Biochar mitigates the stimulatory effects of straw incorporation on N2O emission and N2O/(N2O + N2) ratio in upland soil

被引：0

作者：

Li, Chenglin ^{[1
,2
,3
]}

Wei, Zhijun ^{[1
,2
,3
]}

Wang, Xiaomin ^{[1
,2
,3
]}

Ma, Xiaofang ^{[1
]}

Tang, Quan ^{[4
]}

Zhao, Bingzi ^{[1
,2
]}

Shan, Jun ^{[1
,2
,3
]}

Yan, Xiaoyuan ^{[1
,2
,3
]}

机构：

[1] Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Chinese Acad Sci, Inst Soil Sci, Changshu Natl Agroecosyst Observat & Res Stn, Nanjing 210008, Peoples R China

[4] Yangzhou Univ, Minist Agr & Rural Affairs, Key Lab Arable Land Qual Monitoring & Evaluat, Yangzhou 225009, Peoples R China

来源：

JOURNAL OF ENVIRONMENTAL MANAGEMENT | 2024年 / 369卷

基金：

中国国家自然科学基金;

关键词：

Nitrous oxide; Denitrification product ratio; SOC sequestration; Biochar amendment; Straw incorporation; Bacterial community; GREENHOUSE-GAS EMISSIONS; ORGANIC-MATTER; SOIL FERTILITY; IMPACTS; DENITRIFICATION; MECHANISMS; INCUBATION; AMENDMENT; ABUNDANCE; SYSTEM;

D O I：

10.1016/j.jenvman.2024.122318

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Straw incorporation, a common agricultural strategy designed to enhance soil organic carbon (SOC), often leads to increased nitrous oxide (N2O) emission, potentially offsetting benefits of SOC sequestration. However, the mechanism and mitigation options for the enhanced N2O emission following straw incorporation remain unclear. Here, N-2 and N2O emission rate, as well as N2O/(N2O + N-2) ratio under four different fertilization treatments [i.e., non-fertilization (Control), conventional chemical fertilization (CF), conventional chemical fertilization plus straw incorporation (SWCF), and conventional chemical fertilization plus straw and biochar incorporation (SWBCF)] were investigated by a robotized sampling and analysis system. High-throughput sequencing was also employed to assess the variation of bacterial community across different treatments. The results showed CF, SWCF, and SWBCF fertilization treatments significantly increased N2O emission rate by 1.04, 2.01, and 1.29 folds, respectively, relative to Control treatment. Albeit no significant enhancements in N-2 emission rate, the N2O/(N2O + N-2) ratio significantly increased by 65.53%, 1.10 folds, and 69.49% in CF, SWCF, and SWBCF treatments, respectively. The partial least squares path modeling analysis further revealed that fertilization treatments slightly increased N-2 emission rate by increasing DOC content and keystone OTUs abundance. While the enhanced N2O emission rate and N2O/(N2O + N-2) ratio in the fertilization treatments was primarily determined by reducing DOC/NO3- ratio and specific bacteria module abundance dominated by Gaiellales, Solirubrobacterales, and Micrococcales. Furthermore, SWBCF treatment alleviated the increase in net global warming potential due to straw incorporation, as indicated by the higher SOC sequestration and lower N2O/(N2O + N-2) ratio therein. Collectively, these findings suggest that simultaneous application of straw and biochar has the potential to mitigate the risk of increased N2O emission from straw incorporation. This study provides valuable insights for developing targeted strategies in C sequestration and greenhouse gas mitigation, tackling the challenge presented by global climate change.

引用

页数：11