Interspecific competition alters carbon investment responses of Bolboschoenus planiculmis to nitrogen enrichment from agricultural drainage

作者：Yu Cong, Yu Zhu, Ming JIANG, Bo Liu, Yu An, Yuhong Li, Lei Wang, Shengjie Ba, Hongchao Sun, Mai–He Li, Wen J. Wang · 发表于：Ecotoxicology and Environmental Safety · 年份：2026 · DOI：10.1016/j.ecoenv.2026.120156 · 被引用次数：1 · 研究领域：Freshwater macroinvertebrate diversity and ecology、Aquatic Ecosystems and Phytoplankton Dynamics、Soil and Water Nutrient Dynamics

Agricultural drainage carrying significant amounts of nitrogen (N) from agricultural applications poses a significant threat to plant growth, composition, and structure in wetland ecosystems. However, how interspecific competition influences plants' responses to agricultural drainage-induced N enrichment has not yet been fully understood. We grew Bolboschoenus planiculmis, a key food source for the Siberian Crane (Grus leucogeranus) at stopover wetlands in northern China, with either Suaeda glauca or Phragmites australis across five mixture ratios under N enrichment (0 g vs. 0.5 g N per 10 kg soil). We investigated the relative competitiveness of B. planiculmis and determined non-structural carbohydrates (NSC), nitrogen (N), and phosphorus (P) concentrations in aboveground and belowground tissues. We observed that N enrichment, compared to the absence of N-addition, enhanced the competitive ability of B. planiculmis when grown with P. australis but reduced it when co-cultivated with S. glauca. N enrichment also decreased NSC concentrations in aboveground tissues and P concentrations in belowground tissues of B. planiculmis. Moreover, under N enrichment, the root:shoot (R/S) NSC ratio of B. planiculmis significantly increased when co-grown with S. glauca, whereas co-cultivation with P. australis resulted in an approximately two-fold higher R/S NSC ratio than when grown with S. glauca. Additionally, NSC concentrations decreased in the aboveground tissues of B. planiculmis with ...