大盆地牧场干旱条件下原产地表现的年际变化

IF 2.8 3区 环境科学与生态学 Q2 ECOLOGY
Lina Aoyama, Lucas Silva, Stella M. Copeland, Rory C. O'Connor, Lauren M. Hallett
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引用次数: 0

摘要

快速的气候变化给恢复工作中的种子采购带来了根本性的挑战。虽然在恢复过程中普遍采用在当地寻找种子的做法,但在未来的气候条件下,当地种子可能无法存活或存续。替代的原产地策略,如气候调整原产地策略,将本地种子与非本地种子混合,旨在提高恢复种群的缓冲能力。我们假设,与来自凉爽潮湿地区的种子相比,来自温暖干燥地区的种子在干旱条件下具有更高的幼苗表现。我们在大盆地牧场进行了一次普通花园实验,预计未来这里会发生更频繁、更严重的干旱事件。我们从沿干旱梯度的六个地点采集瓶丛鼠尾草(Elymus elymoides [Raf.] Swezey)种子,并在三种降雨情况下播种:常温、中度干旱和严重干旱。我们发现幼苗生长的年际差异很大。有一年,在中度干旱的情况下,来自温暖/干旱地区的一些产地的幼苗出苗率很高,随后的成活率也很高。而在另一年,不同产地和降雨处理的出苗率都很低。在两年中度干旱中存活下来的两个产地的幼苗性状存在差异。具体来说,其中一个产地的最适发芽温度高,水分利用效率高,因此可能避免了冻害并抵抗了干旱;而另一个产地的最适发芽温度低,水分利用效率低,因此可能耐受了冻害并躲过了干旱。我们强调,了解不同产地在新陈代谢和压力应对策略方面的这些差异,对于根据未来的气候条件创造适应气候的混合种子非常重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Interannual variation in provenance performance under drought in a Great Basin rangeland
Rapid climate change poses a fundamental challenge to seed sourcing in restoration. While local provenancing is a common practice in restoration, local seeds may not survive or persist under future climate conditions. Alternative provenancing strategies, such as climate‐adjusted provenancing, that mix local seeds with non‐local seeds aim to increase the buffering capacity of restored populations. We hypothesized that seeds sourced from warmer and drier sites have higher seedling performance under drought than seeds sourced from cooler and wetter sites. We conducted a common garden experiment in a Great Basin rangeland where more frequent, severe drought events are expected to increase in the future. We sourced Bottlebrush squirreltail (Elymus elymoides [Raf.] Swezey) seeds from six locations along an aridity gradient and sowed them under three rainfall scenarios: ambient, moderate drought, and severe drought. We found strong interannual variation in seedling recruitment. In 1 year, some provenances from warmer/drier sites had high emergence and subsequent seedling survival under moderate drought. In another, emergence was low across provenances and rainfall treatments. Two provenances that survived 2 years of moderate drought had divergent seedling traits. Specifically, one had a high germination temperature optimum and high water‐use efficiency, such that it likely avoided freezing and resisted drought, while another had a low germination temperature optimum and low water‐use efficiency, such that it likely tolerated freezing and escaped drought. We highlight that understanding these differences in recruitment and stress coping strategies across provenances is important for creating climate‐adaptive seed mixes in anticipation of future climate conditions.
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来源期刊
Restoration Ecology
Restoration Ecology 环境科学-生态学
CiteScore
6.50
自引率
15.60%
发文量
226
审稿时长
12-24 weeks
期刊介绍: Restoration Ecology fosters the exchange of ideas among the many disciplines involved with ecological restoration. Addressing global concerns and communicating them to the international research community and restoration practitioners, the journal is at the forefront of a vital new direction in science, ecology, and policy. Original papers describe experimental, observational, and theoretical studies on terrestrial, marine, and freshwater systems, and are considered without taxonomic bias. Contributions span the natural sciences, including ecological and biological aspects, as well as the restoration of soil, air and water when set in an ecological context; and the social sciences, including cultural, philosophical, political, educational, economic and historical aspects. Edited by a distinguished panel, the journal continues to be a major conduit for researchers to publish their findings in the fight to not only halt ecological damage, but also to ultimately reverse it.
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