Biochar pyrolyzed at low temperature enhanced acidophilous plant growth by promoting rhizospheric microbes in a slightly alkaline urban soil

查看全文 作　　者：Huimin [1]Zhou;Xiaoying [1,2]Li;Chang [1]Li;Lisi [1]He;Xiaoqing [1]Liu;Zheng [1]Xiao;Xiaobo [1]Sun;Gaoling [1]Shi;Jiale [1]Su;Junhui [3]Chen

机构地区：[1]Jiangsu Key Laboratory for Horticultural Crop Genetic Improvement,Institute of Leisure Agriculture,Jiangsu Academy of Agricultural Sciences,Nanjing 210014,China;[2]College of Horticulture and Plant Protection,Yangzhou University,Yangzhou 225009,Jiangsu,China;[3]State Key Laboratory of Subtropical Silviculture,Zhejiang A and F University,Lin’an,Hangzhou 311300,China

出　　处：《Biochar》索引2021年第3卷第4期,共12页

基　　金：The research was supported by the National Natural Science Foundation of China(41807100 and 41977083);Jiangsu Agricultural Science and Technology Innovation Fund(CX(19)3047);Jiangsu Provincial Forestry Development Special Fund[SuCaizihuan(2020)No.26]. 摘　　要：Biochar has been considered as a potential way to enhance acidophilous plant growth in alkaline soils.However,whether such enhancements are closely linked with biochar pyrolysis temperature and its improvements in rhizospheric soil fertility and microbial activities remains largely unknown.We performed a pot experiment to investigate changes in azalea(Rhodo-dendron)morphology and physiology,as well as its rhizosphere soil chemical and biological properties in a slightly alkaline urban soil under the amendment of biochars that pyrolyzed at three temperatures(i.e.,350,550 and 700°C).Our results showed that the effects of biochars on plant growth and soil properties depended on pyrolysis temperature.In comparison with the non-amended control,350 and 550°C biochars showed significant promotions on the azalea growth in terms of photosynthetic characteristics,biomass,root morphology,and N and P uptake.Whereas,700°C biochar showed an inhibi-tion effect on them.350°C biochar decreased soil pH and increased soil available P and K contents and the activities ofα-glucosidase,N-β-glucosaminidase,phosphatase and sulfatase.In addition,350°C biochar significantly enhanced bacterial 16S rRNA and fungal 18S rRNA gene abundances in the rhizosphere soil of azalea and mycorrhizal infection.Correlation analysis indicated that soil pH,available nutrients and fungal abundance had positive associations with the enhanced plant growth parameters.Therefore,our findings suggest that biochar produced at low temperature could be a feasible strategy for enhancing acidophilous azalea growth and improving urban soil quality. 关键词：Pyrolysis temperature Soil microbial abundance Rhizosphere soil Enzyme activity

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Biochar pyrolyzed at low temperature enhanced acidophilous plant growth by promoting rhizospheric microbes in a slightly alkaline urban soil

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