Key Laboratory of Agro-ecological Processes in Subtropical Region, The Chinese Academy of Sciences, Hunan 410125, China.
Dongting Lake Station for Wetland Ecosystem Research, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha 410125, China.
Sci Rep. 2017 Jan 5;7:39963. doi: 10.1038/srep39963.
Sediment accretion (burial) and nutrient enrichment occur concurrently in lacustrine wetlands, but the role of these two aspects of sedimentation on macrophyte performance has rarely been examined. Here, we investigated the concurrent effects of sediment accretion and nutrient enrichment on the growth and propagation of Phalaris arundinacea L. using a factorial sediment burial by nutrient addition experimental design. Regardless of burial depth, nutrient addition increased biomass accumulation, shoot mass ratio, the number of rhizomes, and the length of ramets and rhizomes. While burial had little effect on plant growth and propagation, it had an interactive effect with nutrient addition on belowground growth and ramet production. These results indicate that P. arundinacea is tolerant to burial, which allows it to grow in habitats with high sedimentation rates. However, the enhanced growth and propagation of P. arundinacea following sedimentation were primarily related to nutrient enrichment. This suggests that nutrient enrichment of sediments, which occurs in many lacustrine wetlands, increases the risk of invasion by P. arundinacea.
在湖泊湿地中，泥沙淤积（掩埋）和养分富集会同时发生，但这两个沉降方面对大型植物性能的影响很少被研究。在这里，我们使用通过养分添加的因子沉降掩埋实验设计，研究了泥沙淤积和养分富集会对菵草生长和繁殖的并发影响。无论掩埋深度如何，养分添加都会增加生物量积累、茎质量比、根茎数量以及分株和根茎的长度。尽管掩埋对植物生长和繁殖的影响不大，但它与养分添加对地下生长和分株产生了交互作用。这些结果表明，菵草能够耐受掩埋，这使其能够在高泥沙淤积率的生境中生长。然而，沉降后菵草的生长和繁殖增强主要与养分富集有关。这表明，许多湖泊湿地中发生的沉积物养分富集会增加菵草入侵的风险。
