Guo Xiao, Sun Zhihang, Gao Yufei, Zhang Haijie, Wang Qiang, Guo Xianhu, Li Mingyan, Liu Lele, Lu Jiaao, Guo Shaoxia, Li Shimei, Guo Weihua
College of Landscape Architecture and Forestry, Qingdao Agricultural University, No. 700 Changcheng Road, Qingdao, 266109, China; Shandong Key Laboratory for Germplasm Innovation of Saline-alkaline Tolerant Grasses and Trees, Qingdao Agricultural University, Qingdao, 266109, China.
College of Landscape Architecture and Forestry, Qingdao Agricultural University, No. 700 Changcheng Road, Qingdao, 266109, China; Shandong Key Laboratory for Germplasm Innovation of Saline-alkaline Tolerant Grasses and Trees, Qingdao Agricultural University, Qingdao, 266109, China.
J Environ Manage. 2025 Jun;384:125506. doi: 10.1016/j.jenvman.2025.125506. Epub 2025 Apr 27.
Biological invasions present a global environmental challenge, the competitive interactions between native and invasive species constitute a crucial factor in determining the success of invasions. Past research has often treated native species as a monolithic entity when conducting competition experiments with invasive species. In truth, different genotypes may possess substantial differences in functional traits and competitive abilities. Few studies have subdivided widespread native species into distinct subgroups to conduct competitive experiments with invasive species. The invasive Spartina alterniflora and the widespread native Phragmites australis coexist extensively along the coastal regions of China. Through field sample collection and greenhouse common garden experiments, we investigated the salinity tolerance of two common haplotypes of P. australis (haplotype O and haplotype P) in the Yellow River Delta, as well as their relative competitive ability against the invasive S. alterniflora across varying salinity levels. The results showed that under high salinity without competition, the biomass of haplotype O decreased by 46.89 % (haplotype P: 40.0 %), while under low salinity with competition, it decreased by 17.7 % (haplotype P: 25.8 %). The competitive dominance of both haplotypes against S. alterniflora gradually diminished as salinity increased, disappearing under high salinity conditions. Haplotype O exhibited a competitive dominance over S. alterniflora under control and low-salinity stress, whereas haplotype P only showed competitive dominance under control conditions. Our study demonstrates that different genotypes of native species possess varying resistance to invasive species, a consideration that is critical in the practice of using native species for biotic substitution to control invasions.
生物入侵是一项全球性的环境挑战，本地物种与入侵物种之间的竞争相互作用是决定入侵成功与否的关键因素。过去的研究在与入侵物种进行竞争实验时，常常将本地物种视为一个整体。事实上，不同的基因型在功能性状和竞争能力上可能存在显著差异。很少有研究将分布广泛的本地物种细分为不同的亚组，以便与入侵物种进行竞争实验。入侵物种互花米草与分布广泛的本地物种芦苇在中国沿海地区广泛共存。通过野外样本采集和温室共同花园实验，我们研究了黄河三角洲芦苇两种常见单倍型（单倍型O和单倍型P）的耐盐性，以及它们在不同盐度水平下对入侵互花米草的相对竞争能力。结果表明，在无竞争的高盐度条件下，单倍型O的生物量下降了46.89%（单倍型P：40.0%），而在有竞争的低盐度条件下，生物量下降了17.7%（单倍型P：25.8%）。随着盐度的增加，两种单倍型对互花米草的竞争优势逐渐减弱，在高盐度条件下消失。单倍型O在对照和低盐度胁迫下对互花米草表现出竞争优势，而单倍型P仅在对照条件下表现出竞争优势。我们的研究表明，本地物种的不同基因型对入侵物种具有不同的抗性，这一考虑在利用本地物种进行生物替代以控制入侵的实践中至关重要。
