A meta-analysis to explore the impact of straw decomposing microorganism inoculant-amended straw on soil organic carbon stocks  

作　　者：Chao Ma Zhifeng He Jiang Xiang Kexin Ding Zhen Zhang Chenglong Ye Jianfei Wang Yusef Kianpoor Kalkhajeh 

机构地区：[1]Anhui Province Key Lab of Farmland Ecological Conservation and Pollution Prevention,School of Resources and Environment,Anhui Agricultural University,Hefei 230036,China [2]Research Centre of Phosphorus Efficient Utilization and Water Environment Protection along the Yangtze River Economic Belt,Anhui Agricultural University,Hefei 230036,China [3]Department of Environmental Science,College of Science,Mathematics and Technology,Wenzhou-Kean University,325060 Ouhai,China

出　　处：《Journal of Integrative Agriculture》2025年第4期1577-1587,共11页农业科学学报(英文版)

基　　金：supported by the Key Science and Technology Project of Anhui Province,China(2023n06020056);the National Natural Science Foundation of China(32071628);the Colleges and Universities Science Foundation of Anhui Province,China(2024AH020002)。

摘　　要：Although the application of straw decomposing microorganism inoculants(SDMI)can accelerate straw decomposition,the underlying mechanisms affecting soil organic carbon(SOC)under different scenarios remain unclear.We conducted a meta-analysis using 226 observations from 86 studies on SOC changes under straw return with or without SDMI applications.Overall,our results indicated that straw with SDMI application increased the SOC stock by 1.51%at an initial carbon-to-nitrogen ratio(ICNR)>25(P<0.05),while the effect of ICNR≤25was insignificant.In particular,at ICNR>25,application of SDMI-treated straw increased SOC stocks in northern temperate continental areas(NTC)higher than in subtropical monsoon regions(STM).Furthermore,the straw with SDMI application increased higher SOC stocks in soils with pH>7.5 than those with pH≤7.5.In terms of agricultural management practices,SOC stocks were significantly higher in straw buried(SB),the experimental duration of straw return(EDSR)≥1 year,the straw return amount(SRA)>6,000 kg ha^(–1),and the SDMI application rate(SDMIR)>30 kg ha^(–1)conditions.The effect of straw with SDMI on SOC stocks under straw burying(SB)was significantly higher than that under straw mulching(SM)at ICNR≤25.At ICNR>25,EDSR,SDMIR,and the mean annual precipitation(MAP)were the main drivers of the effect of SDMI addition to straw on SOC stocks.Straw with SDMI induced SOC stock increases which increased with EDSR and decreased with increasing MAP.These findings provide a scientific basis for decision-makers and stakeholders to improve soil C management via the application of SDMI-amended straw at both regional and large scales.

关 键 词：carbon sequestration META-ANALYSIS straw-decomposing microbial inoculants soil organic carbon stock straw return straw retention 

分 类 号：S141.4[农业科学—肥料学]