Spatial variability and dynamics of soil pH, soil organic carbon and matter content: The case of the Wonji Shoa sugarcane plantation

• Autorzy: Dinka Megersa Olumana , Dawit Meseret

Identyfikatory

DOI

10.2478/jwld-2019-0045

Warianty tytułu

PL

Przestrzenne zróżnicowanie i dynamika pH gleby oraz zawartości węgla organicznego i materii organicznej: Przykład plantacji trzciny cukrowej Wonji Shoa

• Języki publikacji: EN

Abstrakty

EN

This study presents the spatial variability and dynamics of soil organic carbon (SOC), soil organic matter (SOM) and soil pH contents at the Wonji Shoa Sugar Estate (WSSE), Ethiopia. Soil samples were collected immediately after the sugarcane was harvested and then analysed for SOC, SOM and pH content using standard procedures. The analysis results showed that the pH value varied between 6.7–8.4 (neutral to moderately alkaline) and 7.3–8.5 (neutral to strongly alkaline) for the top and bottom soil profiles, respectively. The SOM content is in the range of 1.1–6.7% and 0.74–3.3% for the upper and lower soil layers, respectively. Nearly 45% of the samples demonstrated a SOM content below the desirable threshold (<2.1%) in the bottom layer and, hence, inadequate. Moreover, most of the topsoil layer (95%) has an SOM content exceeding the desirable limit and hence is categorized within the normal range. Interestingly, the SOC content showed a spatial variability in both the surface and sub-surface soil layers. A lower SOC and SOM content was found for the sub-soil in the south and southwestern part of the plantation. A further decline in the SOC and SOM content may face the estate if the current waterlogging condition continues in the future for a long period. Overall, the study result emphasizes the need to minimize the pre-harvest burning of sugarcane and action is needed to change the irrigation method to green harvesting to facilitate the SOC retention in the soil and minimize the greenhouse emission effect on the environment, hence improving soil quality in the long-term.

PL

W pracy przedstawiono przestrzenną zmienność i dynamikę węgla organicznego w glebie (SOC), materii organicznej (SOM) i pH na plantacji Wonji Shoa Sugar Estate (WSSE) w Etiopii. Próbki gleby były pobierane bezpośrednio po zbiorze trzciny cukrowej. Analizowano w nich wymienione wyżej składniki według standardowych procedur. Wartość pH zmieniała się od 6,7 do 8,4 w powierzchniowej warstwie gleby i od 7,3 do 8,5 w głębi profilu glebowego. Zawartość materii organicznej wynosiła od 1,1 do 6,7% w górnej i od 0,74 do 3,3% w dolnej warstwie gleby. Około 45% próbek zawierało materię organiczną w ilościach mniejszych niż pożądana (2,1%) w głębszych warstwach gleby. Większość próbek powierzchniowych zawierała materię organiczną w ilościach przekraczających tę granicę, co klasyfikuje te gleby jako normalne. Co ciekawe, zawartość węgla organicznego cechowała zmienność przestrzenna zarówno w powierzchniowych, jak i podpowierzchniowych warstwach gleby. Mniejszą zawartość materii organicznej i węgla organicznego stwierdzono w podpowierzchniowych warstwach gleby z południowej i południowozachodniej części plantacji. Gleby na plantacji mogą doświadczać dalszego spadku zawartości SOC i SOM, jeśli obecne wysycenie gleby wodą będzie występowało w przyszłości. Podsumowując, wyniki badań wskazują na potrzebę minimalizowania opalania trzciny cukrowej przed zbiorem oraz podejmowania działań zmierzających do zmiany metod nawadniania, aby usprawnić retencję węgla organicznego w glebie i łagodzić środowiskowe skutki emisji gazów cieplarnianych, a przez to polepszyć jakość gleb w dłuższej perspektywie czasowej.

Słowa kluczowe

EN

organic matter content; pH; soil organic carbon; soil quality; sugarcane

PL

jakość gleb; pH; trzcina cukrowa; węgiel organiczny w glebie; zawartość materii organicznej

• Wydawca: Wydawnictwo ITP
• Czasopismo: Journal of Water and Land Development
• Rocznik: 2019
• Tom: no. 42
• Strony: 59--66
• Opis fizyczny: Bibliogr. 49 poz., rys., tab.

Twórcy

autor

Dinka Megersa Olumana

• University of Johannesburg, Faculty of Engineering and the Built Environment, Department of Civil Engineering Sciences, APK Campus, P.O. Box 524, Auckland Park 2006, Johannesburg, South Africa

autor

Dawit Meseret

• Haramaya University, Department of Hydraulic and Water Resource Engineering, Institute of Technology, Dire Dawa, Ethiopia, University of Johannesburg, Faculty of Engineering and the Built Environment, Department of Civil Engineering Sciences, Johannesburg, South Africa

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).