Use this url to cite publication: https://hdl.handle.net/20.500.12259/78771
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Fluctuations in the Concentrations of Main Cations Contained in Drainage Runoff when Trench Backfill is Mixed with Lime Additives
Type of publication
Straipsnis kitoje duomenų bazėje / Article in other database (S4)
Author(s)
Šaulys, Valentinas | Lietuvos žemės ūkio universiteto Vandens ūkio institutas | LT |
Bastienė, Nijolė | Lietuvos žemės ūkio universiteto Vandens ūkio institutas | LT |
LT |
Title
Fluctuations in the Concentrations of Main Cations Contained in Drainage Runoff when Trench Backfill is Mixed with Lime Additives
Other Title
Pagrindinių katijonų koncentracijų kaita drenažo nuotėkyje dėl kalkinių medžiagų įterpimo į tranšėjų užpilą
Is part of
Aplinkos tyrimai, inžinerija ir vadyba. Kaunas : Technologija., 2005, Nr. 4(34)
Date Issued
Date Issued |
---|
2005 |
Publisher
Kaunas : Technologija
Is Referenced by
Extent
p. 51-60
Field of Science
Abstract
Due to different biological processes occurring in the soil, in drainage water of Kalnujai study object (in variants I-III) maximum concentration of Mg cations was 47.5, 30 and 22.5% higher than MAC respectively in certain periods of investigations (particularly in summer), which lead to the conclusion that drainage water was contaminated with Mg cations. From this point of view, water in Silupe river corresponded to the requirements as here maximum Mg concentration was 39 mg l-1 and thus did not exceed MAC. Concentrations of other studied cations did not exceed MAC either.
Straipsnyje nagrinėjami pagrindinių katijonų (kalcio, magnio, kalio ir natrio) koncentracijų skirtumai ir nuotėkis drenažo sistemose, kai sausinant priemolio dirvožemius į drenažo tranšėjų užpilą įterpiama 0,6 % aktyvaus CaO sauso grunto masei. Tyrimai atlikti Kalnujų bandymų objekte 1999–2003 m. trimis variantais: I ir II variantuose drenažo tranšėjų užpilas maišytas su kalkine medžiaga (skalūnų pelenais), atstumai tarp drenų – atitinkamai 16 ir 24 m ( t. y. II variante padidinti 1,5 karto). III variante (kontroliniame) tranšėjos užpiltos vietiniu gruntu, drenavimo atstumai – 16 m. Kalnujų bandymų objekto drenažo vandenyje (I–III var.) dėl dirvožemyje vykstančių biologinių procesų kai kuriais stebėjimo laikotarpio momentais (ypač vasarą) didžiausia magnio katijonų koncentracija buvo atitinkamai 47,5, 30 ir 22,5 % didesnė už DLK, todėl galima teigti, kad drenažo vanduo buvo užterštas magnio katijonais. Šilupės up. vanduo šiuo požiūriu atitiko kokybės reikalavimus, nes didžiausia magnio koncentracija (39 mg l-1) buvo mažesnė už DLK. Kitų stebėtų katijonų koncentracijos buvo leidžiamų dydžių.
The paper analyses the differences between concentrations of the main cations (calcium, magnesium, potassium, and natrium) and estimates the runoff in drainage systems when 0.6% of active CaO for dry soil mass was mixed in trench backfill during the draining process of sandy loam soils. The studies were performed in Kalnujai study object in 1999-2003. The study object contains three treatments of trials: drainage trench backfill was mixed with lime additives (shale ashes) in variants I and II; the spacing of drains was 16 m in variant I; drain spacing was increased 1.5 times up to 24 m in variant II; local soil was used as trench backfill and drain spacing was 16 m in variant III. Calcium (Ca+2) and magnesium (Mg+2) cations are prevailing in the chemical composition of drainage water. The share of their concentration in the sum of main ions reaches 62 % and 26% respectively. In wet 2001 seasonal fluctuations in calcium cations were determined (R2 = 0.85-0.96): minimal values of Ca cation concentrations were obtained in January-February, maximum values were observed in August-September. Ca and Mg cations make up approximately 88% of total cations runoff. During the study period of 1999-2003, leached amount of cations in systems with lime additives mixed into the trench backfill was 860 kg ha-1, in the control variant leaching of the cations was 6.5% less intensive and reached 805.0 kg ha-1. The average potassium cation concentrations contained in drainage systems of variants I and II were 1.71 times lower than those in control drains; the runoff of potassium cations within the study period was 5.6 and 5.9 kg ha-1 or 1.9 times less intensive compared to the drainage systems of the control variant (10.41 kg ha-1). Equations of the dependence of main cations runoff on the drainage runoff height show a close relation of those variables in the period of 1999-2003.
Type of document
type::text::journal::journal article::research article
Language
Anglų / English (en)
Coverage Spatial
Lietuva / Lithuania (LT)