Short-term biochar effect on soil physicochemical and microbiological properties of a degraded alpine grassland  

作　　者：Jinsheng LI Xinqing SHAO Ding HUANG Kesi LIU Jianying SHANG Qian ZHANG Tianci ZHAO Xiaomeng YANG 

机构地区：[1]College of Grassland Science and Technology,China Agricultural University,Beijing 100193(China) [2]National Field Station of Grassland Ecosystem at Guyuan,Hebei 076550(China) [3]Department of Water and soil Science,China Agricultural University,Beijing 100193(China)

出　　处：《Pedosphere》2022年第3期426-437,共12页土壤圈（英文版）

基　　金：supported by Beijing Science and Technology Plan,China(No.Z181100009618031);the National Natural Science Foundation of China(No.41771255);the National Key Research and Development Program of China(Nos.2016YFC0501902 and 2018YFF0213405);the Key Science and Technology Project of Qinghai Province,China(No.2018-NK-A2)。

摘　　要：Soil remediation is an important part of the restoration process of degraded terrestrial ecosystems.Due to its unique properties,biochar is being used widely as an effective soil modifier in agricultural systems,but research is still rare on biochar application in grassland ecosystems,especially in degraded alpine grasslands.In this study,we conducted a plot experiment to investigate the effect of biochar application on soil physicochemical properties and microorganisms at the 0–20 cm soil depth of a degraded alpine grassland in Qinghai-Tibet Plateau,China.The experiment consisted of four corn straw biochar application levels(0%,0.5%,1%and 2%,with the percentage representing the ratio of biochar weight to the dry weight of soil in the surface 20 cm soil layer).When the biochar addition increased from 0%to 2%,total nitrogen,total organic carbon and available phosphorus in the 0–10 cm soil layer increased by 41%,55%and 45%,respectively,in the second year after biochar addition.Meanwhile,soil electrical conductivity decreased,and soil water content increased.Total microbial,fungal and bacterial biomasses in the 0–10 cm soil layer increased from 9.15 to 12.68,0.91 to 1.34,and 3.85 to 4.55μg g^(-1),respectively.The relative biomasses of saprophytic fungi and methanotrophic bacteria decreased,while the relative biomasses of ectomycorrhizal fungi and arbuscular mycorrhizal fungi increased.These results indicate that biochar has a great potential in improving microbial activity and soil fertility in soil remediation of the degraded alpine grassland.

关 键 词：bacteria fungi microbial community PHOSPHATASE soil fertility soil modifier soil remediation UREASE 

分 类 号：S812.2[农业科学—草业科学]