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The generally high apparent 14C age of soil organic carbon (SOC) in subsoils suggests a high stability against microbial degradation. However, the SOC decomposition in subsoils may also be limited by easily available substrates and nutrients, such as N and P. In topsoils, priming effects in response to substrate additions are largely determined by substrate quality which also differently affects the...
A disturbance due to selective logging causes the release of carbon from forest soils. Here, we examine this effect under Nothofagus stands in Andisols of southern Chile (39°38′S, 72°02′W, >4000mmyr−1). We postulate that soil carbon destabilization caused by forest management is counteracted by two contrasting carbon stabilization mechanisms linked to pedogenic processes: (1) the formation of allophane-imogolite-like...
The aim of the paper is to compare soil organic carbon (SOC) concentration and stock in a Rendzic Leptosol and a Dystric Andosol as two SOC-rich soil types. Because SOC differences between them are difficult to determine from soil databases, a suitable surface geological configuration of andesite lenses embedded within a flat limestone plateau was used for a direct comparison. All the other site conditions...
Visible, near-infrared and shortwave-infrared (VNIR–SWIR) spectroscopy has proven to be an efficient, rapid and low-cost method for soil spectral analysis that can improve on the results obtained from today's traditional methods of conducting soil surveys. Nonetheless, this tool is used mostly in the laboratory and at surface level. The main objective of this paper is to develop a new optical method...
The spatial heterogeneity of phosphorus (P) and different P forms in soils has implications for plant, microbial, and ecosystem P supply. Little information is available concerning the small-scale vertical and horizontal distributions of P and important variables for P binding at the soil profile scale. We assessed spatial patterns of total P and different P fractions, and of major P binding partners...
The development of a strategy to reach soil data through vegetation has the potential to improve soil mapping in large areas covered by forests. This study aimed to develop a strategy to identify the relationship between soil information, such as texture, fertility and pedological classes, through vegetation spectral sensing obtained by a satellite sensor. The study area is located in Angola, Africa,...
Most soil structure-related physical properties are correlated to soil organic carbon (SOC) content. Texture, mineralogy, and SOC:clay ratio are also acknowledged to affect physical properties, however there is no consensus or general conclusions in this respect. Against this background, the present study aims at determining objectives for the management of SOC in terms of structural quality of agricultural...
The late Miocene was characterized by high global temperatures and partly to nearly complete desiccation of the Mediterranean Sea throughout the latter part of the Messinian age (the Messinian salinity crisis). The non-marine paleoenvironmental and paleoclimatic records from the Mediterranean area are highly limited in their spatial range. Late Miocene river flood-plain sediments in the Central Anatolian...
The soil water retention curve (SWRC) is a unique relationship between water content and soil water potential. SWRC in near saturation gives the dimension of soil macroporosity which plays an important role in water translocation into soil. Thus, the accurate measurement of SWRC is crucial. The aim of this study is to compare SWRC obtained through two different methods: X-ray computed microtomography...
Water-extractable organic matter (WEOM) is the most dynamic and bioavailable fraction of the soil organic matter pool. Although the litter floor is considered the main source of WEOM, roots also release a great amount of labile organic compounds through rhizodeposition processes. This makes the rhizosphere, the small soil volume in proximity to the roots, a soil compartment relatively enriched in...
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