Chemical Composition of the Aboveground Tissues of Miscanthus × giganteus and Relationships to Soil Characteristics

IF 3.1 3区工程技术 Q3 ENERGY & FUELS BioEnergy Research Pub Date : 2024-01-09 DOI:10.1007/s12155-023-10718-z

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Abstract

To reduce the C footprint of human activities, there is a growing need for alternative energy sources including the production of bioenergy feedstocks. Miscanthus × giganteus is a high yielding grass with low environmental impact and high potential for feedstock use. Studying the composition of the aboveground tissues of Miscanthus is important for understanding feedstock quality for biofuel conversion and how crop residue quality may affect soil input management. Data on Miscanthus leaf and stem chemistry including carbon (C), nitrogen (N), macronutrient concentrations, and the optical characteristics of the water extractable organic matter (WEOM) was analyzed to identify differences in composition between aboveground tissues and modeled to identify soil variables that may be correlated with tissue chemistry. Leaves and stems were dominated by N, potassium (K), calcium (Ca), phosphorus (P), and magnesium (Mg), but overall, the leaves contained higher nutrient concentrations compared to the stems. The leaves displayed elevated Si:K (0.0935) and Ca:K (0.445) ratios and lower C:N (36) and C:P (323) ratios compared to the stems (0.0560, 0.145, 150, and 645, respectively). Leaf WEOM contained large, aromatic, and complex structures, while the stem WEOM was dominated by small, recently produced structures. Varying relationships were found between tissue C and the mobile C pool in surface (0–15 cm) and deep (45–60 cm) soils. Overall, Miscanthus leaves had a chemical composition indicative of reduced biofuel quality compared to the stems. The relationships with soil mobile C suggest a dynamic linkage between Miscanthus physiology and this active soil C pool. These results have implications for crop nutrient allocation and nutrient management practices.

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Miscanthus × giganteus 地下组织的化学成分及其与土壤特性的关系

摘要为减少人类活动的碳足迹，对替代能源包括生物能源原料生产的需求日益增长。Miscanthus × giganteus 是一种高产禾本科植物，对环境的影响小，用作原料的潜力大。研究 Miscanthus 地上组织的成分对于了解生物燃料转化的原料质量以及作物残留质量如何影响土壤投入管理非常重要。我们分析了 Miscanthus 叶和茎的化学成分数据，包括碳（C）、氮（N）、宏量营养素浓度和水提取有机物（WEOM）的光学特征，以确定地上组织之间成分的差异，并建立模型以确定可能与组织化学相关的土壤变量。氮、钾、钙、磷和镁在叶片和茎中占主导地位，但总体而言，叶片的养分浓度高于茎。与茎相比，叶片的硅钾比（0.0935）和钙钾比（0.445）较高，而碳氮比（36）和碳磷比（323）较低（分别为 0.0560、0.145、150 和 645）。叶片 WEOM 含有大型、芳香和复杂的结构，而茎 WEOM 则以小型、新近产生的结构为主。在表层土壤（0-15 厘米）和深层土壤（45-60 厘米）中，组织碳和移动碳库之间的关系各不相同。总体而言，与茎相比，马齿苋叶片的化学成分表明生物燃料质量下降。与土壤流动碳的关系表明，木黄草的生理机能与这一活跃的土壤碳库之间存在动态联系。这些结果对作物养分分配和养分管理实践具有重要意义。

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来源期刊

BioEnergy Research ENERGY & FUELS-ENVIRONMENTAL SCIENCES

CiteScore

6.70

自引率

8.30%

发文量

174

审稿时长

3 months

期刊介绍： BioEnergy Research fills a void in the rapidly growing area of feedstock biology research related to biomass, biofuels, and bioenergy. The journal publishes a wide range of articles, including peer-reviewed scientific research, reviews, perspectives and commentary, industry news, and government policy updates. Its coverage brings together a uniquely broad combination of disciplines with a common focus on feedstock biology and science, related to biomass, biofeedstock, and bioenergy production.