scholarly journals Biogeomorphological responses of nebkhas to historical long-term land uses in an arid coastal aeolian sedimentary system

Geomorphology ◽  
2020 ◽  
Vol 368 ◽  
pp. 107348 ◽  
Author(s):  
Néstor Marrero-Rodríguez ◽  
Leví García-Romero ◽  
Carolina Peña-Alonso ◽  
Antonio I. Hernández-Cordero
Keyword(s):  
Land Uses ◽  
Sedimentary System

scholarly journals Historical social relevance of ecosystem services related to long term land uses in a coastal arid aeolian sedimentary system in Lanzarote (Canary Islands, Spain)

2021 ◽  
Vol 210 ◽  
pp. 105715
Author(s):  
Néstor Marrero-Rodríguez ◽  
Carolina Peña-Alonso ◽  
Leví García-Romero ◽  
María José Sánchez-García ◽  
Emma Pérez-Chacón Espino
Keyword(s):  
Ecosystem Services ◽  
Canary Islands ◽  
Land Uses ◽  
Social Relevance ◽  
Sedimentary System

Topsoil characteristics of three contrasting New Zealand soils under four long‐term land uses

2000 ◽  
Vol 43 (4) ◽  
pp. 569-583 ◽  
Author(s):  
Graham P. Sparling ◽  
T. Graham Shepherd ◽  
Louis A. Schipper
Keyword(s):  
New Zealand ◽  
Land Uses

Geochemical Behaviour of Uranium in Sedimentary Formations: Insights From a Natural Analogue Study

2009 ◽  
Author(s):  
Ulrich Noseck ◽  
Vaclava Havlova ◽  
Juhani Suksi ◽  
Thomas Brasser ◽  
Radek Cervinka
Keyword(s):  
Current Knowledge ◽  
Natural Analogue ◽  
Near Surface ◽  
Co2 Partial Pressure ◽  
Long Term Stability ◽  
Reducing Conditions ◽  
Phosphate Mineral ◽  
Sedimentary System ◽  
The Impact

Groundwater data from the natural analogue site Ruprechtov have been evaluated with special emphasis on the uranium behaviour in the so-called uranium-rich clay/lignite horizon. In this horizon in-situ Eh-values in the range of −160 to −280 mV seem to be determined by the SO42−/HS− couple. Under these conditions U(IV) is expected to be the preferential redox state in solution. However, on-site measurements in groundwater from the clay/lignite horizon show only a fraction of about 20% occurring in the reduced state U(IV). Thermodynamic calculations reveal that the high CO2 partial pressure in the clay/lignite horizon can stabilise hexavalent uranium, which explains the occurrence of U(VI). The calculations also indicate that the low uranium concentrations in the range between 0.2 and 2.1μg/l are controlled by amorphous UO2 and/or the U(IV) phosphate mineral ningyoite. This confirms the findings from previous work that the uranium (IV) mineral phases are long-term stable under the reducing conditions in the clay/lignite horizon without any signatures for uranium mobilisation. It supports the current knowledge of the geological development of the site and is also another important indication for the long-term stability of the sedimentary system itself, namely of the reducing geochemical conditions in the near-surface (30m to 60 m deep) clay/lignite horizon. Further work with respect to the impact of changes in redox conditions on the uranium speciation is on the way.

Leaf decomposition of cork oak under three different land uses within a montado of southern Portugal

Soil Research ◽  
2017 ◽  
Vol 55 (3) ◽  
pp. 215
Author(s):  
Maria Luísa Arosa ◽  
Sofia R. Costa ◽  
Helena Freitas
Keyword(s):  
Soil Nutrient ◽  
Cork Oak ◽  
Habitats Directive ◽  
Land Uses ◽  
Leaf Fall ◽  
Long Term Effects ◽  
Ecological Processes ◽  
Climate Conditions ◽  
Southern Portugal

This study compared litter decomposition dynamics of cork oak at three sites under different land-uses (grassland, shrubland and woodland), in a montado ecosystem in Southern Portugal. The montado is a protected habitat within the EU Habitats Directive, but the long-term persistence of cork oak is endangered in these ecosystems, with health of poor cork oak and low natural regeneration rates being the main causes of degradation. Moreover, human management has resulted in the conversion of woodlands to grasslands and may have long-term effects on soil nutrient availability, eventually modifying soil nutrient budgets. Knowledge of the ecological processes is therefore relevant for ecosystem management and species conservation. In the study, the estimated amount of leaf fall from cork oak showed no significant differences between land uses, despite the positive influence of tree crown size on leaf fall. Decomposition was affected by season, vegetation cover, leaf thickness and litter quality. Differences in land use that exposed soil to harsh climate conditions negatively affected soil microbial dynamics, resulting in lower decomposition rates in the more disturbed sites with lower canopy cover.

A Long-Term Forecast Analysis On Worldwide Land Uses

2006 ◽  
Vol 119 (1-3) ◽  
pp. 609-620 ◽  
Author(s):  
Wenjun Zhang ◽  
Yanhong Qi ◽  
Zhiguo Zhang
Keyword(s):  
Land Uses ◽  
Term Forecast

scholarly journals Impact of land use change on organic carbon sequestration in Arenosol

2019 ◽  
Vol 28 (1) ◽  
Author(s):  
Asta Kazlauskaite-Jadzevice ◽  
Liudmila Tripolskaja ◽  
Jonas Volungevicius ◽  
Eugenija Baksiene
Keyword(s):  
Organic Carbon ◽  
Arable Land ◽  
Land Conversion ◽  
Land Uses ◽  
Arable Soils ◽  
Ap Horizon ◽  
Soc Stock ◽  
Organic Carbon Sequestration ◽  
Pine Forest Soil

Conversion of arable soils into other land uses can stabilize and increase accumulation of soil organic carbon (SOC) and in addition prevent deterioration in its properties. The data has shown changes in SOC sequestration in Ap horizon after arable land conversion (1995–2015) into managed grassland, abandoned and pine afforested. SOC in Arenosol topsoil was positively affected by long term fallow and conversion into grassland. Abandoned land and fertilised managed grassland accumulated significantly more SOC, 48% and 38% respectively compared with arable land. In unfertilised managed grassland SOC stocks decreased 2.3% during 21 years, but losses were lower than in fertilised arable land. Pine afforestation of loamy sand helped to reduce the intensity of SOM mineralization compared to arable land. The Ap horizon thickness in pine forest soil increased from 28 to 31 cm during 21 years period. However, SOC stock decreased by 1% due to reduction in carbon concentration.

scholarly journals Effects of Long-Term Crop-Livestock-Forestry Systems on Soil Erosion and Water Infiltration in a Brazilian Cerrado Site

2019 ◽  
Vol 11 (19) ◽  
pp. 5339 ◽  
Author(s):  
Jullian Souza Sone ◽  
Paulo T. Sanches de Oliveira ◽  
Pedro A. Pereira Zamboni ◽  
Nelson O. Motta Vieira ◽  
Glauber Altrão Carvalho ◽  
...  
Keyword(s):  
Soil Erosion ◽  
Soil Loss ◽  
Agricultural Land ◽  
Bare Soil ◽  
Water Infiltration ◽  
Land Uses ◽  
Brazilian Cerrado ◽  
No Till ◽  
One Year

Integrating agricultural land uses is a suitable alternative for fostering economic development and improving food security. However, the effects of long-term integrated systems on soil erosion and water infiltration are still poorly understood. Here, we investigate the influence of different agricultural land uses on soil erosion and water infiltration in an Oxisol site located in the Brazilian Cerrado region. The experimental area consisted of continuous grazing under variable stocking rates with regular fertilization (CG-RF), continuous cropping under no-till (CC-NT) and no-till with 4-year subsoiling (CC-SS), rotation of one year cropping and three years livestock in the livestock phase (C1-L3), rotation of four years cropping and four years livestock in the cropping phase (CL-4C) and in the livestock phase (CL-4L), and integrated crop-livestock-forestry in the cropping phase (CLF-C) and in the livestock phase (CLF-L). To evaluate water infiltration and soil loss, we used a rainfall simulator with a constant rainfall intensity of 74.9 ± 3.6 mm h−1 in plots of 0.7 m2. We carried out 72 rainfall simulations comprising four repetitions in each treatment under vegetation and bare soil. Stable infiltration rate (SIR) ranged from 45.9 to 74.8 mm h−1 and 19.4 to 70.8 mm h−1 under vegetation covers and bare soil, respectively. Our findings indicated that SIR values under CLF-C were 60% greater than under CG-RF. We also found that soil loss rates under CLF-C were 50% smaller than under CG-RF. The crop–livestock rotation period that presented better results of SIR and soil loss was one year of cropping and three years of livestock (C1-L3). Overall, we noted that SIR and soil loss values under CLF-C are similar to the Cerrado native vegetation. Therefore, our study reveals the opportunity to increase agricultural production, improve food supply, and reduce soil erosion with adequate soil and agricultural management.

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