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Forb community responses to an extensive drought in two contrasting land-use types of a semi-arid Lowveld savanna
African Journal of Range & Forage Science ( IF 1.4 ) Pub Date : 2020-01-02 , DOI: 10.2989/10220119.2020.1726464
F Siebert 1 , J Klem 1 , H Van Coller 1
Affiliation  

Projected increases in the frequency and severity of drought events are expected to impose changes in the ecology of native forb communities in semi-arid ecosystems. We examined the state of forb communities during, and directly after an extreme drought event across two contrasting land-use types, which included a protected area (high diversity of free roaming wild herbivores) and communal rangeland (long history of intensive cattle grazing) in a semi-arid Lowveld savanna of the Gazankulu area, South Africa. Forb floristic data were collected towards the end of the drought and repeated after the drought release a few months later. Forb community composition was significantly different among land-use types. Community changes were not induced by annual forb emergence alone, but through species-specific dominance shifts, which differed among land-use types. Forb richness, diversity and biomass were equally low at both land-use types and increased significantly after the drought release, although the magnitude of response was much stronger in the protected area, whereas drought contributed to a directional change in the protected area with a complete post-drought turnover in both annual and perennial forb species, much less variability was observed in the communal rangeland, which may suggest long-term effects imposed by land-use history.

中文翻译:

Forb 社区对半干旱低地稀树草原两种截然不同的土地利用类型的广泛干旱的反应

预计干旱事件发生频率和严重程度的增加将改变半干旱生态系统中本地杂草群落的生态。我们在极端干旱事件期间和之后直接检查了两种截然不同的土地利用类型的外来社区的状态,其中包括保护区(自由漫游的野生食草动物的高度多样性)和公共牧场(集约化放牧的悠久历史)南非加赞库鲁地区的半干旱低地稀树草原。Forb 植物区系数据是在干旱结束时收集的,并在几个月后干旱解除后重复进行。Forb群落组成在土地利用类型之间存在显着差异。群落变化不仅仅由一年一度的杂草出现引起,而是通过物种特定的优势转变,土地利用类型之间存在差异。两种土地利用类型的林木丰富度、多样性和生物量都同样低,并且在干旱释放后显着增加,尽管保护区的响应程度要强得多,而干旱导致保护区发生了方向性变化,完全一年生和多年生杂草的干旱后周转率,在公共牧场中观察到的变异性要小得多,这可能表明土地利用历史施加的长期影响。
更新日期:2020-01-02
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