Search results for "HuMu"
showing 10 items of 132 documents
Alfalfa crops amended with MSW compost can compensate the effect of salty water irrigation depending on the soil texture
2018
The availability of water resources of marginal quality such as drainage water or high-saltcontaining groundwater is turning into an important issue in Tunisia and other countrieswith scarce water resources. A pot experiment was carried out to evaluate plant produc-tion, nutrient content and heavy metal bioaccumulation in agricultural soils amended withMSW compost and irrigated with salty water, by using two different soil textures (clay andsandy). Salt water supply decreased plant dry yield in both soils. Salt stress had signifi-cantly reduction in plant biomass in sandy soil compared to those in clay soil (biomass ofdry weight is significantly higher in clay soil than those in sandy soil …
Distribution of soil animals in patchily contaminated soil
1996
Abstract Distribution of soil animals with respect to patchy chemical contamination was studied in microcosms containing reconstituted coniferous forest floor. Soil materials were defaunated and soil organisms were reinoculated into a mesh basket in the centre of each microcosm. Part of the humus layer was contaminated with three concentrations of sodiumpentachlorophenate (0, 50 or 500 mg PCP kg −1 of dry humus) and put into mesh baskets (two per concentration) around the central patch. No differences in dispersion ability from the reinoculated patch were found between microarthropod species. PCP decreased microbial biomass in the humus. Numbers of collembolans were significantly lower in t…
Sensitivity of soil processes in northern forest soils: are management practices a threat?
2000
Abstract There is evidence that forest management practices influence soil-decomposer communities. It is also established that changes in the trophic structure and composition of these communities can induce changes in soil-nutrient dynamics, thereby affecting plant growth. Whether forest productivity is affected by management-induced changes in, e.g. soil faunal structure, is, however, yet to be shown. The aim of this study was (1) to determine the resolution of the ecological hierarchy (e.g. species, functional groups, trophic levels) at which a change in soil fauna would alter biotically-controlled processes in soils, and (2) to examine the sensitivity of soil fauna of the boreal forest …
Habitat patchiness affects decomposition and faunal diversity: a microcosm experiment on forest floor.
1998
Environmental heterogeneity has been intensively studied, but little is known about relationships between habitat patchiness and soil processes. The aim of this study was to investigate (1) the impact of patchiness of the litter layer on the decomposer community and litter decomposition rate, and (2) whether the impact of soil fauna on the rates of processes differs in relation to patchiness. An experiment was carried out in microcosms with coniferous forest humus and four kinds of litter with different C:N ratios or stages of decomposition, either separately (i.e. in patches) or mixed with each other. Microarthropod species diversity was better maintained in the patchy systems. In the abse…
Distribution of sulphur forms in soils from beech and spruce forests of Mont Loz�re (France)
1993
From a quantitative inventory of sulphur forms and sulphur budget, the relation between the distribution of the various sulphur forms and the sulphate fluxes in three soil profiles has been addressed. These profiles are located in two forested watersheds at Mont Lozere. One has been sampled in a beech forest and the other two in a spruce forest and in a harvested plot of this spruce forest, respectively. The mean annual input-output budgets showed a sulphur immobilization in the soil cover of the three plots. In the preserved spruce forest plot, because of larger dry depositions, the sulphur immobilization is much greater than in other plots and occurs essentially in the B horizons. In the …
Vertical stratification of bacteria and archaea in sediments of a small boreal humic lake
2019
ABSTRACT Although sediments of small boreal humic lakes are important carbon stores and greenhouse gas sources, the composition and structuring mechanisms of their microbial communities have remained understudied. We analyzed the vertical profiles of microbial biomass indicators (PLFAs, DNA and RNA) and the bacterial and archaeal community composition (sequencing of 16S rRNA gene amplicons and qPCR of mcrA) in sediment cores collected from a typical small boreal lake. While microbial biomass decreased with sediment depth, viable microbes (RNA and PLFA) were present all through the profiles. The vertical stratification patterns of the bacterial and archaeal communities resembled those in mar…
Urheilujournalismi vallan vahtikoirana? : tapauskohtaisessa tarkastelussa huippu-urheilun muutostyötä käsittelevä uutisointi suomalaisissa sanomalehd…
2018
Artikkelin tutkimuskohteena on suomalaisen sanomalehdistön uutisointi vuosina 2010–2012 tehdystä huippu-urheilun muutostyöstä, jota opetus- ja kulttuuriministeriö rahoitti 2,6 miljoonalla eurolla. Tutkimuksen tavoitteena on selvittää, millainen vallan vahtikoira urheilujournalismi on. Tutkimusaineisto koostuu levikiltään kolmen Suomen suurimman päivälehden (Aamulehti, Helsingin Sanomat ja Turun Sanomat) ja maan molempien iltapäivälehtien (Iltalehti ja Ilta-Sanomat) kaikesta muutostyötä käsittelevästä uutisoinnista lehtien painetuissa versioissa. Tarkasteluajanjakso on rajattu Huippu-urheilun muutosryhmän (HuMu) loppuraportin julkistamista (5.12.2012) seuranneelle puolen vuoden ajalle (6.12.…
Vieglo stabilo izotopu attiecību pētījumi humusvielu veida un izcelsmes raksturošanai
2019
Vieglо stаbilо izоtоpu аttiecību pētījumi humusvielu veidа un izcelsmes rаksturоšаnаi. Petuhоvа О., zinātniskаis vаdītājs prоf., Dr. chem. Vīksnа А., 61 lаppuses, 25 аttēli, 3 tаbulаs, 64 literаtūrаs аvоti. Lаtviešu vаlоdā. Mаģistrа dаrbа ietvаrоs tikа izpētītа аttiecīgā zinātniskā, metоdiskā un mācību literаtūrа pаr humusvielām un tо izdаlīšаnаs metоdēm, izmаntоšаnаs iespējām. Tikа аnаlizēti humīnskābju un fulvоskābju pаrаugi, kаs izdаlīti nо Eipurа purvа dаžādiem dziļumiem. Humusvielām, lietоjоt vieglо stаbilо izоtоpu аttiecību mаsspektrоmetriju, nоteicа δ13C un δ15N. Izmаntоjоt FTIR-АTR, KBr, DRIFT un PАS, humusvielu IS spektri tikа uzņemti un аnаlizēti.
Effects of Terbuthylazine on Soil Fauna and Decomposition Processes
1996
Abstract Acute lethal and sublethal effects of terbuthylazine and the commercial herbicide preparation Gardoprim [terbuthylazine is the active ingredient (a.i.)] on soil organisms (microbes, oppioid mites, two gamasid mite species, enchytraeids, and nematodes) were studied. In the humus soil terbuthylazine had no toxic effects on soil animals tested. However, the herbicide preparation had acute toxic effects on enchytraeids [no-observed-effect level (NOEL) 1.0 g a.i./m 2 ] and both gamasid mites (NOEL 2.4 and 5.0 g a.i./m 2 ). According to filter paper test, the LC 50 value for oppioid mites was 14.5 g a.i./m 2 . In the humus soil the commercial preparation caused no dose-related mortality …
Calibration of in situ chlorophyll fluorometers for organic matter
2019
AbstractOrganic matter (OM) other than living phytoplankton is known to affect fluorometric in situ assessments of chlorophyll in lakes. For this reason, calibrating fluorometric measurements for OM error is important. In this study, chlorophyll (Chl) fluorescence was measured in situ in multiple Finnish lakes using two sondes equipped with Chl fluorometers (ex.470/em.650–700 nm). OM absorbance (A420) was measured from water samples, and one of the two sondes was also equipped with in situ fluorometer for OM (ex.350/em.430 nm). The sonde with Chl and OM fluorometers was also deployed continuously on an automated water quality monitoring station on Lake Konnevesi. For data from multiple lake…