Interactions between artificial light at night, soil moisture, and plant density affect the growth of a perennial wildflower
Interactions between artificial light at night, soil moisture, and plant density affect the growth of a perennial wildflower
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DOI：
10.1007/s00442-020-04679-9
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发表时间：
2020-06-12
期刊：
影响因子：
2.7
通讯作者：
Haynes, Kyle J.
中科院分区：
文献类型：
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作者：
Hey, Melissa H.;DiBiase, Elizabeth;Haynes, Kyle J.
夜间人工光照(Alan)已经被证明可以改变植物生长的各个方面，但我们还没有发现任何研究考察了Alan对植物的影响是否取决于植物在田间种群中遇到的其他非生物因素的变化背景。我们进行了一项田间试验，以研究阿兰是否影响马尾松的生长和抗草食防御，以及阿兰的效果是否受种植密度或土壤水分的影响。夜间人工光照、土壤水分和种植密度均按裂区析因设计进行控制。尽管浇水增加土壤水分对胶乳渗出量没有显著影响，但植物生长的属性总体上对浇水有积极的反应。植株地径和株高受土壤水分交互作用的影响。对于这两个变量，艾伦的积极影响对没有浇水的植物比对浇水的植物更大。茎基径也受Alan×植株密度互作的影响，低密度处理的正向效应大于高密度处理。我们的结果表明，艾伦对植物生长的影响可以通过土壤水分和种植密度来改变。因此，艾伦对自然界植物的影响可能与现有的框架不一致，现有框架没有考虑关键的非生物变量，如水分可获得性或植物之间的生物相互作用，如竞争。
Artificial light at night (ALAN) has been shown to alter aspects of plant growth, but we are not aware of any studies that have examined whether the effects of ALAN on plants depend upon the backdrop of variation in other abiotic factors that plants encounter in field populations. We conducted a field experiment to investigate whether ALAN affects the growth and anti-herbivore defenses of common milkweed,Asclepias syriaca, and whether the effects of ALAN are influenced by plant density or soil moisture content. Artificial light at night, soil moisture, and plant density were manipulated according to a split-plot factorial design. Although increasing soil moisture by watering had no significant effects on latex exudation, attributes of plant growth generally responded positively to watering. The basal stem diameter (BSD) and height of plants were affected by ALAN x soil moisture interactions. For both of these variables, the positive effects of ALAN were greater for plants that were not watered than for plants that were. Basal stem diameter was also affected by an ALAN x plant density interaction, and the positive effect of ALAN on BSD was greater in the low-density treatment than in the high-density treatment. Our results demonstrate that the effects of ALAN on plant growth can be altered by soil moisture and plant density. Consequently, the effects of ALAN on plants in nature may not be consistent with existing frameworks that do not account for critical abiotic variables such as water availability or biotic interactions between plants such as competition.