Positive effect of carbohydrate-metabolizing bacteria determines increasing soil organic carbon during long-term fertilization and straw returning in the black soil region of China  

作　　者：Yingxin LI Yu SUN Eiko E.KURAMAE Shaoqing ZHANG Enze WANG Zongmu YAO Fahad NASIR Lei TIAN Qiang GAO Chunjie TIAN 

机构地区：[1]State Key Laboratory of Black Soils Conservation and Utilization,Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130102,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Department of Microbial Ecology,Netherlands Institute of Ecology(NIOO-KNAW),Wageningen 6708 PB,The Netherlands [4]Ecology and Biodiversity Group,Department of Biology,Institute of Environmental Biology,Utrecht University,Padualaan 8,Utrecht 3584 CH,The Netherlands [5]Jilin Agricultural University,Key Lab Soil Resource Sustainable Utilization for Jilin Province Commodity Grain Bases,Changchun 130118,China

出　　处：《Pedosphere》2024年第5期853-864,共12页土壤圈（英文版）

基　　金：funded by the Science and Technology Cooperation Project Between Jilin Province and Chinese Academy of Sciences(No.2022000170);the National Natural Science Foundation of China(Nos.41920104008 and U22A20593);the Strategic Priority Research Program of CAS(No.XDA28020400)。

摘　　要：In the context of global efforts to reduce carbon(C)emissions,several studies have examined the effects of agricultural practices such as straw returning and fertilization on C sequestration by microorganisms.However,our understanding of the specific microbial groups and their roles in long-term C increase remains limited.In this study,a 36-year(1984-2020)farmland experiment was conducted to investigate the impact of bacterial C metabolism on the augmentation of organic C in a Typic Hapludoll(Mollisol)in the black soil region of Jilin Province,Northeast China.Our results demonstrated a noteworthy increase in the diversity of microorganisms in the farmland as a result of long-term straw returning and application of mixed chemical fertilizers.However,by examining the functions of microorganisms involved in C metabolism,it was observed that the effects of fertilization on C metabolism were relatively consistent.This consistency was attributed to a deterministic competitive exclusion process,which minimized the differences between treatment groups.On the other hand,the influence of straw addition on C metabolism appeared to follow a more random pattern.These changes in microbial activity were closely linked to the downregulation of core metabolic pathways related to C metabolism.Notably,long-term fertilization had a negative impact on soil organic C levels,while long-term straw returning plus fertilization resulted in a positive increase in soil organic C.These findings have important implications for enhancing soil organic C and grain yield in the regions with typical black soil.

关 键 词：community assembly metabolic pathway microbial activity Mollisol soil organic C straw addition 

分 类 号：S153.6[农业科学—土壤学]