Gas Diffusivity in Undisturbed Volcanic Ash Soils

2003 ◽  
Vol 67 (1) ◽  
pp. 41-51 ◽  
Author(s):  
Per Moldrup ◽  
Seiko Yoshikawa ◽  
Torben Olesen ◽  
Toshiko Komatsu ◽  
Dennis E. Rolston
Keyword(s):  
Volcanic Ash ◽  
Gas Diffusivity ◽  
Volcanic Ash Soils

Gas Diffusivity in Undisturbed Volcanic Ash Soils

2003 ◽  
Vol 67 (1) ◽  
pp. 41 ◽  
Author(s):  
Per Moldrup ◽  
Seiko Yoshikawa ◽  
Torben Olesen ◽  
Toshiko Komatsu ◽  
Dennis E. Rolston
Keyword(s):  
Volcanic Ash ◽  
Gas Diffusivity ◽  
Volcanic Ash Soils

scholarly journals Linear Model to Predict Soil-Gas Diffusivity from Two Soil-Water Retention Points in Unsaturated Volcanic Ash Soils

2008 ◽  
Vol 48 (3) ◽  
pp. 397-406 ◽  
Author(s):  
Augustus C. Resurreccion ◽  
Toshiko Komatsu ◽  
Ken Kawamoto ◽  
Masanobu Oda ◽  
Seiko Yoshikawa ◽  
...  
Keyword(s):  
Soil Water ◽  
Linear Model ◽  
Water Retention ◽  
Volcanic Ash ◽  
Soil Gas ◽  
Soil Water Retention ◽  
Gas Diffusivity ◽  
Volcanic Ash Soils

Evaluation of gas diffusivity models for no-tilled and tilled volcanic ash soils

2016 ◽  
Vol 62 (9) ◽  
pp. 1324-1335
Author(s):  
Linlin Guo ◽  
Taku Nishimura ◽  
Hiromi Imoto ◽  
Zhigang Sun
Keyword(s):  
Volcanic Ash ◽  
Gas Diffusivity ◽  
Volcanic Ash Soils

Specific Retention of Radiocesium in Volcanic Ash Soils Devoid of Micaceous Clay Minerals

2004 ◽  
Vol 68 (1) ◽  
pp. 313 ◽  
Author(s):  
Emmanuel Joussein ◽  
Nathalie Kruyts ◽  
Dominique Righi ◽  
Sabine Petit ◽  
Bruno Delvaux
Keyword(s):  
Clay Minerals ◽  
Volcanic Ash ◽  
Specific Retention ◽  
Volcanic Ash Soils

scholarly journals Sorption and leaching characteristics of pesticides in volcanic ash soils of Jeju Island, Korea

2020 ◽  
Vol 63 (1) ◽  
Author(s):  
Won-Pyo Park ◽  
Kong-Man Chang ◽  
Hae-Nam Hyun ◽  
Kyung-Hwan Boo ◽  
Bon-Jun Koo
Keyword(s):  
Volcanic Ash ◽  
Agricultural Soils ◽  
Distribution Coefficients ◽  
The Other ◽  
Jeju Island ◽  
European Standard ◽  
Leaching Behavior ◽  
Mobility Assessment ◽  
Leaching Characteristics ◽  
Volcanic Ash Soils

Abstract It is important to evaluate leaching behavior in agricultural soils to prevent the pollution of groundwater by pesticides. We identified the distribution coefficients (Kd) of ten pesticides with different physicochemical properties and compared their leaching characteristics using wick lysimeters from three distinct soil types on Jeju Island. The Kd values varied by pesticide and soil, but were within the range of 1.2 to 4231 L kg−1. Based on the European standard (Kd < 10 L kg−1), six pesticides (alachlor, ethoprophos, carbofuran, napropamide, tebuconazole, and etridiazole) were mobile in at least one tested soil, and their soil organic carbon affinity was ≤ 5.811. This value differed greatly from the other pesticides (16.533 and higher). The solubility of the six mobile pesticides was ≥ 32 mg L−1, which substantially differed from the other pesticides (≤ 0.71 mg L−1). Thus, we conclude that our mobility assessment, which is based on Kd values, can be used to predict the leaching of pesticides in the volcanic ash soils of Jeju Island. The use of pesticides should be strictly controlled to reduce the possibility of groundwater contamination.

Aluminum concentrations in sclerotia from a buried humic horizon of volcanic ash soils in Mt. Myoko, Central Japan

2001 ◽  
Vol 47 (2) ◽  
pp. 411-418 ◽  
Author(s):  
Makiko Watanabe ◽  
Nobuhide Fujitake ◽  
Hiroyuki Ohta ◽  
Takushi Yokoyama
Keyword(s):  
Volcanic Ash ◽  
Central Japan ◽  
Humic Horizon ◽  
Volcanic Ash Soils

Models relating soil pH measurements in H2O, KCl and CaCl2 for volcanic ash soils of Cameroon

2018 ◽  
Vol 14 ◽  
pp. e00185 ◽  
Author(s):  
Georges Kogge Kome ◽  
Roger Kogge Enang ◽  
Bernard Palmer Kfuban Yerima ◽  
Meli Gilles Raoul Lontsi
Keyword(s):  
Soil Ph ◽  
Volcanic Ash ◽  
Ph Measurements ◽  
Volcanic Ash Soils

Erodibility and runoff-infiltration characteristics of volcanic ash soils along an altitudinal climosequence in the Ecuadorian Andes

CATENA ◽  
2006 ◽  
Vol 65 (3) ◽  
pp. 201-213 ◽  
Author(s):  
Franz Zehetner ◽  
William P. Miller
Keyword(s):  
Volcanic Ash ◽  
Volcanic Ash Soils

Soil organic carbon stocks under different páramo vegetation covers in Ecuador’s northern Andes

2021 ◽  
Author(s):  
Marlon Calispa ◽  
Raphaël van Ypersele ◽  
Benoît Pereira ◽  
Sebastián Páez-Bimos ◽  
Veerle Vanacker ◽  
...  
Keyword(s):  
Volcanic Ash ◽  
Vegetation Type ◽  
Regional Scale ◽  
Soil Samples ◽  
Related Factors ◽  
Organic C ◽  
Soil C ◽  
C Storage ◽  
Soc Stocks ◽  
Volcanic Ash Soils

&lt;p&gt;The Ecuadorian p&amp;#225;ramo, a neotropical ecosystem located in the upper Andes, acts as a constant source of high-quality water. It also stores significant amounts of C at the regional scale. In this region, volcanic ash soils sustain most of the paramo, and C storage results partly from their propensity to accumulate organic matter. Vegetation type is known to influence the balance between plant C inputs and soil C losses, ultimately affecting the soil organic C (SOC) content and stock. Tussock-forming grass (spp. Calamagrostis Intermedia; TU), cushion-like plants (spp. Azorella pedunculata; CU) and shrubs and trees (Polylepis stands) are commonly found in the p&amp;#225;ramo. Our understanding of SOC stocks and dynamics in the p&amp;#225;ramo remains limited, despite mounting concerns that human activities are increasingly affecting vegetation and potentially, the capacity of these ecosystems to store C.&lt;/p&gt;&lt;p&gt;Here, we compare the organic C content and stock in soils under tussock-forming grass (spp. Calamagrostis Intermedia; TU) and soils under cushion-like plants (spp. Azorella pedunculata; CU). The study took place at Jatunhuayco, a watershed on the western slopes of Antisana volcano in the northern Ecuadorian Andes. Two areas of similar size (~0.35 km&lt;sup&gt;2&lt;/sup&gt;) were surveyed. Fourty soil samples were collected randomly in each area to depths varying from 10 to 30 cm (A horizon) and from 30 to 75 cm (2Ab horizon). The soils are Vitric Andosols and the 2Ab horizon corresponds to a soil buried by the tephra fall from the Quilotoa eruption about 800 yr. BP. Sixteen intact soil samples were collected in Kopecky's cylinders for bulk density (BD) determination of each horizon.&lt;/p&gt;&lt;p&gt;The average SOC content in the A horizon of the CU sites (9.4&amp;#177;0.5%) is significantly higher (Mann-Whitney U test, p&lt;0.05) than that of the TU sites (8.0&amp;#177;0.4%), probably reflecting a larger input of root biomass from the cushion-forming plants. The 2Ab horizon contains less organic C (i.e. TU: 4.3&amp;#177;0.3% and CU: 4.0&amp;#177;0.4%) than the A horizon, but the SOC contents are undistinguishable between the two vegetation types. This suggests that the influence of vegetation type on SOC is limited to the A horizon. The average SOC stocks (in the first 30 cm from the soil) for TU and CU are 20.04&amp;#177;1.1 and 18.23&amp;#177;1.0 kg/m&lt;sup&gt;2&lt;/sup&gt;,&lt;sup&gt;&lt;/sup&gt;respectively. These values are almost two times greater than the global average reported for Vitric Andosols (~8.2 kg/m&lt;sup&gt;2&lt;/sup&gt;&amp;#160;), but are lower than the estimates obtained for some wetter Andean p&amp;#225;ramos (22.5&amp;#177;5 kg/m&lt;sup&gt;2&lt;/sup&gt;, 270% higher rainfall) from Ecuador. Our stock values further indicate that vegetation type has a limited effect on C storage in the young volcanic ash soils found at Jatunhuyaco. Despite a higher SOC content, the CU soils store a stock of organic C similar to that estimated for the TU soils. This likely reflects the comparatively lower BD of the former soils (650&amp;#177;100 vs. 840&amp;#177;30 kg/m&lt;sup&gt;3&lt;/sup&gt;). Additional studies are needed in order to establish the vegetation-related factors driving the SOC content and stability in the TU and CU soils.&lt;/p&gt;

Occurrence of Imogolite in some Volcanic Ash Soils of New Zealand

Clay Minerals ◽  
1973 ◽  
Vol 10 (2) ◽  
pp. 127-130 ◽  
Author(s):  
N. Yoshinaga ◽  
J. M. Tait ◽  
R. Soong
Keyword(s):  
New Zealand ◽  
Volcanic Ash ◽  
Volcanic Ash Soils
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