Late Quaternary environmental history of the south-eastern Tibetan Plateau inferred from the Lake Naleng non-pollen palynomorph record

<p>‘Ka mua, ka muri’, Walking backwards into the future, is a Māori proverb that aptly describes the findings of this thesis. That we should look to the past to inform the future is arguably the purpose of history, yet we have to walk back far enough. Tracing back from the present, this thesis will address what has driven political, economic, environmental and social change within the South Wairarapa region from 1984 to the present day. The region has experienced significant changes to its physical and social environment over the past thirty years. Many modern historians have attributed the key changes of this period, such as agricultural intensification, diversification, rising unemployment and environmental degradation, to the economic re-structuring of the Fourth Labour Government. This thesis will argue that these changes, and neoliberal reform itself, are consequent of much longer historiographical trends. Examination of the historical context and legacies of the intensification of dairy farming, rise of the viticulture industry, and the relationship between Ngāti Kahungunu and Rangitāne o Wairarapa and their whenua, reveals complexities in the history of the region that histories of neoliberal change commonly conceal. The identification of these long running historiographical trends aides understanding of the historical context in which neoliberal reform occurred, and provides alternative narratives for the changes that have occurred over the past thirty years. Furthermore, it suggests alternative trajectories for how viticulture, agriculture and Te Ao Māori may walk into the future.</p>

Download Full-text

Fire, vegetation and Holocene climate in the south-eastern Tibetan Plateau: a multi-biomarker reconstruction from Paru Co

10.5194/cp-2018-19 ◽

2018 ◽

Author(s):

Alice Callegaro ◽

Felipe Matsubara Pereira ◽

Dario Battistel ◽

Natalie M. Kehrwald ◽

Broxton W. Bird ◽

...

Keyword(s):

Tibetan Plateau ◽

Biomass Burning ◽

Fire History ◽

Vegetation Changes ◽

The Tibetan Plateau ◽

Eastern Tibetan Plateau ◽

The South ◽

South Eastern ◽

The Past ◽

High Concentrations

Abstract. The fire history of the Tibetan Plateau over centennial to millennial timescales is still unknown. Recent ice core studies reconstruct fire history over the past few decades but do not extend through the Holocene. Lacustrine sedimentary cores, however, provide continuous records of large-scale and local environmental modifications due to their accumulation of specific organic molecular markers throughout the past millennia. In order to reconstruct Holocene fire events and vegetation changes occurring on the south-eastern Tibetan Plateau and the surrounding areas, we improved and integrated previous analytical methods. The multi-proxy procedure was applied to samples retrieved from Paru Co, a small lake located in the Nyainqentanglha Mountains (29°47'45.6" N; 92°21'07.2" E; 4845 m a.s.l.). The investigated biomarkers include n-alkanes as indicators of vegetation, polycyclic aromatic hydrocarbons (PAHs) as combustion proxies, faecal sterols and stanols (FeSts) as indicators of the presence of humans or grazing animals and finally monosaccharide anhydrides (MAs) as specific markers of vegetation burning processes. Relatively high concentrations of both MAs and PAHs demonstrate intense local biomass burning activity during the early Holocene (10.9–10.7 cal ky BP), which correspond to a drier climate following deglaciation. High concentrations of MAs but not PAHs between 10.7–9 cal ky BP suggest a period of regional biomass burning followed by a decreasing fire trend through the mid-late Holocene. This fire history is consistent with local vegetation changes reconstructed from both n-alkanes and regional pollen records, where vegetation types depend on the centennial-scale intensity of monsoon precipitation. FeSts were below detection limits for most of the samples, suggesting limited direct human influences on fire regime and vegetation changes in the lake's catchment. Climate is the main influence on fire activity recorded in Paru Co over millennial timescales, where biomass burning fluctuates in response to alternating warm/humid and cool/dry periods.

Download Full-text

Ka Mua, Ka Muri-Walking Backwards into the Future: An Environmental History of the South Wairarapa Region 1984-2016

10.26686/wgtn.17067659.v1 ◽

2021 ◽

Author(s):

◽

Eleanor Jane Rainford

Keyword(s):

Environmental History ◽

Historical Context ◽

The South ◽

Neoliberal Reform ◽

The Past ◽

The Future ◽

History Of ◽

Political Economic ◽

The Relationship ◽

History Of The South

<p>‘Ka mua, ka muri’, Walking backwards into the future, is a Māori proverb that aptly describes the findings of this thesis. That we should look to the past to inform the future is arguably the purpose of history, yet we have to walk back far enough. Tracing back from the present, this thesis will address what has driven political, economic, environmental and social change within the South Wairarapa region from 1984 to the present day. The region has experienced significant changes to its physical and social environment over the past thirty years. Many modern historians have attributed the key changes of this period, such as agricultural intensification, diversification, rising unemployment and environmental degradation, to the economic re-structuring of the Fourth Labour Government. This thesis will argue that these changes, and neoliberal reform itself, are consequent of much longer historiographical trends. Examination of the historical context and legacies of the intensification of dairy farming, rise of the viticulture industry, and the relationship between Ngāti Kahungunu and Rangitāne o Wairarapa and their whenua, reveals complexities in the history of the region that histories of neoliberal change commonly conceal. The identification of these long running historiographical trends aides understanding of the historical context in which neoliberal reform occurred, and provides alternative narratives for the changes that have occurred over the past thirty years. Furthermore, it suggests alternative trajectories for how viticulture, agriculture and Te Ao Māori may walk into the future.</p>

Download Full-text

Late Quaternary Glacial History of the South Orkney Plateau, Antarctica

Quaternary Research ◽

10.1016/0033-5894(90)90055-p ◽

1990 ◽

Vol 33 (3) ◽

pp. 265-275 ◽

Cited By ~ 22

Author(s):

Margaret J. Herron ◽

John B. Anderson

Keyword(s):

Late Quaternary ◽

The South ◽

Ice Shelf ◽

Radiocarbon Dates ◽

Orkney Islands ◽

Ice Cap ◽

History Of ◽

Seismic Records ◽

Ice Conditions ◽

History Of The South

AbstractPiston cores from the South Orkney Plateau penetrated overcompacted diamictons in water depths of up to 250 m. Detailed textural and petrological analyses of these diamictons indicate that they are basal tills. Seismic records from the plateau show a widespread surface of glacial erosion and provide additional evidence of an ice cap grounded to a depth of 250 m. Piston cores from the slope of the plateau penetrated diatomaceous muds resting directly on poorly sorted muds with very little to no biogenic material. The ice-rafted debris in these glacial-marine sediments is composed almost exclusively of material derived from the South Orkney Islands. This implies deposition beneath an ice shelf as opposed to iceberg rafting. In contrast, diatomaceous muds contain relatively abundant exotic iceberg-rafted material and reflect a glacial-maritime setting similar to that of today. The sharp contact separating diatomaceous surface sediments from basal tills and sub-ice shelf deposits indicates that the ice cap and ice shelf retreated from the plateau rapidly. Radiocarbon dates for diatomaceous muds from a glacial trough on the plateau indicate that the ice cap and ice shelf retreated from the plateau prior to 6000 to 7000 years ago. The homogeneity of surficial diatomaceous sediments suggests that sea ice conditions over the plateau have not changed radically since that time.

Download Full-text