湿润农业:提高地下水位和生物炭以减少温室气体排放,同时保持农业泥炭地的作物生产力。

IF 13.5 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Biochar Pub Date : 2025-01-01 Epub Date: 2025-09-15 DOI:10.1007/s42773-025-00487-7
Peduruhewa H Jeewani, Emmanuella Oghenefejiro Agbomedarho, Chris D Evans, David R Chadwick, Davey L Jones
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引用次数: 0

摘要

尽管泥炭的农业生产力很高,但排水和栽培的泥炭极易退化,也是温室气体(GHG)排放的重要来源。本研究探讨了地下水位控制和生物炭应用在减轻农业泥炭温室气体损失方面的潜力。然而,在高地下水位条件下,平衡农业生产需求与保护泥炭生态系统功能是一项重大挑战。因此,我们在一个高(HW)或低(LW)地下水位的控制中环境试验中种植生菜,并使用中环境方法监测4个月的CO2, CH4和N2O的排放。同时测量土壤溶液、植物测量和微生物测序可以确定温室气体排放的关键控制因素。提高WT显著降低了CO2排放量(18%)和N2O排放量(40%),但最终增加了CH4排放量(2.5倍)。与对照+ LW相比,提高WT的生物炭改性提供了最大的CO2当量温室气体排放量减少(4.64 t CO2当量ha-1年-1)。研究发现,生物炭的添加改变了微生物群落组成和多样性(Shannon指数8.9 ~ 9.3),降低了泥炭分解者(如子囊菌)的相对丰度。此外,与未处理的对照相比,生物炭处理产生的生菜生物量增加了38-56%,无论地下水位如何,这表明生物炭的应用除了可以减少温室气体排放外,还可以产生经济效益。造成这些影响的机制似乎既是非生物的(例如,通过生物炭物理化学成分的影响),也通过改变土壤微生物组的生物机制。总体而言,高地下水位与生物炭复合处理提高了土壤总碳含量,减少了泥炭分解,抑制了CH4和N2O排放,提高了作物产量。补充信息:在线版本包含补充资料,可在10.1007/s42773-025-00487-7获得。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Wetter farming: raising water table and biochar for reduced GHG emissions while maintaining crop productivity in agricultural peatlands.

Despite their high agricultural productivity, drained and cultivated peats are highly susceptible to degradation and significant sources of greenhouse gas (GHG) emissions. This study investigates the potential of water table manipulation and biochar application to mitigate GHG losses from agricultural peats. However, balancing the need for agricultural production with securing the ecosystem function of the peat under high water table (WT) conditions poses a significant challenge. Therefore, we grew lettuce in a controlled mesocosm experiment with either a high (HW) or low (LW) water table and monitored emissions of CO2, CH4 and N2O over 4 months using a mesocosm method. Concurrent measurements of soil solution, plant measurements and microbial sequencing allowed identification of the key controls on GHG emissions. Raising the WT significantly reduced CO2 emissions (18%), and N2O emission (40%), but eventually increased CH4 emission (2.5-fold) compared to the Control + LW. Biochar amendment with raised WT provided the strongest reduction in CO2 equivalent GHG emission (4.64 t CO2eq ha-1 yr-1), compared to Control + LW. We found that biochar amendment modified the microbial community composition and diversity (Shannon index 8.9-9.3), lowering the relative abundance of peat decomposers (such as Ascomycota). Moreover, biochar amendments produced 38-56% greater lettuce biomass compared to the unamended controls, irrespective of water table level, suggesting that biochar application could generate economic benefits in addition to reduced GHG emissions. Mechanisms responsible for these effects appeared to be both abiotic (e.g. via effects of the biochar physicochemical composition) and biotic via changing the soil microbiome. Overall, the combination of high-water table and biochar amendment enhanced total soil C, reduced peat decomposition, suppressed CH4 and N2O emissions, and enhanced crop yields.

Supplementary information: The online version contains supplementary material available at 10.1007/s42773-025-00487-7.

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来源期刊
Biochar
Biochar Multiple-
CiteScore
18.60
自引率
10.20%
发文量
61
期刊介绍: Biochar stands as a distinguished academic journal delving into multidisciplinary subjects such as agronomy, environmental science, and materials science. Its pages showcase innovative articles spanning the preparation and processing of biochar, exploring its diverse applications, including but not limited to bioenergy production, biochar-based materials for environmental use, soil enhancement, climate change mitigation, contaminated-environment remediation, water purification, new analytical techniques, life cycle assessment, and crucially, rural and regional development. Biochar publishes various article types, including reviews, original research, rapid reports, commentaries, and perspectives, with the overarching goal of reporting significant research achievements, critical reviews fostering a deeper mechanistic understanding of the science, and facilitating academic exchange to drive scientific and technological development.
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