Evolution of soil carbon stocks under Miscanthus × giganteus and Miscanthus sinensis across contrasting environmental conditions,Global Change Biology Bioenergy

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Evolution of soil carbon stocks under Miscanthus × giganteus and Miscanthus sinensis across contrasting environmental conditions
Global Change Biology Bioenergy ( IF 5.9 ) Pub Date : 2020-10-04 , DOI: 10.1111/gcbb.12760
Malick S. Ouattara ₁ , Anabelle Laurent ₁ , Fabien Ferchaud ₂ , Magali Berthou ₃ , Elsa Borujerdi ₄ , Arnaud Butier ₁ , Pierre Malvoisin ₅ , Dominique Romelot ₆ , Chantal Loyce ₁

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Miscanthus is a C4 bioenergy perennial crop characterized by its high potential yield. Our study aimed to compare the carbon storage capacities of Miscanthus sinensis (M. sinensis) with that of Miscanthus × giganteus (M. × giganteus) in field conditions in different types of soils in France. We set up a multi‐environment experimental network. On each trial, we tested two treatments: M. × giganteus established from rhizomes (Gr) and M. sinensis transplanted seedlings (Sp). We quantified the soil organic carbon (SOC) stock at equivalent soil mass for both genotypes in 2014 and 2019 and for two sampling depths: L1 (ca. 0–5 cm) and L1‐2 (ca. 0–30 cm). We also calculated the total and annual variation of the SOC stock and investigated factors that could explain the variation and the initial state of the SOC stock. ANOVAs were performed to compare the SOC stock, as well as the SOC stock variation rates across treatments and soil layers. Results showed that the soil bulk density did not vary significantly between 2014 and 2019 for both treatments (Gr and Sp). The SOC concentration (i.e. SOC expressed in g/kg) increased significantly between 2014 and 2019 in L1, whereas no significant evolution was found in L2 (ca. 5–30 cm). The SOC stock (i.e. SOC expressed in t/ha) increased significantly in the superficial layer L1 for M. × giganteus and M. sinensis, by 0.48 ± 0.41 and 0.54 ± 0.25 t ha⁻¹ year⁻¹ on average, respectively, although no significant change was detected in the layer L1‐2 for both genotypes. Moreover, SOC stocks in 2019 did not differ significantly between M. × giganteus and M. sinensis in the soil layers L1 and L1‐2. Lastly, our results showed that the initial SOC stock was significantly higher when miscanthus was grown after set‐aside than after annual crops.

中文翻译：

不同环境条件下芒草和芒草土壤碳储量的演变

芒草是多年生C4生物能源作物，其潜在产量高。我们的研究旨在比较田间条件下法国芒草（Miscanthus sinensis（M. sinensis））和芒草（Miscanthus×giganteus（M.×giganteus））的碳储存能力。我们建立了一个多环境的实验网络。在每个试验中，我们测试了两种治疗方法：从根茎（Gr）和中华按蚊建立的M.×giganteus 移植的幼苗（Sp）。我们对2014年和2019年两种基因型的等效土壤质量的土壤有机碳（SOC）库进行了量化，并采用了两个采样深度：L1（大约0-5厘米）和L1-2（大约0-30厘米）。我们还计算了SOC存量的总和年度变化，并调查了可以解释SOC存量的变化和初始状态的因素。进行方差分析以比较SOC储量以及处理和土壤层之间的SOC储量变化率。结果表明，两种处理方式（Gr和Sp）的土壤容重在2014年至2019年之间变化不大。L1的SOC浓度（即，SOC，以g / kg表示）在2014年至2019年之间显着增加，而L2（约5–30 cm）没有发现明显的变化。SOC库存（即M.×giganteus和M. sinensis平均分别为0.48±0.41和0.54±0.25 t ha - ¹ 年- ¹年，尽管在两种基因型的L1-2层均未检测到显着变化。此外，SOC股2019没有显著之间不同M.×巨和M.吸虫在土壤层L1和L1-2。最后，我们的结果表明，在放置了金盏花后，最初的SOC储量要比一年生作物后的高。

更新日期：2020-12-10

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