Clay fractions from a soil chronosequence after glacier retreat reveal the initial evolution of organo–mineral associations

2012 ◽  
Vol 85 ◽  
pp. 1-18 ◽  
Author(s):  
Alexander Dümig ◽  
Werner Häusler ◽  
Markus Steffens ◽  
Ingrid Kögel-Knabner
Keyword(s):  
Glacier Retreat ◽  
Soil Chronosequence ◽  
Mineral Associations ◽  
Initial Evolution

scholarly journals CO2 and N2O emissions in a soil chronosequence at a glacier retreat zone in Maritime Antarctica

2015 ◽  
Vol 521-522 ◽  
pp. 336-345 ◽  
Author(s):  
A. Thomazini ◽  
E.S. Mendonça ◽  
D.B. Teixeira ◽  
I.C.C. Almeida ◽  
N. La Scala ◽  
...  
Keyword(s):  
Glacier Retreat ◽  
N2o Emissions ◽  
Maritime Antarctica ◽  
Soil Chronosequence

Changes of soil phosphorus speciation along a 120-year soil chronosequence in the Hailuogou Glacier retreat area (Gongga Mountain, SW China)

Geoderma ◽  
2013 ◽  
Vol 195-196 ◽  
pp. 251-259 ◽  
Author(s):  
Jun Zhou ◽  
Yanhong Wu ◽  
Jörg Prietzel ◽  
Haijian Bing ◽  
Dong Yu ◽  
...  
Keyword(s):  
Soil Phosphorus ◽  
Glacier Retreat ◽  
Phosphorus Speciation ◽  
Sw China ◽  
Soil Chronosequence ◽  
Gongga Mountain

scholarly journals Rapid loss of phosphorus during early pedogenesis along a glacier retreat choronosequence, Gongga Mountain (SW China)

PeerJ ◽  
2015 ◽  
Vol 3 ◽  
pp. e1377 ◽  
Author(s):  
Yanhong Wu ◽  
Jun Zhou ◽  
Haijian Bing ◽  
Hongyang Sun ◽  
Jipeng Wang
Keyword(s):  
Plant Biomass ◽  
Glacier Retreat ◽  
Inorganic P ◽  
Sw China ◽  
Soil Chronosequence ◽  
Gongga Mountain ◽  
P Loss ◽  
Hedley Fractionation ◽  
Ecosystem Level ◽  
Stock Depletion

The loss of phosphorus (P) during the early pedogenesis stage is important at the ecosystem level, and it also plays an important role in the global P cycle. The seasonal variation of total P (Pt) and its fractions along a young soil chronosequence (Hailuogou chronosequence) on the eastern slope of Gongga Mountain, SW China, was investigated based on the modified Hedley fractionation technique to understand P loss during the early pedogenesis stage. The results showed that the mineral P (mainly apatite) was the dominant fraction of Pt in the C horizon of the soil, and the seasonal difference in Pt and its fractions was insignificant. In the A horizon, Pt concentrations decreased markedly compared with those in the C horizon, and as the age of the soil increased, the inorganic P (Pi) significantly decreased and the organic P (Po) prominently increased. Seasonally, the P fractions exhibited various distributions in the A horizon. The variation of Pt and its fractions revealed that the P loss was rapid along the 120-year soil chronosequence. The P stocks in soils (0–30 cm) started to decrease at the 52 year site. And the P stock depletion reached almost 17.6% at the 120-year site. The loss of P from the soil of the Hailuogou chronosequence was mainly attributed to weathering, plant uptake, and transport by runoff. About 36% P loss was transported into plant biomass P at the 120 year site. The data obtained indicated that the glacier retreat chronosequence could be used to elucidate the fast rate of P loss during the early pedogenic stage.

scholarly journals Rapid loss of phosphorus during early pedogenesis along a glacier retreat choronosequence, Gongga Mountain (SW China)

2015 ◽  
Author(s):  
Yanhong Wu ◽  
Jun Zhou ◽  
Haijian Bing ◽  
Hongyang Sun ◽  
Jipeng Wang
Keyword(s):  
Glacier Retreat ◽  
Inorganic P ◽  
Sw China ◽  
Soil Chronosequence ◽  
Gongga Mountain ◽  
P Loss ◽  
Hedley Fractionation ◽  
Ecosystem Level ◽  
Total P ◽  
P Cycle

The loss of phosphorus (P) during the early pedogenesis stage is important at the ecosystem level, and it also plays an important role in the global P cycle. The seasonal variation of total P (Pt) and its fractions along a young soil chronosequence (Hailuogou chronosequence) on the eastern slope of Gongga Mountain, SW China, was investigated based on the modified Hedley fractionation technique to understand P loss during the early pedogenesis stage. The results showed that the mineral P (mainly apatite) was the dominant fraction of Pt in the C horizon of the soil, and the seasonal difference in Pt and its fractions was insignificant. In the A horizon, Pt concentrations decreased markedly compared with those in the C horizon, and as the age of the soil increased, the inorganic P (Pi) significantly decreased and the organic P (Po) prominently increased. Seasonally, the P fractions exhibited various distributions in the A horizon. The variation of Pt and its fractions revealed that the P loss was rapid along the 120-year soil chronosequence. The concentrations of Pt in the original minerals decreased more than 50% in the 52 years since the glacier retreated, and the depletion reached almost 80% at the 120-year pedogenesis. The loss of P from the soil of the Hailuogou chronosequence was mainly attributed to weathering, plant uptake, and transport by runoff. The data obtained indicated that the glacier retreat chronosequence could be used to elucidate the fast rate of P loss during the early pedogenesis stage.

scholarly journals Rapid loss of phosphorus during early pedogenesis along a glacier retreat choronosequence, Gongga Mountain (SW China)

2015 ◽  
Author(s):  
Yanhong Wu ◽  
Jun Zhou ◽  
Haijian Bing ◽  
Hongyang Sun ◽  
Jipeng Wang
Keyword(s):  
Glacier Retreat ◽  
Inorganic P ◽  
Sw China ◽  
Soil Chronosequence ◽  
Gongga Mountain ◽  
P Loss ◽  
Hedley Fractionation ◽  
Ecosystem Level ◽  
Total P ◽  
P Cycle

The loss of phosphorus (P) during the early pedogenesis stage is important at the ecosystem level, and it also plays an important role in the global P cycle. The seasonal variation of total P (Pt) and its fractions along a young soil chronosequence (Hailuogou chronosequence) on the eastern slope of Gongga Mountain, SW China, was investigated based on the modified Hedley fractionation technique to understand P loss during the early pedogenesis stage. The results showed that the mineral P (mainly apatite) was the dominant fraction of Pt in the C horizon of the soil, and the seasonal difference in Pt and its fractions was insignificant. In the A horizon, Pt concentrations decreased markedly compared with those in the C horizon, and as the age of the soil increased, the inorganic P (Pi) significantly decreased and the organic P (Po) prominently increased. Seasonally, the P fractions exhibited various distributions in the A horizon. The variation of Pt and its fractions revealed that the P loss was rapid along the 120-year soil chronosequence. The concentrations of Pt in the original minerals decreased more than 50% in the 52 years since the glacier retreated, and the depletion reached almost 80% at the 120-year pedogenesis. The loss of P from the soil of the Hailuogou chronosequence was mainly attributed to weathering, plant uptake, and transport by runoff. The data obtained indicated that the glacier retreat chronosequence could be used to elucidate the fast rate of P loss during the early pedogenesis stage.

Glacier variations 1930–1970, 1970–1995, 1995–2017 and 2017–2018

JOKULL ◽  
2020 ◽  
Vol 69 ◽  
pp. 129-136
Author(s):  
Hrafnhildur Hannesdóttir
Keyword(s):  
Glacier Retreat ◽  
Proglacial Lakes ◽  
Glacier Front ◽  
Bad Weather

Glacier variations 1930–1970, 1970–1995, 1995–2017 and 2017–2018 The Icelandic Glaciological Society received reports on 46 measurements sites of glacier front variations in the autumn of 2018. Glacier retreat was observed at 33 survey sites whereas advances where reported from 5 sites, and 4 showed no signs of change. Snow covered glacier margins, bad weather or floating icebergs in the proglacial lakes prevented measurement at a few sites. One new site was added to the network, the western part of Þórisjökull.

Aposematism

2018 ◽  
Author(s):  
Graeme D. Ruxton ◽  
William L. Allen ◽  
Thomas N. Sherratt ◽  
Michael P. Speed
Keyword(s):  
Secondary Effects ◽  
Warning Coloration ◽  
Common Features ◽  
Initial Evolution ◽  
The Common ◽  
Aposematic Signals

Aposematism is the pairing of two kinds of defensive phenotype: an often repellent secondary defence that typically renders prey unprofitable to predators if they attack them and some evolved signal that indicates the presence of that defence. Aposematic signals often work to modify the behaviours of predators both before and during attacks. Warning coloration, for example, may increase wariness and hence improve the chances that a chemically defended prey is released unharmed after an attack. An aposematic signal may therefore first tend to reduce the probability that a predator commences attack (a primary defence) and then (as a component of secondary defence) reduce the probability that the prey is injured or killed during any subsequent attack. In this chapter we will consider both the primary and the secondary effects of aposematic signals on prey protection. We begin first by describing the common features of aposematic signals and attempting to show the wide use to which aposematic signalling is deployed across animals (and perhaps plants too). We then review the interesting evolutionary issues aposematic signals raise, including their initial evolution and their integration with sexual and other signals. We also discuss important ecological, co-evolutionary, and macroevolutionary consequences of aposematism.

scholarly journals A Lacustrine Glacier Retreat Sequence from the Permo-Carboniferous Dwyka Formation, Republic of South Africa

1983 ◽  
Vol 29 (103) ◽  
pp. 515-520
Author(s):  
J. N. J. Visser
Keyword(s):  
South Africa ◽  
Lacustrine Sediments ◽  
Glacier Retreat ◽  
Marine Transgression ◽  
Northern Margin ◽  
Valley Fill ◽  
Karoo Basin ◽  
Ice Retreat ◽  
Glacier Advance

Abstract The upper part of a Permo-Carboniferous glacial valley fill along the northern margin of the Karoo Basin includes glacio-lacustrine sediments. During the last glacier advance into the lake, a bedded heterogeneous diamictite facies was deposited and, on glacier retreat, a sequence of deformed siltstones with diamictite lenses and sandstone beds, varved shale and rhythmite shale was laid down. Black carbonaceous mud was deposited during the subsequent marine transgression. According to varve counts, the glacier receded from the valley over a period of 500 to 1 000 years and it is concluded that the overall ice-retreat rate during the Permo-Carboniferous deglaciation was relatively high.

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