Yang Lili, Lou Yanjing, Tang Zhanhui
Key Laboratory of Wetland Ecology and Vegetation Restoration, Ministry of Ecology and Environment, Key Laboratory for Vegetation Ecology, Ministry of Education, School of Environment, Northeast Normal University, Changchun 130117, China.
Jilin Provincial Joint Key Laboratory of Changbai Mountain Wetland and Ecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China.
Plants (Basel). 2025 Jul 9;14(14):2112. doi: 10.3390/plants14142112.
Soil saline-alkaline stress and water stress, exacerbated by anthropogenic activities and climate change, are major drivers of wetland vegetation degradation, severely affecting the function of wetland ecosystems. In this study, we conducted a simulation experiment with three water levels and four saline-alkaline concentration levels as stress factors to assess eight key functional traits of and , dominant species in the salt marsh wetlands in the western region of Jilin province, China. The study aimed to evaluate how these factors influence the functional traits of and . Our results showed that the leaf area, root biomass, and clonal biomass of significantly increased, and the leaf area of significantly decreased under low and medium saline-alkaline concentration treatments, while the plant height, ramet number, and aboveground biomass of and the root biomass, clonal biomass, and clonal/belowground biomass ratio of were significantly reduced and the ratio of belowground to aboveground biomass of significantly increased under high saline-alkaline concentration treatment. The combination of drought conditions with medium and high saline-alkaline treatments significantly reduced leaf area, ramet number, and clonal biomass in both species. The interaction between flooding water level and medium and high saline-alkaline treatments significantly suppressed the plant height, root biomass, and aboveground biomass of both species, with the number of ramets having the greatest contribution. These findings suggest that the effects of water levels and saline-alkaline stress on the functional traits of and are species-specific, and the ramet number-plant height-root biomass (RHR) strategy may serve as an adaptive mechanism for wetland clones to environmental changes. This strategy could be useful for predicting plant productivity in saline-alkaline wetlands.
受人为活动和气候变化加剧影响的土壤盐碱胁迫和水分胁迫，是湿地植被退化的主要驱动因素，严重影响湿地生态系统功能。在本研究中，我们以三个水位和四个盐碱浓度水平作为胁迫因子进行了模拟实验，以评估中国吉林省西部盐沼湿地的优势物种碱蓬和芦苇的八个关键功能性状。该研究旨在评估这些因素如何影响碱蓬和芦苇的功能性状。我们的结果表明，在低、中盐碱浓度处理下，碱蓬的叶面积、根生物量和克隆生物量显著增加，芦苇的叶面积显著减小；而在高盐碱浓度处理下，碱蓬的株高、分株数和地上生物量以及芦苇的根生物量、克隆生物量和克隆/地下生物量比显著降低，碱蓬的地下/地上生物量比显著增加。干旱条件与中、高盐碱处理相结合显著降低了两种植物的叶面积、分株数和克隆生物量。淹水水位与中、高盐碱处理之间的相互作用显著抑制了两种植物的株高、根生物量和地上生物量，其中分株数的贡献最大。这些发现表明，水位和盐碱胁迫对碱蓬和芦苇功能性状的影响具有物种特异性，分株数-株高-根生物量（RHR）策略可能是湿地克隆植物适应环境变化的一种机制。该策略可能有助于预测盐碱湿地的植物生产力。
