The importance of soil seed banks for biodiversity restoration in degraded grasslands

IF 1 4区 生物学 Q3 PLANT SCIENCES
Martina Fabšičová, Tomáš Vymyslický, Ivana Frei, Magda Zdražílková, Sabina Smetanová, Jan Winkler, Martin Jiroušek
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Abstract

To effectively restore species and habitat diversity in poorly managed degraded grasslands, it is important to understand the relationship between the soil seed bank and aboveground vegetation. Our study aimed to describe changes in soil seed bank composition compared to aboveground vegetation under two ploughing regimes (annual and single ploughing) of narrow strips on the edges of artificially grassed old fields in Podyjí National Park, the Czech Republic. We used the seed germination method, multivariate analyses and Kruskal–Wallis tests to compare differences in the proportion of species and individual numbers in the soil seed bank based on the origin of species (native species, archaeophytes, neophytes) and their habitat preferences (segetal, ruderal, grassland, endangered species) in two types of grasslands with varying soil moisture content. The highest numbers of individuals were present in annually ploughed dry grasslands whereas single ploughing in mesic grasslands resulted in greater species diversity. Ploughing increased the numbers of seedlings of all groups and promoted archaeophytes, grassland specialists, native species and ruderals in dry grasslands whereas mesic grasslands hosted segetal specialists and neophytes. Threatened plants and invasive species rarely emerged from the soil seed bank. The study also revealed the highest similarity between the soil seed bank and aboveground vegetation in annually ploughed plots. It gradually decreased during vegetation succession in the single ploughed variants. Whereas annual ploughing supported segetal specialists, single ploughing promoted grassland species in dry habitats. Neither type of ploughing can be recommended in mesic grasslands because of the risk of inducing the spread of expansive ruderals or invasive neophytes.

Abstract Image

土壤种子库对于恢复退化草地生物多样性的重要性
为了有效恢复管理不善的退化草地的物种和栖息地多样性,了解土壤种子库和地上植被之间的关系非常重要。我们的研究旨在描述在捷克共和国波季伊国家公园人工种草的老田地边缘窄带的两种耕作制度(每年耕作和单次耕作)下,土壤种子库组成与地上植被相比发生的变化。我们采用种子萌发法、多元分析和 Kruskal-Wallis 检验,比较了在土壤含水量不同的两种草地中,根据物种来源(本地物种、古生植物、新生物)及其栖息地偏好(segetal、ruderal、草地、濒危物种),土壤种子库中物种比例和个体数量的差异。每年犁耕的干旱草地上的个体数量最多,而中耕草地上的单次犁耕则导致物种多样性增加。犁耕增加了所有类群的幼苗数量,并促进了干旱草地上的古生植物、草地专类植物、本地物种和裸子植物的生长,而中耕草地上则生长着分生专类植物和新生植物。土壤种子库中很少出现濒危植物和入侵物种。研究还发现,在每年耕作的地块中,土壤种子库与地上植被的相似度最高。在单耕变体的植被演替过程中,相似度逐渐降低。常年犁地有利于segetal specialists,而单次犁地则有利于干旱生境中的草地物种。这两种犁耕方式都不适合在中生性草地上使用,因为有可能导致扩张性杂草或外来新植被的蔓延。
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来源期刊
Folia Geobotanica
Folia Geobotanica 生物-植物科学
CiteScore
2.40
自引率
0.00%
发文量
18
审稿时长
>12 weeks
期刊介绍: The journal Folia Geobotanica publishes articles in vegetation science, plant ecology and plant systematics, including the topics of temporal community patterns, population and ecosystem ecology, and invasion and conservation ecology. Within the field of plant systematics, Folia Geobotanica welcomes papers on systematic and evolutionary botany, including phylogenetic reconstructions, phylogeographic and biogeographic inferences, studies of microevolutionary processes, taxonomic studies, and broader taxonomic revisions.
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