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Chemometric methods can contribute to soil research by permitting the extraction of more information from the data. The aim of this work was to use Principal Component Analysis to evaluate data obtained through chemical and spectroscopic methods on the changes in the humification process of soil organic matter from two tropical soils after sewage sludge application. In this case, humic acids extracted...
Soil samples, collected to a depth of 15cm from 24 plots at six UK deciduous woodland sites in 1971 and 2002, were analysed for 14 C, and total soil carbon pools (gCm −2 ) were estimated. The results, together with data from a further woodland site, were interpreted using steady-state models, driven by the 14 C content of atmospheric CO 2 . The average soil pool is...
Changes in soil surface charge and phosphorus (P) sorption capacity of soils may affect the availability of P in soils. We investigated how changes in soil properties in the Bear Brook Watershed in Maine (BBWM), which is a long-term paired-watershed experimental acidification study, may affect P availability using the Cushman–Barber plant nutrient uptake simulation model. Both NH 4 Cl- and...
Rate of phosphorus (P) transformation in soils can significantly influence P fertility of soils. The transformation rate and fractionations of P in 20 calcareous soils of varying properties were investigated. Phosphorus was added to the samples at rates of 200mgkg −1 soil. The samples were incubated for 3, 24, 168, 336, 504, 720, 1440, and 2160h at 25°C and Olsen-P was determined after each...
Fluidized bed combustion ash (FBC) is a by-product from coal-fired power stations used for many decades in concrete, cement and brick manufacturing and more recently for trace metal immobilization and pesticide retention in soils. Moreover FBC ash has been recommended by some authors as a soil amendment in agriculture for its nutrient supply. In this study silico-aluminous (SiAl) and sulfo-calcic...
Understanding the root mechanisms of hyperaccumulating or phytostabilizing plants in response to heavy metal exposure is important for the successful implementation of phytoremediation technologies. Root induced dissolved organic carbon (DOC) and organic acids (OAs) were investigated under greenhouse conditions in the rhizosphere after growing two plant species, Indian mustard (Brassica juncea) and...
Because humic substances have varying turnover rates, their stable carbon-isotope compositions have been used to assess carbon residence time in soils. However, any study of this nature must ensure that extraction techniques do not fractionate the δ 13 C values of the humic acid extract and residual humin. This study examines the effects of different extraction procedures on the carbon-isotope...
Exposure to toxic metals from fruits is an important pathway of human exposure to soil pollutants, but few researches on metals accumulation in the soil–fruit system were performed. In this study, we conducted a systemic survey of Cd and Pb accumulations in the soil–mango (Mangifera indica L.) system from an uncontaminated area, Hainan Island, China. Results indicated that concentrations of Cd and...
The role of geomorphology in relation to the spatial and temporal distribution of soil carbon is of considerable interest in terms of landscape management and carbon sequestration. Soil carbon plays an important role in soil water holding capacity, soil structure and overall soil health. Soil is also a significant store of terrestrial carbon. This study examines total soil carbon (SC) concentration...
Water extractable organic matter (WEOM) is attributed a key role in soil major biogeochemical processes. Yet, information concerning its dynamics within the soil profile and under uncontrolled field conditions is scarce, particularly in agricultural soils. Here, we present a study of WEOM dynamics across a soil profile of 100cm over a period of seven months. Soil samples were collected from a field...
One of the most fragile areas in the China Loess Plateau, is the transitional belt that is subjected to wind and water erosion. The transitional belt accounts for about 30% of the Loess Plateau area. To reduce soil degradation in the Loess Plateau, the Chinese government initiated a state-funded vegetation restoration project in 1999. The effectiveness of this project on transitional belt soils is...
Relief may be considered an integrating factor that expresses the interaction of various soil and plant attributes. This work aimed to analyze the potential use of landforms to predict the variability of soil and orange attributes. The study area is located in the state of São Paulo, Brazil. The following soil attributes were analyzed: clay content, organic matter content, water content, aggregate...
Estrogenic compounds in livestock manure are also present in soils because manure is land applied on account of its value as an important nutrient source in agricultural production. This is the first study to compare the sorption of 17β-estradiol, estrone, estriol and equol in a wide range of soils. Specifically, for each of these four estrogens, the soil sorption coefficient (K d ) and the...
The water–wind crisscross region of the Loess Plateau in China is comprised of 17.8million hectares of highly erodible soil under limited annual rainfall. This requires a sustainable water balance for the restoration of dryland ecosystems to reduce and manage soil erosion. In this region, alfalfa has been one of the main legumes grown to minimize soil erosion. However, alfalfa yields were significantly...
A destructive magnitude (M) 7.2 earthquake (21.9° N, 120.6° E) occurred in Hengchun of Taiwan at 8:26pm on 26 December 2006. Seepage water chemistry was monitored twice a month from four routinely monitored points in the Kengting Uplifted Coral Reef Nature Reserve (KUCRNR) around Hengchun from January 2002 to December 2007. The different variants were presented for pH, conductivity, Na, K, Ca, Mg,...
Histosols are potentially important in the global carbon cycle, since they show significant carbon accumulation. Variations in Histosol features may influence both vegetation types and carbon storage amounts and rates. In this paper, we compare Histosols of the Lower Orinoco River Delta by examining relationships among the vegetation communities they maintain and differences among organic and mineral...
The fractionation of H isotopes in global precipitation leads to a continuous decrease in 2 H concentrations of precipitation with increasing latitude, altitude and continentality. Thus, the local precipitation, soil and ground water used by plants for photosynthesis or consumed during neoformation of pedogenic clay minerals often have a spatially diagnostic δ 2 H value. We hypothesize...
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