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Fragipan horizons are naturally occurring impermeable layers found in certain soil types which constrain crop yields. While abundant literature exists regarding the processes of fragipan genesis, there is little recognition given to potential alterations in the pan with surface management, particularly important in light of the fact that these horizons can occur near the surface. We collected soil...
Crop yield response to nitrogen (N) application has been well documented, but quantitatively tracing the distribution of exogenous straw derived N (straw-N) in a soil-plant system amended by plastic film mulching and fertilizers is poorly understood. Focus on this, we used a 15N tracer, applied as maize straw, into a monoculture maize field experiment in China to quantify the distribution of straw-N...
In order to differentiate the effects of root functioning and aboveground litter inputs on soil bacterial communities, a pot experiment was designed using different combinations of three plant species with contrasting chemical characteristics (0, 1, 2 or 3 species per plot) grown with or without aboveground litter inputs from the same plant species (no litter, litter from 1 of the species, or litter...
This study aimed to compare soil physicochemical properties and mineralogical compositions, including the cohesive force and internal friction angle, using direct shear tests with designed water contents and temperatures, between noncollapsible soil and collapsed gullies. Two pedons were collected from Longmen Town (Anxi County, Fujian Province) with severely collapsed gullies that developed from...
Nitrite (NO2−) is an intermediate in a number of soil N transformations, and is a precursor for NO and N2O emissions. Due to the transient nature of NO2− it is often neglected in N cycling research. Thus, the full suite of production and consumption pathways of NO2− in terrestrial ecosystems is poorly understood. The primary objectives of this study were to clarify the production and consumption pathways...
The aim of this work was to study the effects of the parameters involved in persulfate (PS) application, namely, the cation counterion, mode of persulfate addition and soil-moisture content, to optimize the use of low doses of PS coupled with bioremediation technologies. Soil microcosms were contaminated with 110±20mg of phenanthrene per kilogram of dry soil. The efficiency of each treatment in phenanthrene...
Opencast coal mining activities trigger considerable alteration of soil structure, and characterizing the spatial variability of soil particle size distribution (PSD) quantitatively can contribute to understand mined soil properties and perform mined land rehabilitation. In this study, a novel method combining multi-fractal and geo-statistics was used to quantify the spatial variability of PSD in...
Soil spatial variability may exhibit nonlinearity and this has been assumed in studies without proper quantification. Owing to the complexity of underlying biogeochemical processes, greenhouse gas emission, in particular, nitrous oxide (N2O) flux from soil, is highly variable over space and time. The goal of this work was to examine the nonlinearity associated with the spatial series of N2O flux from...
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