scholarly journals Physicochemical Properties and Carbon Storage of Forest Soils on Cambodian Basalt: A Preliminary Study with a Density Fractionation Approach

2012 ◽  
Vol 47 (2) ◽  
pp. 217-226 ◽  
Author(s):  
Jumpei TORIYAMA ◽  
Seiichi OHTA ◽  
Yasuhiro OHNUKI ◽  
Akihiro IMAYA ◽  
Eriko ITO ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Carbon Storage ◽  
Forest Soils ◽  
Density Fractionation ◽  
Preliminary Study

scholarly journals Soil quality of the tea and apple-growing sites in Mindat District, Chin state, Myanmar: A preliminary study

2021 ◽  
Vol 70 (1) ◽  
pp. 27-40
Author(s):  
Yaung Kwee ◽  
Khin Soe
Keyword(s):  
Physicochemical Properties ◽  
Silty Clay ◽  
Subtropical Climate ◽  
Clay Loam ◽  
Silty Clay Loam ◽  
Preliminary Study ◽  
Phosphorus And Potassium ◽  
Very High ◽  
Physicochemical Properties Of Soils

In this study, two sites from tea and apple growing sites were collected from Pyay village and Nine Mile village, Mindat district, Chin state of West Myanmar under a humid subtropical climate. The results of physicochemical properties of observed soils were neutral pH, favorable moisture, silty clay loam texture, very high content of organic carbon, organic matter and total nitrogen. However, the tea growing soil was very poor in phosphorus and potassium content. Moreover, both soils lack of available potassium. The content of heavy metals in both soils was not varied from each other and followed the order: Fe (iron) > Cu (copper) >Zn (zinc) > Pb (lead) > Cr (chromium) and was below the maximum allowed concentrations (MAC). Therefore, the studied soils are generally favorable for cultivation under the condition of application of phosphorus and potassium fertilizers. However, due to the regular application of fertilizers and pesticides, it is necessary to monitor these soils for PTE levels. Further research is recommended, which must include analyses of the physicochemical properties of soils to a two depths of 0-30 and 30-60 cm, especially for the area where fruit plants are grown. In addition, higher density of soil samples and sub-samples are necessary to produce a reliable dataset that will allow proper statistical analysis.

scholarly journals Association with pedogenic iron and aluminum: effects on soil organic carbon storage and stability in four temperate forest soils

2017 ◽  
Vol 133 (3) ◽  
pp. 333-345 ◽  
Author(s):  
Rachel C. Porras ◽  
Caitlin E. Hicks Pries ◽  
Karis J. McFarlane ◽  
Paul J. Hanson ◽  
Margaret S. Torn
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Carbon Storage ◽  
Forest Soils ◽  
Temperate Forest ◽  
Soil Organic Carbon Storage ◽  
Temperate Forest Soils ◽  
Organic Carbon Storage

scholarly journals Carbon Storage in Coarse and Fine Fractions of Pacific Northwest Old-Growth Forest Soils

2004 ◽  
Vol 68 (6) ◽  
pp. 2023-2030 ◽  
Author(s):  
P. S. Homann ◽  
S. M. Remillard ◽  
M. E. Harmon ◽  
B. T. Bormann
Keyword(s):  
Pacific Northwest ◽  
Carbon Storage ◽  
Forest Soils ◽  
Old Growth ◽  
Old Growth Forest

Mineral Weathering Promotes Carbon Storage in Forest Soils Macro to Nanoscale Characterizations of 20-year in situ Weathered Vermiculite Particles

2021 ◽  
Author(s):  
Ingride Jesus Van Der Kellen ◽  
Delphine Derrien ◽  
Jaafar Ghanbaja ◽  
Marie-Pierre Turpault
Keyword(s):  
Electron Microscopy ◽  
Organic Matter ◽  
Cation Exchange ◽  
Carbon Storage ◽  
Forest Soils ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Mineral Weathering ◽  
Element Mapping

<p>Forest soils are a major contributor to soil organic carbon (C) storage in terrestrial ecosystems and play a key-role in climate change mitigation. Mineral weathering in soils is expected to promote chemical and physical interactions between soil organic matter and mineral phases. These interactions are known to enhance the protection of organic matter from decomposition. The investigation of the mineral-organic associations (MOA) formation mechanisms during weathering is therefore crucial to understand carbon storage processes in soils. Until now studies have been mainly conducted through laboratory experiments in simplified and controlled conditions or over very long-term time scales using pedosequences. But knowledge about MOA formation processes occurring in situ is lacking, notably during the first stage of mineral weathering.</p><p>To fill this gap, we performed a mesh bag incubation of large Na-saturated vermiculite particles (100-200 µm in size) in a Typic Dystrochrept soil of a Douglas-fir forest, in the Beaujolais area (France). The incubated particles were deposited at the interface under the forest floor. After 20 years, the weathered vermiculite particles were collected and characterized at the macro-scale (XRD and physico-chemical analysis), at the micro-scale (Scanning Electron Microscopy – SEM, imaging and element mapping) and at the nano-scale (Transmission Electron Microscopy - TEM imaging, element mapping and speciation).</p><p>Cation exchange capacity, exchangeable cations and elemental analysis showed significant differences between the mineral structures of the initial (V0) and 20 year incubated (V20) vermiculite particles. The exchangeable Na was completely depleted. Cation exchange capacity strongly decreased in V20 (49.2 cmol<sub>c</sub> kg<sup>-1</sup>) compared to V0 (173.6 cmol<sub>c</sub> kg<sup>-1</sup>). The V20 lost its specific interlayer collapsing property (≈1.4 -> ≈1.0 nm) with K saturation. V20 interlayer collapsing was only observed with a 330°C heating treatment, suggesting the interlayer hydroxylation of vermiculite. High sheet dissolution, around 10%, was also observed. All these changes were attributed to chemical weathering, during which total C analysis showed significant enrichment in V20 (5.7 mg g<sup>-1</sup>) compared to V0 (0.8 mg g<sup>-1</sup>).</p><p>Macro, micro and nano-scale images and elemental mapping of V0 particles showed a highly flat, smooth surface morphology with no detected C. In contrast, V20 particles showed irregular outer and inner surfaces marked by multiple cracks of chemical dissolution. We also observed internal nano-sized exfoliation spaces filled with C and enriched in Ca, and micro-sized exfoliation spaces filled with C entrapped in nano-crystalline Mn oxides or K-rich aluminosilicates precipitates. The nature of the organic matter found strongly differed between small and large exfoliation spaces. It was characterized by alcohol, carboxyl functional groups and C=C bonds in small exfoliation spaces, while the obtained EELS spectra were more difficult to interpret in large exfoliations spaces. These results provide new evidence that over 20 years in situ weathering induces a significant dissolution, among other physical and chemical changes in large vermiculite particles. They reveal that the mineral weathering processes are responsible for the organic matter entrapment (i) in the newly formed mineral nano-sized spaces, possibly mediated by Ca, and (ii) in association with secondary minerals deposits in micro-sized spaces.</p>

A preliminary study on the physicochemical properties of pigmented Sty/nBA/MMA emulsion films: The effect of thermal ageing

2018 ◽  
Vol 158 ◽  
pp. 157-167
Author(s):  
T. Fardi ◽  
E. Kampasakali ◽  
Z. Terzopoulou ◽  
V. Pintus ◽  
E. Pavlidou ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Thermal Ageing ◽  
Preliminary Study ◽  
Emulsion Films
Sign in / Sign up

Export Citation Format

Share Document