Nutrient changes in potting mix and Eucalyptus nitens leaf tissue under macadamia biochar amendments  

作　　者：A.Wrobel-Tobiszewska M.Boersma J.Sargison P.Adams B.Singh S.Franks C.J.Birch D.C.Close 

机构地区：[1]CREPS,Centre for Renewable Energy and Power Systems,School of Engineering and ICT,University of Tasmania,Engineering Building,Dobson Road,Sandy Bay Campus,Hobart,Australia [2]Tasmanian Institute of Agriculture,University of Tasmania,16-20 Mooreville Road,PO Box 3523,Burnie 7320,Australia [3]JSA Consulting Engineers Pty Ltd,Ellerslie House,Level 1,119 Sandy Bay Road,Sandy Bay,TAS 7005,Australia [4]Forestry Tasmania,79 Melville Street,Hobart,TAS 7000,Australia [5]Faculty of Agriculture and Environment,Center for Carbon,Water and Food,Biomedical Building,University of Sydney,Camperdown,NSW 2006,Australia

出　　处：《Journal of Forestry Research》2018年第2期379-389,共11页林业研究（英文版）

基　　金：Forestry Tasmaniap,BHP Billiton TEMCO Community Foundation;Tasmanian Community Fund;Centre for Renewable Energy and Power Systems(CREPS);Rainbow Bee Eater Project for their support

摘　　要：The effect of macadamia nut shell biochar on nitrogen,potassium,phosphorus,magnesium,calcium and sodium concentrations in potting mix used to grow Eucalyptus nitens seedlings was investigated in a glasshouse experiment.The treatments combined two fertiliser rates（50 and 100% rate of the commercial mix commonly used in forestry nurseries） with eight biochar rates(0,2,5,10,20,50,80 and 100 t ha;) arranged in a randomised complete block with three replicates of four sample plants.Nutrients were quantified in the potting mix and seedling leaves at four destructive harvests 135,177,219 and269 days after planting.Biochar significantly increased nitrate-N,Colwell P,Colwell K and exchangeable Na andreduced ammonium-N,Mg and Ca concentrations in the potting mix.Seedling leaf concentrations of P,K and Na were increased by biochar application,while N remained dependent on fertiliser rate only.Mg and Ca leaf concentrations decreased in response to increasing biochar rates.Elevated nitrate-N and decreased ammonium-N concentrations suggest that biochar might have increased nitrification in the potting mix.We presumed that biochar mediated processes that reduced uptake of P and K when high doses of biochar were combined with full fertilisation.Changes in potting mix K,Na,Mg and Ca were consistent with selective adsorption of ions to biochar surfaces.The effect of macadamia nut shell biochar on nitrogen,potassium,phosphorus,magnesium,calcium and sodium concentrations in potting mix used to grow Eucalyptus nitens seedlings was investigated in a glasshouse experiment.The treatments combined two fertiliser rates(50 and 100% rate of the commercial mix commonly used in forestry nurseries) with eight biochar rates(0,2,5,10,20,50,80 and 100 t ha^(-1)) arranged in a randomised complete block with three replicates of four sample plants.Nutrients were quantified in the potting mix and seedling leaves at four destructive harvests 135,177,219 and269 days after planting.Biochar significantly increased nitrate-N,Colwell P,Colwell K and exchangeable Na andreduced ammonium-N,Mg and Ca concentrations in the potting mix.Seedling leaf concentrations of P,K and Na were increased by biochar application,while N remained dependent on fertiliser rate only.Mg and Ca leaf concentrations decreased in response to increasing biochar rates.Elevated nitrate-N and decreased ammonium-N concentrations suggest that biochar might have increased nitrification in the potting mix.We presumed that biochar mediated processes that reduced uptake of P and K when high doses of biochar were combined with full fertilisation.Changes in potting mix K,Na,Mg and Ca were consistent with selective adsorption of ions to biochar surfaces.

关 键 词：Charcoal Forest plantation Plant nutrition SEEDLINGS Soil chemistry 

分 类 号：S7[农业科学—林学]