نتایج جستجو برای: soil 1
تعداد نتایج: 2900762 فیلتر نتایج به سال:
[1] Soil surface CO2 efflux is an important component of the carbon cycle in terrestrial ecosystems. However, our understanding of mechanistic controls of soil CO2 production and transport is greatly limited. Amultilayer process-based soil CO2 effluxmodel (PATCIS) wasused to evaluate soilCO2production and transport in theDukeForest.CO2production in the soil is the sum of root respiration and so...
Phosphogypsum (PG) is produced as a solid waste from phosphatic fertilizer plants. The waste slurry is disposed off in settling ponds or in heaps. This solid waste is now increasingly being used as a calcium supplement in agriculture. This study reports the effectof PG amendmenton soil physico chemical properties, bacterial and fungal count and activities of soil enzymes such as invertase, cell...
We report concentrations of cosmogenic l°Be ( t l / 2 = 1.5 x 10 6 y r s ) in soil excavated from a soil-mantled hillslope in Black Diamond Mines Regional Park, Contra Costa County, California. The most striking features of the data are: (1) the similarity in the downward decreasing trends of 1°Be concentrations in two soil profiles collected 75 m apart, (2) the coincidence in each soil profile...
This study analysed PCB-contaminated natural soil excavated from an area adjacent to an electrical transformer station in Zadar, Croatia. For one year, PCB concentrations were measured in the soil and leachate water under natural climatic conditions. After 12 months, a negligible quantity of Aroclor 1248 (0.024% in average) and a total of seven key PCB congeners (IUPAC No: PCB-28, PCB-52, PCB-1...
This study was initiated to explore the effects of ozone (O3) exposure on potted wheat roots and soil microbial community function. Three treatments were performed: (1) Air with daily averaged O3 concentration of 4–10 ppb (control situation, CK), (2) Air plus 8 h averaged O3 concentration of 76.1 ppb (O3-1), and (3) Air plus 8 h averaged O3 concentration of 118.8 ppb (O3-2). In treatments with ...
Greenhouse gas (GHG) emissions are an important part of the carbon (C) and nitrogen (N) cycle in forest soil. However, soil greenhouse gas emissions in dawn redwood (Metasequoia glyptostroboides) stands of different ages are poorly understood. To elucidate the effect of plantation age and environmental factors on soil GHG emissions, we used static chamber/gas chromatography (GC) system to measu...
The effect of cattle grazing on the soil nematode and protozoan communities, and on microbial biomass, was measured in Israel’s northern highlands. Three grazing areas were compared: (1) with 1 1 cow ha 1 y ; (2) 0 55 cow ha 1 y ; and (3) control—no grazing for almost 18 years. Soil samples were collected from the upper 10 cm level of each area (n1⁄4 24), in autumn, before the onset of the rain...
How soil microbes assimilate carbon-C, nitrogen-N, phosphorus-P, and sulfur-S is fundamental for understanding nutrient cycling in terrestrial ecosystems. We compiled a global database of C, N, P, and S concentrations in soils and microbes and developed relationships between them by using a power function model. The C:N:P:S was estimated to be 287:17:1:0.8 for soils, and 42:6:1:0.4 for microbes...
BACKGROUND The coexistence of Cd2+ and Zn2+ ions in nature has a significant influence on their environmental behaviors in soils and bioavailability for plants. While many studies have been done on the mutual toxicity of Cd2+ and Zn2+, few studies can be found in the literature focused on the interaction of Cd2+ and Zn2+ on soil clay fractions especially in terms of energy relationship. RESUL...
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