Optimizing biochar addition for vermicomposting:a comprehensive evaluation of earthworms’activity,N_(2)O emissions and compost quality  

作　　者：Yupeng Wu Qinfen Li Yong Zheng Xingjun Xiong Yunfeng Chen Muhammad Shaaban Ronggui Hu 

机构地区：[1]College of Resources and Environment,Huazhong Agricultural University,Wuhan 430070,China [2]Institute of Environment and Plant Protection,Chinese Academy of Tropical Agricultural Sciences,Haikou 571158,China [3]Power China Kunming Engineering Corporation Limited,Kunming 650051,China [4]Institute of Plant Protection and Soil Fertilizer,Hubei Academy of Agricultural Sciences,Wuhan 430064,China [5]Department of Soil Science,Bahauddin Zakariya University,Multan 60800,Pakistan

出　　处：《Biochar》2023年第1期59-70,共12页生物炭（英文）

基　　金：Major Science and Technology Program of Hainan Province(ZDKJ2021009);National Natural Science Foundation of China(32171638);Yunan Science and Technology Talents and Platform Program(202205AF150004).

摘　　要：Biochar addition has been widely used in the field to mitigate soil nitrous oxide(N_(2)O)emissions,and can be considered as a potential method to reduce N_(2)O emissions during vermicomposting.However,excessive biochar addition may inhibit earthworms’activity.Thus,it is crucial to clarify the optimum addition volumes of biochar during vermicomposting.This study evaluated the impact of addition of various amounts of biochar(0,5,10,15,20 and 25%of total amount of feedstock)on earthworms’(Eisenia fetida)activity,N_(2)O emission and compost quality during vermicomposting.Compared with the treatment without biochar added,5%of biochar application significantly increased earthworm total biomass(from 177.5 to 202.2 g pot^(−1)),and cumulative burrowing activity(from 47.0%to 52.2%pixel per terrarium).The increased earthworms activity stimulated the vermicomposting process and led to the best quality of compost,which showed the highest total nutrient content(5.38%)and a significantly higher germination percentage of seeds(88%).Although N_(2)O emissions were slightly increased by 5%biochar addition,a nonsignificant difference was found between the treatment with 5%biochar and the treatment without biochar added.On the contrary,20%and 25%biochar addition not only lowered N_(2)O emissions,but also significantly decreased the quality of compost.The results suggest that 5%biochar application is an appropriate amount to improve the quality of compost without significant N_(2)O emissions.

关 键 词：EARTHWORM Biochar addition Nitrous oxide Functional genes Burrowing activity 

分 类 号：S141.4[农业科学—肥料学]