Soil versus atmospheric drought: A test case of plant functional trait responses
Soil versus atmospheric drought: A test case of plant functional trait responses
复制标题
土壤与大气干旱：植物功能性状反应的测试案例
DOI：
10.1002/ecy.4109
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发表时间：
2023
期刊：
影响因子：
4.8
通讯作者：
Wright, Alexandra J.
中科院分区：
文献类型：
--
作者：
Watson, Samantha J.;Aguirre, Beatriz A.;Wright, Alexandra J.
气候变化改变了全球平均表面温度、降水状况和大气湿度。由此造成的干旱影响到全世界陆地生态系统的组成和多样性。到目前为止，还没有评估的综合影响，减少降水和大气干燥的功能性状分布的任何物种在室外实验。在这里，我们研究了土壤和大气干旱是否影响了在单一栽培中生长的焦点草种（早熟禾）的功能特征和室外围隔生态系统中的八种草群落。我们专注于比叶面积（SLA），叶面积，气孔密度，根冠比，细根：粗根比的反应。叶面积和整体增长减少与土壤干燥。根：冠比仅P增加。在大气干旱和土壤干旱的共同作用下，在单作中进行继代生长。植物能量分配策略（用主成分测量）不同时P。与土壤干旱单独相比，Secunda在土壤和大气干旱相结合的条件下生长。由于缺乏这种户外操作，我们的研究结果强调了大气干燥对功能性状反应的重要性。我们认为，干旱的方法，纯粹集中在土壤水分输入可能是不准确的预测干旱对其他陆生生物以及（其他植物，节肢动物，和更高的营养水平）的影响。
Climate change alters mean global surface temperatures, precipitation regimes, and atmospheric moisture. Resultant drought affects the composition and diversity of terrestrial ecosystems worldwide. To date, there have been no assessments of the combined impacts of reduced precipitation and atmospheric drying on functional trait distributions of any species in an outdoor experiment. Here, we examined whether soil and atmospheric drought affected the functional traits of a focal grass species (Poa secunda) growing in monoculture and eight‐species grass communities in outdoor mesocosms. We focused on specific leaf area (SLA), leaf area, stomatal density, root:shoot ratio, and fine root:coarse root ratio responses. Leaf area and overall growth were reduced with soil drying. Root:shoot ratio only increased forP. secundagrowing in monoculture under combined atmospheric and soil drought. Plant energy allocation strategy (measured using principal components) differed whenP. secundawas grown in combined soil and atmospheric drought conditions compared with soil drought alone. Given a lack of outdoor manipulations of this kind, our results emphasize the importance of atmospheric drying on functional trait responses more broadly. We suggest that drought methods focused purely on soil water inputs may be imprecisely predicting drought effects on other terrestrial organisms as well (other plants, arthropods, and higher trophic levels).