Browsing by Author "Siebielec, Grzegorz"
Now showing 1 - 20 of 27
Results Per Page
Sort Options
Item Assessment of soil impact on pre- and post-harvest NDVI extrema by machine learning(Polskie Towarzystwo Gleboznawcze, 2024-06-01) Łopatka, Artur; Koza, Piotr; Suszek-Łopatka, Beata; Siebielec, Grzegorz; Jadczyszyn, JanIt was observed that the difference in the maximum and minimum NDVI values at a time close toharvest (mxNDVI and mnNDVI, respectively), referred to as the haNDVI index (harvest amplitudeof NDVI), correlates with agricultural soil quality and the share of sowings. The NDVI becomes satu-rated when the values of the Leaf Area Index (LAI) signi ficantly exceed one so spatial variation inhaNDVI is mainly due to the minimum post-harvest NDVI (mnNDVI). To explain the variability ofmnNDVI values three hypotheses were formulated: i) impact of crop selection, ii) field size impact,and iii) impact of soil. To determine which of these hypotheses had the highest impact on the vari-ation in the mnNDVI, the developed machine learning models of this indicator were subjected toa test removing individual explanatory variables from them. Removing a variable does not causea signi ficant increase in model error if a variable does not contribute useful information to themodel. This test showed that the mnNDVI index depends almost exclusively on the crop indicatorwhich was the median of mnNDVI for crops, not directly from soil variables such as the agriculturalquality of soil or soil moisture. According to this, the hypothesis of direct impact of soil was rejected.The explanation for the observed correlation of haNDVI with soil quality is the agricultural practiceof choosing crops with low mnNDVI (cereals, rapeseed) at better soil conditions and crops with highmnNDVI (fodder crops, grassland) for worse soil conditions.Item Bioróżnorodność gleb(Instytut Uprawy Nawożenia i Gleboznawstwa Państwowy Instytut Badawczy, 2020) Siebielec, Grzegorz; Siebielec, SylwiaItem Comparing Effects of Soil Amendments on Plant Growth and Microbial Activity in Metal-Contaminated Soils(MDPI, 2025-03-01) Siebielec, Sylwia; Siebielec, GrzegorzPhytostabilization of metals involves the inactivation of metals in the soil through the use of various materials as soil amendments, which reduces the bioavailability of metals, and then the introduction of vegetation. There are limited data comparing the effectiveness of different phytostabilization amendments under the same soil and environmental conditions. Therefore, the aim of this research was to compare the effectiveness of a range of soil amendments on reducing the extractability of metals, metal uptake by plants, microbial activity in soil and nutrient availability to plants. Eight materials potentially limiting metal availability were used in a pot experiment: two composts (CG, CM), municipal biosolids (SB), bentonite (BEN), phosphorus fertilizer (PF), amorphous iron oxide (FE), waste rock material (WR), calcium carbonate (LM); and these materials were compared with typical fertilization (NPK) and an untreated soil as the control (CTL). The following trace metal-contaminated soils were used in the pot experiment: soil taken from the area of strong dust fall from the zinc and lead smelter (soil P); soil taken from an outcrop of ore-bearing rocks near a smelter waste heap (soil H); soil artificially polluted through smelter dust spill in the 1990s (soil S). In general, the greatest yields of plants (oat and white mustard) were recorded for compost-treated soils. Changes in the solubility of zinc (Zn) and cadmium (Cd) after the application of various amendments largely reflected changes in soil pH. Biosolids caused a significant increase in extractable Zn and Cd, which was related to the decrease in soil pH, while a significant reduction in Cd extractability was observed across soils after the application of both composts, especially the compost characterized by alkaline pH. Interestingly, low extractability of Cd in the soil with the addition of another compost was observed, despite the pH decrease, as compared to the control pots. This fact proves the high sorption capacity of the compost towards Cd. The microbiological analyses revealed the highly beneficial effect of composts for dehydrogenases and nitrification activities, and for soil respiration, whereas soil amendment with iron oxide caused an increase in respiration activity across soils.Item COMPARISON OF MICROBIAL AND CHEMICAL CHARACTERISTICS OF SOIL TYPES AFTER OVER 100 YEARS OF CEREAL PRODUCTION(Instytut Uprawy Nawożenia i Gleboznawstwa – Państwowy Instytut Badawczy w Puławach) Siebielec, Grzegorz; Siebielec, Sylwia; Podolska, GrażynaItem Egzogenna materia organiczna jako element Europejskiego Zielonego Ładu(Instytut Uprawy Nawożenia i Gleboznawstwa Państwowy Instytut Badawczy, 2021) Siebielec, Grzegorz; Siebielec, Sylwia; Kaczyński, Radosław; Gmur, Dominika; Koza, PiotrItem Enterobacteriaceae in Sewage Sludge and Digestate Intended for Soil Fertilization(MDPI, 2024) Wójcik-Fatla, Angelina; Farian, Ewelina; Kowalczyk, Katarzyna; Sroka, Jacek; Skowron, Piotr; Siebielec, Grzegorz; Zdybel, Jolanta Małgorzata; Jadczyszyn, Tamara; Cencek, TomaszSubstances of organic origin are seeing increasing use in agriculture as rich sources of nutrients for plants. The aim of this study was to determine the microbiological contamination of sewage sludge and digestate to assess their safe use as fertilizers in Poland. The assessment of microbial soil, sewage sludge and digestate contamination was based on the total number of mesophilic bacteria and Gram-negative bacteria from the Enterobacteriaceae family. The presence of Escherichia coli and Salmonella spp. was identified via culture and the presence of Enterobacteriaceae species was determined via biochemical and molecular methods. In laboratory conditions, the survival of E. coli in soil fertilized with sewage sludge or digestate inoculated with a reference strain was determined. The average concentration of Enterobacteriaceae in soil, sewage sludge and digestate samples was 1.1 × 104 CFU/g, 9.4 × 105 CFU/g and 5.6 × 106 CFU/g, respectively. Escherichia coli was detected in all sample types. From the soil samples, Serratia, Enterobacter, Pantoea, Citrobacter and Pseudomonas genera were identified the most frequently, while in sewage sludge and digestate, E. coli was predominant. Based on the results of our laboratory experiment, it can be concluded that after three weeks, fertilization with organic waste in acceptable doses does not significantly increase soil contamination with Enterobacteriaceae.Item Enzymatic activity in soil treated with exogenous organic matter(Instytut Uprawy Nawożenia i Gleboznawstwa – Państwowy Instytut Badawczy w Puławach, 2021) Siebielec, Sylwia; Siebielec, Grzegorz; Ukalska-Jaruga, Aleksandra; Urbaniak, MagdalenaItem Fires in the face of climate change: Indicators of fire disturbance in heath areas – Inference from military training lands(Elsevier, 2024) Krawczyk, Rafał; Osyczka, Piotr; Siebielec, Grzegorz; Nobis, MarcinGlobal warming significantly affects the frequency and intensity of wildfires in many fire-prone areas of the world and fire disturbance regimes are changing rapidly. Alongside this, controlled burning is often considered or implemented as an alternative method for nature protection. Here, we studied the post-fire secondary succession in dry heath habitat located in military training grounds to recognise the impact of fire on the effectiveness and rate of ecosystem recovery. We focus particularly on identifying indicator species for a given successional phase of Central European dry heath habitats and assessing their value for dating the last fire disturbance. The research involved 60 vegetation patches (plots of 25 m2), which were assigned to four post-fire age classes, namely: 1–5 years (Class A), 6–10 years (Class B), 11–15 years (Class C), and >15 years (Class D). In each study plot, species diversity and coverage of lichens, bryophytes and vascular plants were examined in addition to the physicochemical properties of the soil substrate. Cryptogams and vascular plants clearly differ in terms of the secondary succession pattern; specific sets of cryptogams correspond well to particular post-fire classes and are therefore good determinants of the post-fire succession stage. Spontaneous succession of plant vegetation eventually leads to complete recovery of the heath in a relatively short time. Nevertheless, great vegetation dynamics in the first years after a fire disturbance may result in seemingly different directions of succession. Post-fire classes did not differ noticeably in terms of soil properties, it follows that the effects of fire on soil conditions are negligible; though, a significant upward trend was observed for exchangeable form of K throughout the succession process. Our results indicate that sporadic fires reduce the undesirable overgrowth of heathlands or psamophilous grasslands and generally have a little negative side-effect on the ecosystem. The revealed succession patterns and defined sets of species characteristic for subsequent post-fire age classes are applicable to dating fire disturbances, regardless of whether the fire was planned or spontaneous.Item Integrating Expert Assessments and Spectral Methods to Evaluate Visual Attractivness and Ecosystem Services of Urban Informal Green Spaces in the Context of Climate Adaptation(MDPI, 2025) Kamiński, Jan ; Głowienka, Ewa; Soszyński, Dawid; Trzaskowska, Ewa; Stuczyński, Tomasz; Siebielec, Grzegorz; Poręba, LudwikaThis study aimed to develop criteria for the expert assessment of the visual attractiveness of informal urban green spaces and compare these results with indicators derived from spectral indices and geospatial data. The research was conducted in Lublin, Poland, a medium-sized European city. The expert assessment evaluated the overall attractiveness, naturalness, landscape contrast, and uniqueness. The results were juxtaposed with spectral indices, such as the Normalized Difference Vegetation Index (NDVI), Leaf Area Index (LAI), and land surface temperature, which were calculated for the target areas and a 300 m buffer surrounding them. The analyses revealed strong correlations between the expert ratings and spectral indices. For example, overall attractiveness was linked to lower temperatures, while landscape contrast exhibited a relationship with temperature differentials. Moreover, areas with greater landscape contrast showed larger index differences between the site and the buffer. Positive correlations were also observed between attractiveness and land slope. Importantly, the spectral indices highlighted the ecological value of some sites that received lower expert assessments, such as areas dominated by shrubs and bushes. This research introduces the concept of ‘enchanted natural places’ (ENPs) as a framework for identifying and formalizing the protection of visually and ecologically valuable, informal green spaces. The integration of expert evaluations with spectral data provides a novel, robust methodology for assessing urban green spaces, bridging subjective perceptions and objective environmental indicators. This approach underscores the importance of informal green spaces not only for aesthetic and ecological benefits but also for supporting biodiversity and mitigating urban heat islands, contributing to urban resilience in the face of climate change.Item Materia organiczna w glebach mineralnych Polski(Instytut Uprawy Nawożenia i Gleboznawstwa Państwowy Instytut Badawczy, 2020) Siebielec, Grzegorz; Łopatka, Artur; Smreczak, Bożena; Kaczyński, Radosław; Siebielec, Sylwia; Dach, JacekItem Mikroorganizmy solubilizujace fosforany znaczenie w rolnictwie i remediacji(Instytut Uprawy Nawożenia i Gleboznawstwa Państwowy Instytut Badawczy) Siebielec, Sylwia; Kozieł, Monika; Siebielec, Grzegorz; Woźniak, MałgorzataItem Occurrence of Azotobacter spp. in cultivated soils in Poland(Instytut Uprawy Nawożenia i Gleboznawstwa – Państwowy Instytut Badawczy w Puławach, 2021) Kozieł, Monika; Martyniuk, Stefan; Siebielec, GrzegorzItem Ocena efektywności symbiotycznej szczepów bakterii z rodzaju Rhizobium wyizolowanych z brodawek korzeniowych bobiku (Vicia faba L. Var. Minor) i grochu (Pisum sativum L.)(Instytut Uprawy Nawożenia i Gleboznawstwa Państwowy Instytut Badawczy, 2017) Kozieł, Monika; Siebielec, Sylwia; Siebielec, Grzegorz; Martyniuk, StefanItem Ocena przekształcania i zasklepiania gleb użytków rolnych na cele urbanizacji(Instytut Uprawy Nawożenia i Gleboznawstwa Państwowy Instytut Badawczy, 2018) Jadczyszyn, Jan; Siebielec, Grzegorz; Łopatka, Artur; Koza, PiotrItem Ocena zawartości kadmu, cynku i ołowiu oraz benzo(a)pirenu w glebach użytkowanych rolniczo – dwadzieścia lat monitoringu chemizmu gleb ornych Polski(Instytut Uprawy Nawożenia i Gleboznawstwa Państwowy Instytut Badawczy, 2018) Smreczak, Bożena; Siebielec, Grzegorz; Ukalska-Jaruga, Aleksandra; Klimkowicz-Pawlas, AgnieszkaItem Ocena zmian zawartości węgla organicznego w glebach na podstawie danych monitoringu chemizmu gleb ornych w Polsce(Instytut Uprawy Nawożenia i Gleboznawstwa Państwowy Instytut Badawczy, 2015) Faber, Antoni; Jarosz, Zuzanna; Łopatka, Artur; Siebielec, GrzegorzItem Phosphate solubilizing microorganisms role in agriculture and remediation(Instytut Uprawy Nawożenia i Gleboznawstwa – Państwowy Instytut Badawczy w Puławach, 2021) Siebielec, Sylwia; Kozieł, Monika; Woźniak, Małgorzata; Siebielec, GrzegorzItem Phytoextraction of Rare Earth Elements(Instytut Uprawy Nawożenia i Gleboznawstwa – Państwowy Instytut Badawczy w Puławach) Gmur, Dominika; Siebielec, GrzegorzItem Potential of using digestate to regenerate soil and stimulate its biological life(Instytut Uprawy Nawożenia i Gleboznawstwa – Państwowy Instytut Badawczy w Puławach, 2023) Siebielec, Sylwia; Siebielec, Grzegorz; Woźniak, MałgorzataItem Przyrodnicze uwarunkowania produkcji rolniczej w Polsce(Instytut Uprawy Nawożenia i Gleboznawstwa Państwowy Instytut Badawczy, 2007) Stuczyński, Tomasz; Kozyra, Jerzy; Łopatka, Artur; Siebielec, Grzegorz; Jadczyszyn, Jan; Doroszewski, Andrzej; Wawer, Rafał; Nowocień, Eugeniusz