Potential of biochar and organic amendments for reclamation of coastal acidic-salt affected soil  

作　　者：Viraj Gunarathne Athula Senadeera Udaya Gunarathne Jayanta Kumar Biswas Yaser A.Almaroai Meththika Vithanage 

机构地区：[1]Ecosphere Resilience Research Centre,Faculty of Applied Sciences,University of Sri Jayewardenepura,Nugegoda,Sri Lanka [2]Enviromicrobiology,Ecotoxicology and Ecotechnology Research Unit,Department of Ecological Studies and International Centre for Ecological Engineering,University of Kalyani,Kalyani,Nadia 741235,West Bengal,India [3]Department of Biology,Faculty of Applied Science,Umm Al-Qura University,Makkah,Saudi Arabia [4]Molecular Microbiology and Human Diseases,National Institute of Fundamental Studies,Kandy,Sri Lanka

出　　处：《Biochar》2020年第1期107-120,共14页生物炭（英文）

摘　　要：Salinity and acidity have affected several hundred million hectares of land throughout the globe which poses a major threat to global food security and biodiversity.Application of organic amendments for salt-affected soils has been identified as one of the most effective ways to mitigate salinity-induced problems and considered as a green technique offering twin benefits of waste load reduction and land reclamation.However,studies on reclaiming acidic-salt affected soils are limited.Therefore,this study aimed to determine the reclamation potential of biochars and organic amendments involving Gliricidia sepium biochar produced at 300℃,500℃,and 700℃,green waste compost,and municipal sewage sludge at three different amend-ment ratios,1.0%,2.5%and 5.0%.The incubation experiment was conducted for a 4-month period with different amendment ratios applied to the coastal acidic-salt affected soil.Subsamples were extracted from incubation pots after 1 and 4 months and analyzed for soil chemical parameters(pH,EC,NO_(3)^(−),PO_(4)^(3−,total organic carbon,cation exchange capacity,sodium adsorption ratio,exchangeable sodium percentage)and microbial enzyme activity(catalase activity,and acid-and alkaline phosphatase activity).All organic amendments demonstrated enhancement of the soil properties in a significant manner.However,increasing incubation time and amendment ratio increase the changes of soil parameters by a great percentage.Therefore,the maximum amendment ratio of 5.0%and 4 months of incubation period rendered a significant improvement in the reclamation of acidic-salt affected soil.However,the biochar produced at 500℃ contributed the maximum towards the improved physicochemical and biochemical profile of acidic-salt affected soil,making it the most promising organic amend-ment for the reclamation of acidic-salt affected soil.The overall reclamation efficiency of organic amendments registered the following order of variation:700 BC<Sludge<300 BC<Compost<500 BC.

关 键 词：SALINITY Soil acidity COMPOST BIOSOLIDS Soil amendment 

分 类 号：S15[农业科学—土壤学]