Perennial rhizomatous grasses: Can they really increase species richness and abundance in arable land?—A meta‐analysis,Global Change Biology Bioenergy

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Perennial rhizomatous grasses: Can they really increase species richness and abundance in arable land?—A meta‐analysis
Global Change Biology Bioenergy ( IF 5.9 ) Pub Date : 2020-09-04 , DOI: 10.1111/gcbb.12750
Jan Lask ₁ , Elena Magenau ₁ , Andrea Ferrarini ₂ , Andreas Kiesel ₁ , Moritz Wagner ₁ , Iris Lewandowski ₁

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Perennial rhizomatous grasses (PRG), such as miscanthus and switchgrass, are considered promising lignocellulosic feedstocks. Their cultivation is expected to experience a significant increase in the near future, as it offers a wide range of benefits. For instance, when PRG replace typical annual crops, positive biodiversity impacts are usually anticipated. However, to date, there is no solid, statistically strong evidence for this hypothesis. This study aims to evaluate its validity through a meta‐analysis based on an extensive systematic literature review of research comparing biodiversity attributes in PRG and common annual crops. Dynamics of species richness and abundance in response to PRG cultivation were quantitatively evaluated drawing on 220 paired comparisons from 25 studies. This includes data on five taxonomic groups—arthropods, birds, earthworms, mammals and plants—and three PRG—miscanthus, switchgrass and reed canary grass. The results indicate that biodiversity tends to be higher in PRG cultivations relative to the reference crops, but the initial hypothesis of significantly beneficial impacts could not be confirmed. Trends were specific to the individual taxonomic groups: significantly higher biodiversity was found for plants and small mammals. Positive but insignificant trends were observed for arthropods and birds, while earthworm response was neutral and insignificant. More substantial conclusions could not be drawn, which is mainly due to the low number of studies conducting biodiversity assessments in PRG cultivations that included a comparison with annual crops. In addition, a detailed analysis of the observed responses was impaired by poor reporting of the parameters influencing biodiversity in the studies reviewed, such as planting and crop density, as well as yields. For this reason, we conclude with a call for improved data reporting in biodiversity assessments of PRG cultivations and detail requirements for future biodiversity research.

中文翻译：

多年生根茎草：它们真的可以增加耕地中物种的丰富度和丰度吗？—荟萃分析

多年生根茎草（PRG），如桔梗和柳枝switch，被认为是有前途的木质纤维素原料。由于其广泛的益处，预计它们的种植在不久的将来会大大增加。例如，当PRG替代典型的一年生作物时，通常预计会对生物多样性产生积极影响。但是，迄今为止，尚无确凿的，统计学上有力的证据支持这一假设。本研究旨在通过荟萃分析评估其有效性，该研究基于广泛的系统文献综述，对PRG和常见一年生作物的生物多样性属性进行了比较。根据来自25个研究的220个配对比较，定量评估了响应PRG培养的物种丰富度和丰度的动态。其中包括五个分类组的数据：节肢动物，鸟类，mi，哺乳动物和植物-以及三个PRG-芒草，柳枝switch和芦苇金丝雀草。结果表明，相对于参考作物，PRG种植中的生物多样性趋向于更高，但尚不能证实产生明显有益影响的最初假设。趋势特定于单个分类组：发现植物和小型哺乳动物的生物多样性明显更高。节肢动物和鸟类观察到积极但微不足道的趋势，而response的反应是中性且微不足道的。无法得出更实质性的结论，这主要是由于在PRG种植中进行生物多样性评估的研究数量少，其中包括与一年生作物的比较。此外，在所审查的研究中，关于影响生物多样性的参数的报告不多，如种植和作物密度以及单产，因此无法对观察到的反应进行详细的分析。因此，我们呼吁在PRG栽培的生物多样性评估中改善数据报告，并详细说明未来生物多样性研究的要求。

更新日期：2020-10-15

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