Enhancing carbon sequestration and greenhouse gas mitigation in semiarid farmland:The promising role of biochar application with biodegradable film mulching  

作　　者：Jinwen Pang Zhonghong Tian Mengjie Zhang Yuhao Wang Tianxiang Qi Qilin Zhang Enke Liu Weijun Zhang Xiaolong Ren Zhikuan Jia Kadambot H.M.Siddique Peng Zhang 

机构地区：[1]College of Agronomy,Northwest A&F University,Yangling 712100,China [2]Key Laboratory of Crop Physiology,Ecology and Tillage Science in Northwestern Loess Plateau,Ministry of Agriculture and Rural Affairs,Northwest A&F University,Yangling 712100,China [3]Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences,Beijing 100081,China [4]Crop Research Institute,Ningxia Academy of Agricultural and Forestry Sciences,Yinchuan 750199,China [5]The UWA Institute of Agriculture,The University of Western Australia,Perth WA6001,Australia

出　　处：《Journal of Integrative Agriculture》2025年第2期517-535,共19页农业科学学报(英文版)

基　　金：supported by the National Key Research and Development Program of China(2021YFE0101300 and 2021YFD1901102);the project supported by the Natural Science Basic Research Plan in Shaanxi Province,China(2023-JC-YB-185);the Ningxia Key Research and Development Program,China(2023BCF01018)。

摘　　要：Long-term mulching has improved crop yields and farmland productivity in semiarid areas,but it has also increased greenhouse gas(GHG)emissions and depleted soil fertility.Biochar application has emerged as a promising solution for addressing these issues.In this study,we investigated the effects of four biochar application rates(no biochar(N)=0 t ha^(-1),low(L)=3 t ha^(-1),medium(M)=6 t ha^(-1),and high(H)=9 t ha^(-1))under film mulching and no mulching conditions over three growing seasons.We assessed the impacts on GHG emissions,soil organic carbon sequestration(SOCS),and maize yield to evaluate the productivity and sustainability of farmland ecosystems.Our results demonstrated that mulching increased maize yield(18.68-41.80%),total fixed C in straw(23.64%),grain(28.87%),and root(46.31%)biomass,and GHG emissions(CO_(2),10.78%;N_(2)O,3.41%),while reducing SOCS(6.57%)and GHG intensity(GHGI;13.61%).Under mulching,biochar application significantly increased maize yield(10.20%),total fixed C in straw(17.97%),grain(17.69%)and root(16.75%)biomass,and SOCS(4.78%).Moreover,it reduced the GHG emissions(CO_(2),3.09%;N_(2)O,6.36%)and GHGI(12.28%).These effects correlated with the biochar addition rate,with the optimal rate being 9.0 t ha^(-1).In conclusion,biochar application reduces CO_(2) and N_(2)O emissions,enhances CH_(4) absorption,and improves maize yield under film mulching.It also improves the soil carbon fixation capacity while mitigating the warming potential,making it a promising sustainable management method for mulched farmland in semiarid areas.

关 键 词：BIOCHAR film mulching greenhouse gas emissions carbon sequestration 

分 类 号：X71[环境科学与工程—环境工程]