17 results on '"Soil moisture"'
Search Results
2. Meteorologinių sąlygų poveikio dirvožemio drėgmei vertinimas
- Author
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Mačiulytė, Viktorija and Rimkus, Egidijus
- Subjects
soil moisture ,drought ,waterlogging ,crop productivity ,climate change - Abstract
The current study employs the Soil-Water-Atmosphere-Plant (SWAP) model to simulate soil moisture and evaluate the influence of extreme meteorological conditions on soil in six locations in Lithuania. Soil moisture is an important component of the environment, and when measurements are unavailable, the most reliable method of evaluation is modelling. The results of the study revealed that the model output data closely matched the results of the soil moisture measurements, so the model may be useful for evaluating climate change impact and predicting the effects of extreme conditions on soils. The results also showed that satellite-based soil moisture products cannot replace in situ measurements, which is why modelling is the better alternative. Between 1951 and 2020, soil moisture decreased each month at the beginning of the vegetation season except for July. These changes corresponded partly to changes and redistribution of precipitation during the warm season. Current climate predictions do not reveal clear trends in average soil moisture level, though it is expected that both extremely wet and dry conditions will become more prevalent. The present study demonstrates that modelled soil moisture can be used to identify extremely dry and wet soil conditions, though these may not always correspond to droughts and long rainy periods. Evaluating extreme conditions using soil moisture measurements may provide additional information on the impact of the weather on soils and crops.
- Published
- 2023
3. Research and assessment of forest soil properties in South-Eastern Lithuania / Pietryčių Lietuvos miško dirvožemio savybių tyrimai ir vertinimas
- Author
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Dovilė Vaitkutė and Pranas Baltrėnas
- Subjects
forest ,soil pH ,total organic carbon matter ,soil moisture ,Technology ,Science - Abstract
Along with chemical research on the Scots pine (Pinus sylvestris L.) growing in the South – Eastern part of Lithuania, the analysis of soil properties was given close attention. The analysed forest soil samples were collected in the spring and summer seasons of 2011. Before sampling, a grid of the area covering 10×10 km including all biggest forest areas of the territory was made. In total, 42 composite forest soil samples were examined. The conducted analysis measured soil moisture, pH and the content of total organic carbon. The assessment of these parameters and performed statistical analysis has disclosed that the content of total organic carbon positively and significantly correlates with pH and the content of soil moisture. Additionally, it has been determined that the content of total organic carbon tends to increase when pH of soil is close to neutral and a total value of soil moisture does not reach 0,61%. Santrauka Tiriant Pietryčių Lietuvos paprastosiose pušyse (Pinus sylvestris L.) susikaupusių metalų kiekius, daug dėmesio buvo skiriama dirvožemio savybių analizei. Straipsnyje aptariami miško dirvožemio ėminiai, imti 2011 m. pavasarį ir vasarą. Prieš atliekant lauko tyrimus buvo sudarytas 10 ×10 km dydžio ėminių ėmimo tinklelis, apimantis didžiausius Pietryčių Lietuvos miškų masyvus. Iš viso ištirti 42 sudėtiniai miško dirvožemio ėminiai. Buvo nustatomas dirvožemio drėgnis, pH ir bendrosios organinės anglies kiekis. Įvertinus šiuos parametrus ir atlikus statistinę analizę nustatyta, kad dirvožemio bendrosios organinės anglies kiekis priklauso nuo dirvožemio pH ir drėgnio. Taip pat įvertinus organinės anglies kiekio priklausomybę nuo abiejų minėtųjų parametrų, pastebėta tendencija, kad bendrosios organinės anglies kiekis gali siekti net 30–50 mg/kg (vidutinė koncentracija Pietryčių Lietuvoje yra 6–10 mg/kg), dirvožemio pH vertė – 6–8, o dirvožemio drėgnis mažesnis nei 0,6 %. Raktiniai žodžiai: miškas; dirvožemio pH; bendroji organinė anglis; dirvožemio drėgnis
- Published
- 2011
- Full Text
- View/download PDF
4. RADONO PERNAŠOS IŠ DIRVOŽEMIO Į PATALPAS MATAVIMO IR MODELIAVIMO REZULTATAI.
- Author
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Streckytė, Erika and Butkus, Donatas
- Subjects
- *
RADON , *HUMIDITY , *TEMPERATURE , *TRANSPORTATION , *SOIL moisture - Abstract
The article presents the entry of radon gas into premises and introduces the parameters accelerating and slowing this process. The paper determines the dependence of radon gas entering the premises on ambient temperature and humidity changes. It is noted that a growth in differences under ambient and indoor temperature increases indoor radon concentrations in the air due to an increase in the intensity of radon exhalation from soil. Also, an increase in the moisture content indoors decreases the volumetric activity of radon in the air. The simulated values of radon volumetric activity in ambient air were similar to those measured using radon monitoring device RTM2200. Radon concentration in the air of the first floor was higher than that in the second floor. Indoor radon concentrations were highest in the winter and lowest in summer season. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
5. Ilgalaikio supaprastinto žemės dirbimo ir tiesioginės sėjos įtaka žieminių kviečių pasėliui.
- Author
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Juchnevičienė, Aistė, Raudonius, Steponas, Avižienytė, Dovilė, Romaneckas, Kęstutis, and Bogužas, Vaclovas
- Subjects
WINTER wheat ,TILLAGE ,SOWING ,EXPERIMENTAL agriculture ,SHEAR strength of soils ,EARTHWORMS ,SOIL moisture - Abstract
Copyright of Agricultural Sciences / Zemès ukio Mokslai is the property of Lithuanian Academy of Sciences Publishers and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2012
6. HEC-HMS modelių sistemos taikymo Jūros upės šiltojo laikotarpio poplūdžių modeliavimui vertinimas.
- Author
-
Stonevičius, Edvinas and Jonuškaitė, Simona
- Subjects
- *
FLOOD forecasting , *HYDROLOGIC cycle , *SOIL moisture , *SIMULATION methods & models - Abstract
This paper contains an analysis of capability of HECHMS modeling system for simulation and forecast of flash floods in the Jūra River. The set of HEC-HMS system models which requires the minimum input data and is calibrated with smallest number of parameters was used. The study aims to assess whether the existing and readily available hydrological and meteorological data is sufficient to simulate and predict flash floods in the Jūra and similar Lithuanian rivers. The HEC-HMS modeling system was calibrated for nine major flash floods of the Jūra River. The optimal sets of calibration parameters were very different for all floods. One set of parameters which would be acceptable for all flash floods was not found. Therefore, the HEC-HMS modeling system in the analyzed setup and with at present available data can be used to simulate the past flash floods, but is not capable of forecasting. More data about the state of the river basin before the rainfall event is needed for forecasting of flash floods in the Jūra River. It is likely that the availability of data on soil moisture could increase the forecasting potential of HEC-HMS modeling system. [ABSTRACT FROM AUTHOR]
- Published
- 2012
7. PIETRYČIŲ LIETUVOS MIŠKO DIRVOŽEMIO SAVYBIŲ TYRIMAI IR VERTINIMAS.
- Author
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Vaitkutė, Dovilė and Baltrėnas, Pranas
- Subjects
- *
SCOTS pine , *SOIL moisture , *ASTRONOMICAL geography , *SOIL testing - Abstract
Along with chemical research on the Scots pine (Pinus sylvestris L.) growing in the South - Eastern part of Lithuania, the analysis of soil properties was given close attention. The analysed forest soil samples were collected in the spring and summer seasons of 2011. Before sampling, a grid of the area covering 10x 10 km including all biggest forest areas of the territory was made. In total, 42 composite forest soil samples were examined. The conducted analysis measured soil moisture, pH and the content of total organic carbon. The assessment of these parameters and performed statistical analysis has disclosed that the content of total organic carbon positively and significantly correlates with pH and the content of soil moisture. Additionally, it has been determined that the content of total organic carbon tends to increase when pH of soil is close to neutral and a total value of soil moisture does not reach 0,61%. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
8. Profesorius Aloyzas Dirsė -- žymus Lietuvos mokslininkas, pedagogas ir visuomenės veikėjas.
- Author
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KINČIUS, Liudas
- Subjects
EDUCATORS ,ACTIVISTS ,SOIL moisture ,RECLAMATION of land ,IRRIGATION - Published
- 2011
9. Drėgmingumo kaita augalų vegetacijos metu ir jo vertinimo metodų palyginimas.
- Author
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Dirsė, Aloyzas and Taparauskienė, Laima
- Subjects
HUMIDITY ,PLANT physiology ,EVAPOTRANSPIRATION ,SOIL moisture ,DROUGHTS ,CROPS ,VEGETATION & climate - Published
- 2010
10. Thornthwaite-Mather vandens balanso modelio optimizavimas Monte Karlo metodu.
- Author
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Stonevičius, Edvinas
- Subjects
- *
MONTE Carlo method , *MATHEMATICAL models , *MATHEMATICAL optimization , *WATER balance (Hydrology) , *SOIL moisture , *TEMPERATURE , *RAINFALL , *EVAPORATION (Meteorology) - Published
- 2009
11. Dirvožemio drėgmės režimo pokyčių XXI a. prognozės pagal skirtingus klimato kaitos scenarijus.
- Author
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Stonevičius, Edvinas, Štaras, Andrius, and Valiuškevičius, Gintaras
- Subjects
- *
CLIMATE change , *GLOBAL warming , *SOIL moisture , *HYDROLOGY , *AGRICULTURE - Abstract
The global warming may induce intensive changes in soil water regime. In this article, we analyse tendencies of changes in the soil water content in Lithuania for the period from 2001 to 2090. Results of the work are based on the calculations of soil water regime and its change in the 0-1000 mm layer. The analysis was based on the water balance method. To forecast the climate, the general circulation models HadCM3 and Echam5 with appropriates emission scenarios A1B and B1 were employed. To characterize the meteorological situation in Lithuania, we used information of 16 meteorological stations. The hydrological situation was characterized by 18 various catchments. The information was analysed using the Thorntwaite-Mather (TM) and WatBal hydrological models. When in the analysis results of the climate change scenario HadCM3-A1B, were applied using the TM model estimated that soil water in 2001-2090 would decrease. In comparison with 1971-2000, soil water content reduction in May-August in 2001-2030 will total 18%, in 2031-2060 24% and in 2061-2090 31.5%. Very intensive changes were predicted in West Lithuania. The main reason for soil water reduction (according to WatBal model) is increase of evaporation in the 21st century. The soil water forecast by TM hydrological models applying results of the climate scenario Echam5-B1 established a less significant water decrease. The maximum soil water depression was found for 2001-2030 (14-19%) and 2061-2090 (12-16%). The main reason that determined these soil water forecast results is more abundant precipitation in the scenario Echam5-B1. The highest desiccation will occur in the surface layer of soil on a light texture ground (both HadCM3-A1B and Echam5-B1 climate scenarios). [ABSTRACT FROM AUTHOR]
- Published
- 2008
12. Arimo ir beplūgio žemės dirbimo įtaka dirvožemio fizikinėms savybėms ir augalų produktyvumui.
- Author
-
Šimanskaitė, Danutė
- Subjects
TILLAGE ,AGRICULTURE ,CROP yields ,HARVESTING ,SOIL moisture - Abstract
Copyright of Agricultural Sciences / Zemès ukio Mokslai is the property of Lithuanian Academy of Sciences Publishers and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2007
13. Paprastojo kukurūzo (Zea mays L.), auginto skirtingomis drėgmės ir temperatūros sąlygomis, fotosintezės ir biometrinių rodiklių kitimas.
- Author
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Šliogerytė, Kristina, Sakalauskienė, Sandra, Brazaitytė, Aušra, Lazauskas, Sigitas, Sakalauskaitė, Jurga, Sirtautas, Ramūnas, and Duchovskis, Pavelas
- Subjects
- *
PHOTOSYNTHESIS , *BIOMETRY , *CORN , *VEGETATION & climate , *SOIL moisture - Abstract
The main goal of this study was to investigate the effect of temperature and water stress in maize 'Simon' (Zea mays L.). Experiments were carried out at the Lithuanian institute of Horticulture in phytotron complex in 2007. Maize 'Simon' (Zea mays L.) was grown in 5-liter pots under natural greenhouse conditions till VI -VI organogenesis stages. Then plants were transferred to a climate chamber at 4 different temperatures (21/16 °C ir 30/23 °C day/night) and soil moisture regimes where were grown for 10 days effect and later 7 days regeneration period. Water deficiency had negative effect on plant growth. Relative growth rate and photosynthetic productivity were the least in dry substrate at temperature of 30 °C and 21 °C . The highest relative growth and plant height was in substrate of normal moisture and higher temperature. The result shows negative effect of shortage and high temperature on plat vegetation period. [ABSTRACT FROM AUTHOR]
- Published
- 2009
14. Drėkinimo sistemų poreikis Kauno apskrityje
- Author
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Stravinskas, Tadas, Taparauskienė, Laima, Punys, Petras, Pocienė, Alma, and Lithuanian University of Agriculture
- Subjects
Environmental Engineering and Land Management ,Drėkinimo sistemos ,Žemdirbystė ,Plants growing ,Drėgmė ,A demand ,Agriculture ,Augalininkystė ,Irrigation systems ,Soil moisture ,Poreikis - Abstract
Darbe analizuojami Kauno apskrities ūkininkų ūkiai, jų sausinimo ir drėkinimo sistemų poreikis, priklausomybė nuo ūkio veiklos. Analizei panaudoti ūkininkų, užsiimančių žemdirbyste, apklausos duomenys. Aktualiausia problema - išsiaiškinti drėkinimo sistemų poreikį Kauno apskrities žemdirbystės ūkiuose. Siekiant optimaliai padidinti derliaus apimtis, svarbu palaikyti tinkamą drėgmės kiekį dirvožemyje ir visą augalo vegetacijos laikotarpį išlaikyti optimalų dirvožemio drėgnumą. Ypatingai svarbu įvertinti drėkinimo sistemos reikalingumą ūkiui ar įrengta sistema padės padidinti derliaus apimtis. Taip pat aktualu įrengiant drėkinimo sistemas įvertinti ir sausinimo sistemos būklę. Išanalizavus esamą situaciją galima teigti, kad drėkinimo sistemos yra labai svarbios tam tikrų veiklos sričių ūkiams, ypatingai daržininkystei. Šiose veiklose galima žymiai padidinti derliaus apimtis, kokybę, prekinę išvaizdą. The aim of thesis is to analyze farmers’ farms of Kaunas region, the condition of farms’ drainage and irrigation systems, their dependence on the farms’ work. The questioning data of farmers has been used for the analyse. The most relevant problem is to ascertain the demand of irrigation systems for agriculture of Kaunas region. In order to increase extents of harvest it is important to maintain optimal soil moisture regime during all period of plants’ vegetation. It is particularly essential to evaluate the need of irrigation system to a farm or if equipped systems will help to increase extents of harvest. As well as it is relevant while equipping irrigation systems to evaluate conditions of drainage system. According to the accomplished research about analyzed situation, it might be proposed that irrigation systems are very essential to certain work field farms, especially to vegetable-growing, seed-growing. Extent, quality and marketable looks of harvest might be considerably increased in these activities.
- Published
- 2009
15. Воздействие вертикального распределения соломы в почвенном слое на ее свойства
- Author
-
Germanas, Laimutis
- Subjects
Straw as fertilizer ,Soil management ,Dirvožemiai--Drėgmė ,Dirvos dirbimas ,Soil moisture ,Šiaudai (trąša) - Abstract
Šiuolaikinėje žemdirbystėje vis dažniau naudojamos organinės trąšos. Tai gali būti šiaudai, tarpiniai augalai ar mėšlas. Šiuo metu populiarėjant tausojamosios žemdirbystės technologijoms didelis dėmesys skiriamas šalutinei augalų produkcijai – šiaudų smulkinimui ir paskleidimui dirvoje. Dirvos padengimas šiaudais mažina erozijos, mineralinių trąšų ir pesticidų išplovimo iš dirvožemio procesus, gerina dirvos agrofizikines savybes, struktūrą. Siekiant įvertinti šiaudų padėties dirvoje įtaką dirvos kiečiui, drėgmei, paviršiaus padengimui šiaudais atlikti eksperimentiniai tyrimai dirvoje, kurioje augo miežiai. Po derliaus nuėmimo likę šiaudai įterpti į dirvą ariant, ražieniniu skutiku plokščiapjoviais noragėliais, sėjamosios darbinėmis dalimis arba po sėjos paskleisti dirvos paviršiuje. Sėti žieminiai kviečiai. Nustatyta, kad miežių šiaudus susmulkinus ir paskleidus dirvos paviršiuje, vidutinis dirvos padengimas šiaudais 79,6±6,9 %, o supurenus ražieniniu skutiku plokščiapjoviais noragėliais – 51,6±5,6 %, dirvą suarus – tik 2,2 %. Pavasarį dirvos padengimo šiaudais skirtumai tarp variantų sumažėjo. Prieš sėją dirva kiečiausia nedirbtoje ražienoje. Vegetacijos pabaigoje, paviršiniame dirvos sluoksnyje, dirvos kietis mažesnis variantuose, kur įterpti į dirvą šiaudai. Šiaudus paskleidus po sėjos dirvos paviršiuje, dirva yra kietesnė. Po sėjos dirvos paviršiuje paskleisti šiaudai, lyginant su įterptais dirvos sluoksnyje, rudenį didino dirvos drėgnį vidutiniškai 5,7 %, (LSD(05)=... [toliau žr. visą tekstą] In the modern agriculture usage of organic manure are expanding. It can be straw, intermediate plants or dung. At present, when the technologies of sparing agriculture are spreading quickly, great attention is paid for secondary production of products – chopping and spreading of straw in soil. Covering soil with straw reduces the process of erosion, elution of mineral manures and pesticides from soil, improves agro-physical features and structure of soil. In order to evaluate the influence of straw position in soil towards hardness of soil, humidity and covering the surface of straw, experimental researches in the soil, where barleys were growing, were performed. After getting the harvest, remaining straw were inserted into soil while ploughing using stubbly scraper with flag-cut ploughshares, sowing by working parts or after sowing were spread on the surface of soil. It was estimated that after chopping and spreading straw of barleys on the surface of soil, average covering of soil with straw was 79.6±6.9 %, and after loosing the soil using stubbly scraper with flag-cut ploughshares – 51.6±5.6 %, after ploughing soil – only 2.2 %. Soil covering differences in spring reduced. Before sowing the biggest hardness was in non-cultivated stubble. At the beginning of vegetation in the superficial layer of soil hardness of soil is lower in the variants inserted into soil with straw. Spreading straw on the surface of soil after sowing, the hardness of soil is bigger. Spread... [to full text] В соывременном земледелии все шире используется органические удобрения. Это может быть солома, промежуточные культуры или навоз. В настоящее время расширяются почвозащитные технологии обработки почвы и первостепенное внимание уделяется заделыванию соломы в почву. Покрытие почвы соломой уменьшает эрозию, вынос минеральных удобрений и пестицидов из почвы, улучшает агрофизические свойства почвы и структуру. С целью обоснования влияния распределения соломы в почвенном слое на твердость, влажность, покрытию поверхности почвы, проведены экспериментальные исследования. Солома заделывана в почву при вспашке, стерневым лущильником плоскорезными сошниками, рабочими органами сеялки или после сева раструсена на поверхности почвы. Определено, что измельченная и раструсена на поверхности почвы солома ячменя покрывает почву 79,6±6,9 %, после рыхления стерневым лущильником – 51,6±5,6 %, а после вспашки только 2,2 %. Весной разница покрытия почвы соломой между вариантами уменьшилась. Перед севом наименьшая твердость необработанной стернп. В конце вегетации на поверхностном слое твердость меньшая при заделывании соломы в почву. При раструсении соломы после сева на поверхность почвы, твердость почвы большая. На поверхности почвы раструсенная солома, по сравнению с заделанной в почвенный слой осенью, увеличивала влажность почвы в среднем на 5,7 % (LSD(05)=3,6 %). Проведенные исследования а��солютной, объемной влажности и плотности почвы показали сильную кореляционную связь между ними (R2=... [полный текст, см. далее]
- Published
- 2007
16. Drėkinimo įtaka 'Senga Sengana' braškėms
- Author
-
Taparauskienė, Laima
- Subjects
Drėkinimas ,Dirvožemiai--Drėgmė ,Strawberries--Crop yields ,Strawberries ,Braškės--Derlingumas ,Soil moisture ,Irrigation ,Braškės (uogos) - Abstract
2001–2004 m. Kauno rajone buvo atlikti eksperimentiniai drėkinimo režimo tyrimai. Tirta drėkinimo įtaka ‘Senga Sengana’ veislės braškių ūkiniams ir biologiniams rodikliams. Nustatyta, kad drėkinimas turėjo didelės įtakos suminio derliaus priedui, vidutinei uogos masei, dauginimosi rodikliams bei lapo asimiliacinio paviršiaus plotui, todėl Lietuvos klimato sąlygomis braškes drėkinti yra tikslinga. 2001–2004 m. vidutinis derlius nedrėkinant buvo 7,8 t/ha, o drėkinant – 8 t/ha (70–100% LDI) ir 10,8 t/ha (80–100% LDI). Vidutinė vienos uogos masė nedrėkinant buvo 7,3 g, palaikant dirvožemio drėgmę nuo 70 iki 100% LDI– – 7,9 g, o nuo 80 iki 100% LDI – 8,2 g. Optimalios dirvožemio drėgmės sąlygomis (80–100% LDI) vieno braškių kero užaugintų skrotelių skaičius buvo 2,5 karto didesnis nei nedrėkinant. The investigations were carried out in the Middle Lithuania (Kaunas region) during 2001–2004. In the territory of investigations the soil was calcareus deeper gleyic leached soil, IDg4-k, (sod podzolic JPlv), mechanical composition – light loam on clay loam. Experimental investigations were focused on ‘Senga Sengana’ strawberry cultivar. The aim of the work was to determine the influence of irrigation on strawberry yield and others indicators. Irrigation effect on yield and other strawberry indicators have been analyzed and it was determined, that irrigation has a significant influence on the increase of total yield, fruit size, runner production and leaf assimilation area. The differences between irrigated and non-irrigated versions are essential and statistically significant (p – 0.05). In 2001–2004 average yield of non-irrigated strawberry was 7.8 t/ha and this one of irrigated – 8 t/ha (the first treatment 70–100% field capacity (FC)) and 10.8 t/ha (the second treatment 80–100% FC). Maintaining soil moisture conditions within the limits of 80–100% FC the increase of strawberry yield in comparison with non-irrigated was biggest – 3 t/ha (or 137.7% of non irrigated treatment). Under natural soil moisture conditions average weight of single berry in the treatment without irrigation was 7.1 g, and with irrigation (80–100% FC) – 8.2 g. The difference between the average weight of single berry in control and in the first treatment was 0.6 g and between control and the second... [to full text]
- Published
- 2006
17. GRUNTINIO VANDENS LYGIO DINAMIKOS TARPDRENYJE TYRIMAI IR MODELIAVIMAS.
- Author
-
Vaičiukynas, Vilimantas
- Subjects
GROUNDWATER ,WATER table ,SOIL permeability ,HYDRAULICS ,SOIL structure ,SOIL moisture - Published
- 2014
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