Salvador Grover, Hannah M. Anderson, Jeremy Fleck, Charlene N. Kelly, Jamie Schuler, Matthew D. Ruark, Zachary B. Freedman
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The objectives of this study were to examine select biological and chemical properties related to stable soil organic matter (SOM) production from the growth of switchgrass and willow on marginal soil over two growing seasons and whether biochar amendment can positively affect these parameters. To address our objectives, paired former surface mined lands and non-mine impacted marginal agriculture sites were selected across West Virginia, USA, and biochar and unamended control treatments were imposed. Through the first two growing seasons, microbial activity and demand for carbon (C) increased and was accompanied by a shift in extracellular enzyme investment for decomposition-associated enzymes. Mineral-associated organic matter C increased over the two growing seasons, and this increase was greater in the mine sites compared to the agriculture sites. Compared to each site's previous land use, C losses were observed under bioproduct systems in the agriculture, but not the mine sites. Biochar amendments did not impact microbial activity but did increase the C:N of SOM. Overall, our results suggest that the early growth of switchgrass and willow can result in C accumulation in marginal and highly degraded lands.</p>","PeriodicalId":101043,"journal":{"name":"Proceedings - Soil Science Society of America","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/saj2.20647","citationCount":"0","resultStr":"{\"title\":\"Early production of switchgrass (Panicum virgatum L.) and willow (Salix spp.) indicates carbon accumulation potential in Appalachian reclaimed mine and agriculture soil\",\"authors\":\"Salvador Grover, Hannah M. Anderson, Jeremy Fleck, Charlene N. Kelly, Jamie Schuler, Matthew D. Ruark, Zachary B. 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To address our objectives, paired former surface mined lands and non-mine impacted marginal agriculture sites were selected across West Virginia, USA, and biochar and unamended control treatments were imposed. Through the first two growing seasons, microbial activity and demand for carbon (C) increased and was accompanied by a shift in extracellular enzyme investment for decomposition-associated enzymes. Mineral-associated organic matter C increased over the two growing seasons, and this increase was greater in the mine sites compared to the agriculture sites. Compared to each site's previous land use, C losses were observed under bioproduct systems in the agriculture, but not the mine sites. Biochar amendments did not impact microbial activity but did increase the C:N of SOM. 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引用次数: 0
摘要
在退化土地上生产开关草(Panicum virgatum L.)和柳树(Salix spp.)然而,在高度退化的土壤中,这些作物的生产如何改变植物-土壤-微生物之间的相互作用,从而影响土壤碳的积累,这方面的研究还很欠缺。本研究的目的是考察开关草和柳树在边缘土壤上生长两个生长季节所产生的与稳定土壤有机质(SOM)相关的生物和化学特性,以及生物炭添加剂是否能对这些参数产生积极影响。为了实现我们的目标,我们在美国西弗吉尼亚州选择了成对的前地表采矿场和未受采矿影响的边缘农业用地,并施加了生物炭和未添加生物炭的对照处理。在头两个生长季节,微生物的活动和对碳(C)的需求增加了,与此同时,与分解相关的细胞外酶投资也发生了变化。在两个生长季中,与矿物质相关的有机物碳增加了,与农业区相比,矿区的增加幅度更大。与每个地点以前的土地使用情况相比,在农业生物产品系统下观察到碳损失,而在矿区则没有。生物炭添加剂不会影响微生物活动,但会增加 SOM 的 C:N 值。总之,我们的研究结果表明,开关草和柳树的早期生长可导致贫瘠和高度退化土地的碳积累。
Early production of switchgrass (Panicum virgatum L.) and willow (Salix spp.) indicates carbon accumulation potential in Appalachian reclaimed mine and agriculture soil
The production of bioproduct feedstocks such as switchgrass (Panicum virgatum L.) and willow (Salix spp.) on degraded lands provides an opportunity to grow dedicated bioenergy crops with the potential to capture and store carbon in the soil while reducing competition with land for food production. However, how the production of these crops alters plant–soil–microbe interactions that govern soil C accumulation in highly degraded soil is underexplored. The objectives of this study were to examine select biological and chemical properties related to stable soil organic matter (SOM) production from the growth of switchgrass and willow on marginal soil over two growing seasons and whether biochar amendment can positively affect these parameters. To address our objectives, paired former surface mined lands and non-mine impacted marginal agriculture sites were selected across West Virginia, USA, and biochar and unamended control treatments were imposed. Through the first two growing seasons, microbial activity and demand for carbon (C) increased and was accompanied by a shift in extracellular enzyme investment for decomposition-associated enzymes. Mineral-associated organic matter C increased over the two growing seasons, and this increase was greater in the mine sites compared to the agriculture sites. Compared to each site's previous land use, C losses were observed under bioproduct systems in the agriculture, but not the mine sites. Biochar amendments did not impact microbial activity but did increase the C:N of SOM. Overall, our results suggest that the early growth of switchgrass and willow can result in C accumulation in marginal and highly degraded lands.