Plasticity response of desert shrubs to intense drought events at different phenophases under the context of climate change

IF 4.5 2区生物学 Q2 ENVIRONMENTAL SCIENCES

Environmental and Experimental Botany Pub Date : 2024-09-26 DOI:10.1016/j.envexpbot.2024.105994

Wang Chunyuan , Yu Minghan , Ding Guodong , Quan Zhanjun , Zhang Linlin , Zheng Zhirong , Liu Bo , Diao Zhaoyan

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Abstract

Global climate change has led to the frequent occurrence of intense drought events in mid-latitude desert ecosystems, coupled with uneven rainfall distribution across phenophases within the year. However, the impact of intense drought events at different phenophases on plant growth and drought resistance strategies still lacks clear conclusions. We selected the typical desert semi-shrubs Artemisia ordosica as our research object, and constructed a rain shelter to simulate intense drought events (without rainfall for 30 consecutive days) during the sprouting, vegetative growth, flowering and fruiting stages. Based on this, we analyzed the differential impacts of intense drought events at different phenophases on the phenotypic characteristics (e.g. shrub height, cover, volume, specific leaf area) and functional traits (ANPP accumulation and allocation) of A. ordosica. The experiment employed a randomized complete block design with three replicates for each treatment. The results indicate that: (1) Under intense drought events at different phenophases, all phenotypic characteristic indicators of A. ordosica significantly decreased. (2) Contrary to the significant negative correlation between twig number and twig size in response to rainfall variations, under intense drought conditions, there is a significant positive correlation between the two, indicating a synergistic effect. (3) The impact of intense drought events at different phenophases on the ANPP (aboveground net primary production) accumulation of A. ordosica varied significantly. The degree of impact is as follows: the flowering and fruiting stage > the sprouting stage > the vegetative growth stage. (4) A. ordosica adapted to intense drought by increasing the proportion of reproductive growth and decreasing the proportion of vegetative growth. Our results reveal the phenotypic and functional trait plasticity response mechanisms of A. ordosica to intense droughts at different phenophases, laying a foundation for predicting the impacts of climate change on desert ecosystems.

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气候变化背景下沙漠灌木在不同物候期对强干旱事件的可塑性响应

全球气候变化导致中纬度沙漠生态系统频繁发生强干旱事件，同时年内不同物候期的降雨量分布不均。然而，不同物候期的强干旱事件对植物生长和抗旱策略的影响仍缺乏明确结论。我们选择了典型的荒漠半灌木蒿草作为研究对象，搭建了一个避雨棚，模拟了萌芽期、植株生长期、开花期和结果期的强干旱事件（连续 30 天无降雨）。在此基础上，我们分析了不同物候期强干旱事件对A. ordosica表型特征（如灌木高度、覆盖度、体积、比叶面积）和功能性状（ANPP积累和分配）的不同影响。试验采用随机完全区组设计，每个处理设三个重复。结果表明(1) 在不同物候期的强干旱事件下，A. ordosica 的所有表型特征指标均显著下降。(2）与小枝数量和小枝大小对降雨量变化的显著负相关相反，在强干旱条件下，二者之间存在显著的正相关，表明存在协同效应。(3）不同物候期的强干旱事件对 A. ordosica 的 ANPP（地上净初级生产力）积累的影响差异显著。影响程度分别为：开花结果期；萌芽期；营养生长期。(4）A. ordosica 通过增加生殖生长的比例和减少营养生长的比例来适应强干旱。我们的研究结果揭示了A. ordosica在不同物候期对强干旱的表型和功能性状可塑性响应机制，为预测气候变化对荒漠生态系统的影响奠定了基础。

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来源期刊

Environmental and Experimental Botany 环境科学-环境科学

CiteScore

9.30

自引率

5.30%

发文量

342

审稿时长

26 days

期刊介绍： Environmental and Experimental Botany (EEB) publishes research papers on the physical, chemical, biological, molecular mechanisms and processes involved in the responses of plants to their environment. In addition to research papers, the journal includes review articles. Submission is in agreement with the Editors-in-Chief. The Journal also publishes special issues which are built by invited guest editors and are related to the main themes of EEB. The areas covered by the Journal include: (1) Responses of plants to heavy metals and pollutants (2) Plant/water interactions (salinity, drought, flooding) (3) Responses of plants to radiations ranging from UV-B to infrared (4) Plant/atmosphere relations (ozone, CO2 , temperature) (5) Global change impacts on plant ecophysiology (6) Biotic interactions involving environmental factors.