长期干旱后卡拉哈里南部草本植被的反应

IF 2.6 3区 环境科学与生态学 Q2 ECOLOGY Journal of Arid Environments Pub Date : 2024-04-10 DOI:10.1016/j.jaridenv.2024.105157
Marnus Smit , Paul Malan , Nico Smit , Francois Deacon
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引用次数: 0

摘要

南非卡拉哈里南部 2014-2020 年的严重干旱导致大量草本植物覆盖和立地生物量损失。干旱是这片半干旱稀树草原的常见现象。该地区的植物已经适应了极端多变的降雨和干旱天气。卡拉哈里南部植被的这种适应能力和固有的恢复能力(即恢复原状的能力)使其能够在条件变得更加有利时迅速恢复。然而,由于全球气候变化,预计该地区的干旱频率和强度都将增加。与之相关的干旱加剧也可能使许多物种超出其耐受阈值,从而导致植被动态的永久性变化。本研究旨在确定:(i) 干旱期间草本植物功能群的生长活力、植被丰度和生产力;(ii) 干旱后的恢复速度;(iii) 草本植物功能群的相对恢复力和抵抗力。干旱影响了所有草本植物功能群,因为在干旱期间,草本植物的生长活力、植被丰度和生产力都极低。干旱过后,所有草本植物的生长都开始恢复,但恢复速度各不相同。研究发现,一年生草本植物对干旱的恢复能力很强,而多年生草本植物的恢复能力较弱,但对干旱的抵抗力要强得多。尽管草本植物的抗旱能力强且恢复迅速,但由于干旱前牧场的退化状况,旱后成分变化有限。研究结果强调了面对气候变化采取合理管理措施的重要性。
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Response of herbaceous vegetation in the southern kalahari following a prolonged drought

The severe 2014–2020 drought in the southern Kalahari of South Africa resulted in extensive herbaceous cover and standing biomass losses. Droughts are a common phenomenon in this semi-arid savanna. The plants of this region have adapted to survive extreme rainfall variability and drought events. This adaptability and the inherent resilience (i.e. the ability to recover to its original state) of vegetation in the southern Kalahari enables it to recover quickly when conditions become more favourable. Droughts in the region are, however, predicted to increase in frequency and intensity due to global climate change. The associated increased aridity may also push many species beyond their tolerance threshold, leading to permanent shifts in vegetation dynamics. The aim of this study was to determine: (i) the growth vigour, cover abundance and productivity of herbaceous plant functional groups during the drought, (ii) the rate of post-drought recovery and (iii) the relative resilience and resistance of herbaceous plant functional groups. The drought affected all herbaceous plant functional groups as growth vigour, cover abundance and productivity were extremely low during the drought. All herbaceous growth started to recover post-drought but differed in their rate of response. Annual herbaceous species were found the be remarkably resilient to drought while perennial grasses were less resilient but far more resistant to the drought. Despite the resilience and rapid recovery of herbaceous growth, compositional changes post-drought were limited due to the degraded condition of the rangeland prior to the drought. The results emphasised the importance of sound management practices in the face of climate change.

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来源期刊
Journal of Arid Environments
Journal of Arid Environments 环境科学-环境科学
CiteScore
5.70
自引率
3.70%
发文量
144
审稿时长
55 days
期刊介绍: The Journal of Arid Environments is an international journal publishing original scientific and technical research articles on physical, biological and cultural aspects of arid, semi-arid, and desert environments. As a forum of multi-disciplinary and interdisciplinary dialogue it addresses research on all aspects of arid environments and their past, present and future use.
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