Soil Microbial Responses to Biochars Varying in Particle Size,Surface and Pore Properties

作     者：Noraini M.JAAFAR Peta L.CLODE Lynette K.ABBOTT 

作者机构：Soil Biology and Molecular Ecology GroupSchool of Earth and Environment (M087) and UWA Institute of AgricultureThe University of Western Australia Department of Land ManagementFaculty of AgricultureUniversiti Putra Malaysia Centre for MicroscopyCharacterisation and Analysis (M010)The University of Western Australia 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2015年第25卷第5期

页      面：770-780页

核心收录：

学科分类：07[理学] 0713[理学-生态学] 

基　　金：Universiti Putra Malaysia Government of Malaysia University of Western Australia University, State and Commonwealth Governments, Australia 

主　　题：microbial biomass, microbial colonisation, microbial habitats, porosity scanning electron microscopy, surface structure 

摘      要：Biochars are known for their heterogeneity, especially in pore and surface structure associated with pyrolysis processes and sources of feedstocks. The surface area of biochar is likely to be an important determinant of the extent of soil microbial attachment, whereas the porous structure of biochar is expected to provide protection for soil microorganisms. Potential interactions between biochars from different sources and with different particle sizes were investigated in relation to soil microbial properties in a short-term incubation study. Three particle size （sieved） fractions （0.5-1.0, 1.0-2.0 and 2.0-4.0 mm） from three woody biochars produced from jarrah wood, jarrah and wandoo wood and Australian wattle branches, respectively, were incubated in soil at 25 ℃ for 56 d. Observation by scanning electron microscopy （SEM） and characterisation of pore and surface area showed that all three woody biochars provided potential habitats for soil microorganisms due to their high porosity and surface areas. The biochars were structurally heterogeneous, varying in porosity and surface structure both within and between the biochar sources. After the 56-d incubation, hyphal colonisation was observed on biochar surfaces and in larger biochar pores. Soil clumping occurred on biochar particles, cementing and covering exposed biochar pores. This may have altered surface area and pore availability for microbial colonisation. Transient changes in soil microbial biomass, without a consistent trend, were observed among biochars during the 56-d incubation.