相匹配。讨论:这里使用了一种新颖的像素级NDVI统计时间序列分析,并回顾了历史,突出了这种技术在全球变化研究中的效用和力量。总的来说,这些发现与其他研究的绿化趋势相吻合,但在时间和空间的更精细尺度上,这是理解全球植被变化的重要新进展。
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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