School of Environmental Engineering, Nanjing Institute of Technology, Nanjing, China.
Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padova, Legnaro, PD, Italy.
Physiol Plant. 2024 Nov-Dec;176(6):e14634. doi: 10.1111/ppl.14634.
This study investigates how variations in diurnal temperature and phosphorus concentration affect the growth of native Artemisia argyi and invasive Solidago canadensis under intraspecific and interspecific competition. We conducted factorial experiments to assess the impacts of warming, including an increased diurnal temperature range (DTRinc), a symmetric increase in diurnal temperature range (DTRsys), a decreased diurnal temperature range (DTRdec) and phosphorus application (5 g and 10 g P m yr) on both intra- and inter-specific competition among plants. The results indicated that (1) the DTRsys for A. argyi was -48.95% and for S. canadensis, it was -31.49% and overall had a more pronounced inhibitory effect on the biomass of both plant species than other warming treatments after comprehensive analysis. (2) Under intraspecific competition, phosphorus promoted the growth of A. argyi and S. canadensis on plant height, root length, and biomass. The biomass of A. argyi (22.75% and 53.61%) and S. canadensis (11.49% and 27.76%) increased under low and high phosphorus, respectively. Under interspecific competition, the plant height and biomass of the two plant species showed different response trends to phosphorus. Still, the competitiveness of S. canadensis increased compared with the untreated group. (3) Plant adaptability in biomass was more sensitive to warming than phosphorus treatments, and warming reduced the promoting effect of phosphorus, indicating that warming and phosphorus have interactive effects on plants. Phosphorus exacerbated the inhibitory effect of DTRinc on the biomass of S. canadensis, which was more pronounced than other warming methods. The different responses of the two plants mention the species to warming and phosphorus treatments under different competition scenarios reflect the differences in their ecological strategies for adapting to the environment.
本研究调查了日温差和磷浓度的变化如何影响种内和种间竞争下本地艾蒿和入侵加拿大一枝黄花的生长。我们进行了因子实验，以评估变暖的影响，包括日温差范围增加（DTRinc）、日温差范围对称增加（DTRsys）、日温差范围减小（DTRdec）和磷应用（5 g 和 10 g P m yr）对植物种内和种间竞争的影响。结果表明：（1）艾蒿的 DTRsys 为-48.95%，加拿大一枝黄花的 DTRsys 为-31.49%，经过综合分析，与其他变暖处理相比，对两种植物生物量的抑制作用更为显著。（2）在种内竞争下，磷促进了艾蒿和加拿大一枝黄花的生长，表现在株高、根长和生物量上。艾蒿（22.75%和 53.61%）和加拿大一枝黄花（11.49%和 27.76%）在低磷和高磷条件下生物量均增加。在种间竞争下，两种植物的株高和生物量对磷的响应趋势不同，但加拿大一枝黄花的竞争力比未处理组有所增加。（3）植物对生物量的适应性对变暖比磷处理更为敏感，变暖降低了磷的促进作用，表明变暖与磷对植物有相互作用。磷加剧了 DTRinc 对加拿大一枝黄花生物量的抑制作用，比其他变暖方式更为明显。两种植物的不同响应表明，在不同的竞争情景下，物种对变暖与磷处理的反应反映了它们适应环境的生态策略的差异。
