Wu Hao, Zhang San-Yu, Ji Qiu-Bo, Wang Wen-Hao, Xiao Nan-Nan, Zhang Le-Hui
College of Life Sciences, Xinyang Normal University, Xinyang 464000, Henan, China.
Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China.
Ying Yong Sheng Tai Xue Bao. 2022 Jan;33(1):85-96. doi: 10.13287/j.1001-9332.202201.002.
Species coexistence depends on the comprehensive effects of biological properties and habitat heterogeneity. Based on a large-scale field survey (21°-35° N), we compared the differences on morphological and stoichiometric characteristics between the invasive aquatic species and the native co-occurring species , and examined the effects of environmental factors on such differences. The results showed that the coverage and importance value (IV) of . were all significantly greater than . (34.3% and 104.0%, respectively), whereas the height of . was significantly greater than . (13.8%). Moreover, the total nitrogen concentration (TN) and N:P of . were significantly greater than those of . (55.1% and 55.8%, respectively), whereas the total carbon concentration (TC) and C:N of . were significantly greater than those of . (4.1% and 83.8%, respectively). . coverage increased with the increases of longitude, and its abundance increased with the increases of water nitrate concentration and longitude, while its IV increased with the increases of water ammonium concentration. However, the coverage, abundance, and IV of . decreased with the increases of ammonium concentration. C:N of . decreased with the increase of ammonium concentration. Increased mean annual temperature and mean annual precipitation increased C:N but decreased N:P of . The C:P of both species decreased with the increases of ammonium concentration and electrical conductivity. N:P of . was little affected by environment. These results indicated that . had greater coverage and N absorption capacity than . , and that enriched water nitrogen would aggravate the invasion of . Meanwhile, . improved its C-assimilate reserves and chose the growth competition strategy for resisting . invasion under the superior hydrothermal conditions. Different responses to environmental changes contributed to their coexistence in aquatic ecosystem.
物种共存取决于生物特性和栖息地异质性的综合影响。基于一项大规模的实地调查（北纬21° - 35°），我们比较了入侵水生物种与同域分布的本地物种在形态和化学计量特征上的差异，并研究了环境因素对这些差异的影响。结果表明，[物种名称1]的盖度和重要值（IV）均显著大于[物种名称2]（分别为34.3%和104.0%），而[物种名称1]的高度显著大于[物种名称2]（13.8%）。此外，[物种名称1]的总氮浓度（TN）和N:P显著大于[物种名称2]（分别为55.1%和55.8%），而[物种名称1]的总碳浓度（TC）和C:N显著大于[物种名称2]（分别为4.1%和83.8%）。[物种名称1]的盖度随经度增加而增加，其多度随水体硝酸盐浓度和经度增加而增加，而其重要值随水体铵浓度增加而增加。然而，[物种名称2]的盖度、多度和重要值随铵浓度增加而降低。[物种名称2]的C:N随铵浓度增加而降低。年平均温度和年平均降水量增加会使[物种名称1]的C:N增加但N:P降低。两个物种的C:P均随铵浓度和电导率增加而降低。[物种名称2]的N:P受环境影响较小。这些结果表明，[物种名称1]比[物种名称2]具有更大的盖度和氮吸收能力，富氮水体将加剧[物种名称1]的入侵。同时，[物种名称2]在优越的水热条件下提高了其碳同化储备，并选择了生长竞争策略来抵御[物种名称1]的入侵。对环境变化的不同响应促成了它们在水生生态系统中的共存。
