Coastal morphodynamics and Holocene environmental changes in the Pearl River Delta, southern China: New evidence from palynological records

Hao, Xin; Li, Lixue; Ouyang, Xuhong; Culligan, Nicholas; Hu, Baoqing; Zhao, Xinquan; Chen, Shuangxi

doi:10.1016/j.geomorph.2021.107846

Cited by 8 publications

(10 citation statements)

References 61 publications

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“…However, from the LGM to the Holocene, the climate became progressively warmer, with an increase in temperature by about 4−5°C (Li et al., 2019; Marcott et al., 2013; Wang et al., 2014), probably contributing to the contraction of L. elongata distribution from widespread to mountainous areas (Figure 4b). Moreover, human disturbance before the Holocene was relatively weak in East Asia; rice domestication was not yet documented (Dong et al., 2020; Hao et al., 2021; Lu, 2017; Zuo et al., 2017). We inferred from these results that climate change, rather than anthropogenic activities, potentially resulted in the population decline for some clades of L. elongata from the LGM to the Holocene, which is consistent with the radiocarbon and optically stimulated luminescence evidence (Dong et al., 2020).…”

Section: Discussionmentioning

confidence: 99%

“…Anthropogenic activities have been going on more than 10,000 years ago in southeastern China (Hao et al., 2021; Lu, 2017; Zuo et al., 2017). Therefore, we downloaded the historical area change of cropland and irrigated rice area and human population change in the last 11,000 years from the HYDE database 3.2 (Goldewijk et al., 2017) and calculated the correlation between the historical area change of these variables and historical N e dynamics of L. elongata with Spearman statistics.…”

Section: Methodsmentioning

confidence: 99%

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Anthropogenic disturbance driving population decline of a dominant tree in East Asia evergreen broadleaved forests over the last 11,000 years

Qin,

Zuo,

et al. 2023

Conservation Biology

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Current biodiversity loss is generally considered to have been caused by anthropogenic disturbance, but it is unclear when anthropogenic activities began to affect biodiversity loss. One hypothesis suggests it began with the Industrial Revolution, whereas others propose that anthropogenic disturbance has been associated with biodiversity decline since the early Holocene. To test these hypotheses, we examined the unique vegetation of evergreen broadleaved forests (EBLFs) in East Asia, where humans have affected landscapes since the early Holocene. We adopted a genomic approach to infer the demographic history of a dominant tree (Litsea elongata) of EBLFs. We used Holocene temperature and anthropogenic disturbance factors to calculate the correlation between these variables and historical effective population size of L. elongata with Spearman statistics, and integrated the maximum‐entropy niche model to determine the impact of climate change and anthropogenic disturbance on fluctuation in its effective population size. We identified 9 well‐defined geographic clades for the populations of L. elongata. Based on the estimated historical population sizes of these clades, all the populations contracted, indicating persistent population decline over the last 11,000 years. Demographic history of L. elongata and human population change, change in cropland use, and change in irrigated rice area were significantly negatively correlated, whereas climate change in the Holocene was not correlated with demographic history. Our results support the early human impact hypothesis and provide comprehensive evidence of that early anthropogenic disturbance may contribute to the current biodiversity crisis in East Asia.题目:早期人类活动导致东亚亚热带常绿阔叶林优势种在过去11,000年间有效种群大小的持续衰退摘要当前生物多样性丧失的主因普遍被认为是人类活动的干扰, 但人类活动何时开始导致地球生物多样性的丧失这一重大的科学问题仍不清楚。一些学者的研究认为, 生物多样性的丧失始于工业革命; 另一些研究者则发现, 人类活动导致的生物多样性下降至少可以追溯到全新世早期。为了检验这两种假说, 我们聚焦于东亚亚热带地区, 该地区的土地开发、作物驯化已至少有近万年的历史。本研究立足东亚亚热带地区的特征植被类型, 即亚热带常绿阔叶林(EBLFs), 选取其优势树种樟科木姜子属黄丹木姜子(Litsea elongata)为研究对象, 基于基因组重测序方法研究黄丹木姜子种群在万年尺度下的动态历史。通过生态位模拟, 相关性分析等方法推测全新世气候变化, 人类活动因素(人口增长变化, 耕地面积变化, 灌溉稻作面积变化)与黄丹木姜子有效种群大小波动之间的相关性。研究结果发现, 依据地理分布范围, 黄丹木姜子的种群可划分为9大地理分支, 种群动态历史揭示其9大分支在11,000年以来有效种群大小持续下降的历史过程。相关性分析发现, 有效种群大小在11,000年以来的下降与东亚亚热带地区人口增长变化, 耕地面积变化, 灌溉稻作面积变化呈现显著的负相关, 而与全新世期间的气候变化则不呈现相关性。本研究结果支持早全新世人类活动干扰的假说, 并且为东亚地区早期人类活动与当今生物多样性危机的关联机制提供了全新的证据和认识。关键词:早期人类活动, 气候变化, 亚热带常绿阔叶林, 全新世, 种群动态历史, 基因组重测序This article is protected by copyright. All rights reserved

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Anthropogenic disturbance driving population decline of a dominant tree in East Asia evergreen broadleaved forests over the last 11,000 years

Qin,

Zuo,

et al. 2023

Conservation Biology

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“…A pill of tablet containing a known quantity (10,315 grains/tablet) of Lycopodium spores was added to each sample to determine absolute pollen concentrations (pollen grains per unit of sediment weight, Maher, 1981). The percentages of pollen were calculated based on the total terrestrial pollen, but the percentages of spores were based on the sum of pollen and spores (Hao et al, 2021;Yang et al, 2019). Identification of major types of palynomorphs (pollen, spores and freshwater algae) mainly followed descriptions of Wang et al (1995) and Tang et al (2018).…”

Section: Pollen Analysismentioning

confidence: 99%

Maize Cultivation Three Hundred Years Ago Triggered Severe Rocky Desertification in Southwest China

Yue,

Hao,

Wang

et al. 2024

Earth's Future

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Understanding the forest evolution is vital to answering the reforestation potential in karst areas. Here, we present the first‐ever pollen record in karst depression sediment, combined with comprehensive dating methods (137Cs, 210Pbex, and 14C) and historical documents, to reveal plant change history in southwest Guangxi, a severe rocky‐desertification region. We inferred three stages of “virgin forest–deforestation–sparse tree planting” over the past three centuries. Before the 1780s, the barren mountains used to be a lush mixed broadleaf forest probably. However, maize cultivation, along with explosive population growth and migration, accelerated mountain reclamation and deforestation, leading to severe rocky desertification since the 1780s, featured by the co‐occurrence of Zea pollen appearance and Dicranopteris spore surge from 0.92% to 12.18%. Since the 1930s, sparse tree planting began, as Cupressaceae/Taxodiaceae pollen abruptly increased by 32%. Our study is significant in understanding the rocky desertification causes and guiding ecological restoration in the region.

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“…Other indicators of the 8.2 climate anomaly include a greater abundance of deciduous broad-leaved trees based on pollen records from the Bohai Sea, suggesting a wetting trend between 8.2 and 7.0 cal ka BP (Zhao et al, 2021).…”

Section: Abrupt Climate Anomaly During the Early Holocenementioning

confidence: 99%

“…The early-to-mid Holocene (~12 to 6 ka) represents a period of rapid sealevel rise that had affected coastal environments worldwide (e.g., Hanebuth et al, 2000;. Environmental response to changing sea level is commonly archived in coastal sediment records (e.g., Woodroffe, 2000;Delgado et al, 2012;Lamb et al, 2006;Hao et al, 2021). Environmental reconstruction from early-to-mid Holocene sediment records therefore yields valuable information about the natural variability of sea-level changes and provides a basis to compare against anthropogenic-driven environmental stresses (e.g., Church and White, 2006;Jevrejeva et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Early-to-mid Holocene environmental change in the Kallang River Basin, Singapore

Yan¹

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2.1 Introduction 2.1.1 Holocene epoch 2.1.2 Sunda Shelf 2.2 Sea level records in the Sunda Shelf 2.3 Sedimentary and stratigraphic records in the Sunda Shelf 2.3.1 Mekong River delta 2.3.2 Red (Song Hong) River delta 2.3.3 Chao Phraya River delta 2.4 Rainfall variability in the Maritime Continent 2.4.1 Movement of the Inter-Tropical Convergence Zone 2.4.2 Zonal variations 2.4.3 Other drivers 2.4.4 Comparison of hydroclimate records 2.5 Abrupt climate anomaly during the early Holocene 2.6 Conclusion 2.7 References Chapter 3: Core-CT: a MATLAB application for the quantitative analysis of sediment and coral cores from X-ray Computed Tomography (CT) Abstract 3.1 Introduction 3.1.1 Geoscience applications of CT scanning 3.1.2 Challenges of using CT data 3.1.3 Core-CT 3.2 Quantitative data in CT scan images 3.3 Methods 3.3.1 Method 1: Constructing mean CT number profiles from ROI 3.3.2 Method 2: Localised CT number profile 3.3.3 Image and volume segmentation of ROI 3.4 Implementation 3.5 Applications of Core-CT in geoscience investigations 3.5.1 Identification of historical tsunami deposits in sedimentary record: Lake Huelde Chile 3.5.2 Identification of sedimentary units in unsplit sediment cores: Kallang River Basin, Singapore 3.5.3 Identification and quantification of coral growth bands and internal bioerosion: Red Sea, Saudi Arabia 3.6 Conclusion 3.7 Computer code availability 3.8 Declaration of competing interest 3.9 Acknowledgements 3.10 References Chapter 4: A sedimentary record of early-mid Holocene environmental change from southern Singapore Abstract 4.1 Introduction 4.2 Study site 4.3 Methods 4.3.1 Computed Tomography (CT) scan 4.3.2 Core logging 4.3.3 X-ray fluorescence (XRF) core scanning 4.3.4 Loss on Ignition (LOI) 4.3.5 Grain size distribution 4.3.6 Radiocarbon dating and chronology 4.4 Results 4.4.1 CT scanning 4.4.2 Core logging 4.4.3 XRF core scanning 4.4.4 Loss on Ignition (LOI) 4.4.5 Grain size distribution 4.4.6 Chronology of GRBH03 4.4.7 Lithofacies of GRBH03 4.5 Discussion 4.5.1 Sea level and sediment accumulation history 4.5.2 Other possible drivers of sediment accumulation 4.6 Conclusion 4.7 References Chapter 5: Early-mid Holocene environmental change inferred from shallow marine benthic foraminifera from Singapore Abstract 5.1 Introduction 5.2 Foraminifera as an environmental proxy 5.3 Study area 5.3.1 Foraminiferal studies in the Sunda Shelf 5.4 Methods 5.4.1 Chronology 5.4.2 Foraminiferal analysis 5.4.3 Quantitative analyses 5.5 Results 5.5.1 Foraminiferal assemblages 5.6 Discussion 5.6.1 Taphonomy effects 5.6.2 Environmental change inferred from foraminiferal records 5.7 Conclusion 5.8 Acknowledgements 5.9 References Chapter 6: Early-mid Holocene hydroclimate records using stable carbon and oxygen isotopes of shallow marine benthic foraminifera from Singapore

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Coastal morphodynamics and Holocene environmental changes in the Pearl River Delta, southern China: New evidence from palynological records

Cited by 8 publications

References 61 publications

Anthropogenic disturbance driving population decline of a dominant tree in East Asia evergreen broadleaved forests over the last 11,000 years

Anthropogenic disturbance driving population decline of a dominant tree in East Asia evergreen broadleaved forests over the last 11,000 years

Maize Cultivation Three Hundred Years Ago Triggered Severe Rocky Desertification in Southwest China

Early-to-mid Holocene environmental change in the Kallang River Basin, Singapore

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