Greenhouse gas measurements along polar ice cores provide important insight into the former composition of the atmosphere, its natural variations, and the responses to fast climatic changes in the past. We present high-resolution nitrous oxide (N2O)…
Papers in Earth Sciences
Miscellaneous papers in Earth Sciences, N
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Pasture and wetland soils are regarded as the major source of nitrous oxide (N2O) and dinitrogen (N2) emissions as they receive regular inputs of N from various sources. To understand the factors affecting N2O and N2 emissions and their ratio as…
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1 This study investigated how nitrogen (N) fertilization with 200 kg N ha 1 of a 58-yearold West Coast Douglas fir stand influenced its net greenhouse gas (GHG) global warming potential (GWP) in the first year after fertilization. Effects of…
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The Upper Lerma is a high altitude basin with three water bodies linked by the Lerma River. This basin has a long archaeological history,characterised by the establishment of settlements within the lacustrine ecosystem itself (man-made islands)…
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Nitrogen (N) and phosphorus (P) availability limit plant growth in most terrestrial ecosystems. This review examines how variation in the relative availability of N and P, as reflected by N : P ratios of plant biomass, influences vegetation…
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The southern Yucatán contains the largest expanse of seasonal tropical forests remaining in Mexico, forming an ecocline between the drier north of the peninsula and the humid Petén, Guatemala. The Calakmul Biosphere Reserve resides in the center of…
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The interface between nanosystems and biosystems is emerging as one of the broadest and most dynamic areas of science and technology, bringing together biology, chemistry, physics, biotechnology, medicine, and many areas of engineering. The…
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Methods based on self-assembly, self-organization, and forced shape transformations to form synthetic or semisynthetic enclosed lipid bilayer structures with several properties similar to biological nanocompartments are reviewed. The procedures…
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Nature produces a wide variety of exquisite mineralized tissues, fulfilling diverse functions. Organisms exercise a level of molecular control over the detailed nano- and microstructure of the biomaterials that is unparalleled in todays technology.…
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We investigated N cycling and denitrification rates following five years of N and dolomite amendments to whole-tree harvested forest plots at the long-term soil productivity experiment in the Fernow Experimental Forest in West Virginia, USA. We…
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Most soil organic matter (SOM) derives from plant material, but there are substantial gaps in our understanding of its transformation mechanisms. Alterations that occur as SOM decays and is stabilized have proved difficult to study owing largely to…
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To better constrain the dynamics of the dissolved organic nitrogen DON) pool and the role of N-2 fixation in the nitrogen cycle at the Bermuda Atlantic Time- series Study BATS) site, we measured the N-15/(14) N ratio of total nongaseous nitrogen…
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Net N mineralization, nitrification, and N uptake were monitored in the A (08 cm) and B (830 cm) soil horizons from 1997 to 1999 across a chronosequence of upland hardwood forest stands in southern Indiana, USA. Stand ages were 1, 6, 12, 31, and…
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The tensions between development and preservation of tropical forests heighten the need for integrated assessments of deforestation processes and for models that address the fine-tuned location of change. As Mexico's last tropical forest frontier,…
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The Pampean Ranges (PR) of Argentina are a region of active thick-skinned deformation between stable cratonic South America and the Andes. The Tucuman Plain (TP) at the northern end of the PR lies just west of the most easterly active faults. In…
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Stream water often diverges from the main channel into sediments below the stream surface, gravel bars next to the stream, or organic debris dams in the middle of the stream. These geomorphic structures have the potential to support processes that…
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Urbanization can potentially alter watershed nitrogen (N) retention via combined changes in N loading, water runoff, and N processing potential. We examined N export and retention for two headwater catchments (similar to 4 km(2)) of contrasting land…
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The rate of N uptake of crops is highly variable during crop development and between years and sites. However, under ample soil N availability, crop N accumulation is highly related to crop growth rate and to biomass accumulation. Critical N…
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It is generally assumed that agricultural systems with perennial crops are more sustainable than systems with annual crops. Soil erosion is negligible and perennial crops have more closed nutrient cycling. Moreover, inorganic fertilizers are used…
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The %N and delta 15N values of soils and plants were measured along a chronosequence spanning 3 to 3000 Ky in a California annual grassland. Total soil N decreased with increasing soil age (1.1 to 0.4 kg N m-2) while the mean delta 15N values of the…
Papers in associated sub-disciplines
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