Pepe Maria, Gratani Loretta, Crescente Maria Fiore, Puglielli Giacomo, Varone Laura
Department of Environmental Biology, Sapienza University of Rome, Rome, Italy.
Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Tartu, Estonia.
Front Plant Sci. 2022 Mar 25;13:837449. doi: 10.3389/fpls.2022.837449. eCollection 2022.
A greater relative growth rate (RGR) is positively correlated with a species' ability to deploy a larger leaf area either due to a greater total number of leaves (LN) in the canopy or due to an average size of individual leaves (LA). This study aimed to analyze and compare, (1) the temporal (i.e., daily) RGR, leaf production rate (LPR), and leaf area production rate (LAPR) changes during the early growth stages of three among the most invasive species in the world, namely, , , and . (2) the interspecific differences in the relationship between RGR, LPR, LAPR, and mean daily air temperature. Our results show that growth dynamics as a function of temperature differ between invasive alien species (IAS). While these differences are partly explained by differences due to the growth form of the investigated species, the three IAS have a different behavior to adjust RGR, LPR, and LAPR with air temperature changes even within the same growth form, and in agreement with species habitat requirements in their native range. In conclusion, the results help disentangle the relative role of RGR, LPR, and LAPR in defining non-native species growth responses to mean daily air temperature also in relation to a species' growth form.
较高的相对生长速率（RGR）与物种通过增加冠层叶片总数（LN）或增大单叶平均面积（LA）来拓展更大叶面积的能力呈正相关。本研究旨在分析和比较：（1）世界上三种最具入侵性的物种在早期生长阶段的时间（即每日）相对生长速率（RGR）、叶片产生速率（LPR）和叶面积产生速率（LAPR）的变化。（2）相对生长速率（RGR）、叶片产生速率（LPR）、叶面积产生速率（LAPR）与日平均气温之间关系的种间差异。我们的结果表明，外来入侵物种（IAS）的生长动态随温度的变化而不同。虽然这些差异部分可由所研究物种生长形式的差异来解释，但即使在相同生长形式下，这三种外来入侵物种在通过气温变化调整相对生长速率（RGR）、叶片产生速率（LPR）和叶面积产生速率（LAPR）方面也表现出不同行为，且这与它们在原生范围内的物种栖息地要求一致。总之，这些结果有助于厘清相对生长速率（RGR）、叶片产生速率（LPR）和叶面积产生速率（LAPR）在界定非本地物种对日平均气温的生长响应中所起的相对作用，同时也涉及物种的生长形式。
