Soil enzyme activities in waste biochar amended multi-metal contaminated soil; Effect of different pyrolysis temperatures and application rates

Meththika Vithanage, Tharanga Bandara, Mohammad I. Al-Wabel, Adel Abduljabbar, Adel R.A. Usman, Mahtab Ahmad, Yong Sik Ok

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

27 Citationer (Scopus)

Resumé

Woody biochars derived by pyrolyzing Gliricidia sepium at 300°C and 500°C and a waste byproduct of same biomass from a bioenergy industry (BC700) were tested for their effect on soil enzymes activities and available form of heavy metals in multi-metals contaminated soil. Pot experiments were conducted during 6 weeks with tomato (Lycopersicon esculentum L.) at biochar application rates, 1, 2.5, and 5% (w/w). A reduction in polyphenol oxidase with biochars produced at increasing pyrolysis temperature compared to the control whereas the maximum activity of dehydrogenase and catalase was observed in 1% BC500 and 2.5% BC300, respectively. Soil available form of Ni, Mn, and Cr were reduced by 55, 70% and 80% in 5% BC700 amended soil, respectively. The highest geometric mean of enzyme activities was observed in 2.5% BC300 treatment. Overall the application of high dosages of high temperature derived biochar masks/deteriorates soil enzyme activities but immobilizes bioavailable heavy metals and reduces toxicity.

OriginalsprogEngelsk
Sider (fra-til)635-643
Antal sider9
TidsskriftCommunications in Soil Science and Plant Analysis
Vol/bind49
Udgave nummer5
DOI
StatusUdgivet - 9 mar. 2018
Udgivet eksterntJa

Programområde

  • Programområde 2: Vandressourcer

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