Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, China.
PLoS One. 2013 Dec 18;8(12):e84657. doi: 10.1371/journal.pone.0084657. eCollection 2013.
The perennial stoloniferous herbaceous vine Mikania micrantha H.B.K. is among the most noxious exotic invaders in China and the world. Disturbance can fragment stolons of M. micrantha and disperse these fragments over long distances or bury them in soils at different depths. To test their regeneration capacity, single-node stolon fragments with stolon internode lengths of 0, 3, 6 and 12 cm were buried in soil at 0, 2, 5 and 8 cm depths, respectively. The fragments were growing for nine weeks, and their emergence status, growth and morphological traits were measured. The results indicated that increasing burial depth significantly decreased survival rate and increased the emergence time of the M. micrantha plants. At an 8-cm burial depth, very few fragments (2.19%) emerged and survived. Burial did not affect the total biomass and root to shoot ratio of the surviving M. micrantha plants that emerged from the 0- and 2-cm burial depths. Increasing internode length significantly increased survival rate and growth measures, but there was no interaction effect with burial depth for any traits measured. These results suggest that M. micrantha can regenerate from buried stolon fragments, and thus, disturbance may contribute to the spread of this exotic invader. Any human activities producing stolon fragments or facilitating dispersal should be avoided.
多年生匍匐状草本藤本植物微甘菊（Mikania micrantha H.B.K.）是中国乃至全球最具危害性的外来入侵物种之一。干扰可以将微甘菊的匍匐茎片段破碎，并将这些片段远距离散布或埋在不同深度的土壤中。为了测试其再生能力，将具有 0、3、6 和 12cm 匍匐节间长度的单节匍匐茎片段分别埋入 0、2、5 和 8cm 深的土壤中。片段生长了九周，测量了它们的出芽状态、生长和形态特征。结果表明，随着埋藏深度的增加，微甘菊的存活率显著降低，出芽时间延长。在 8cm 的埋藏深度下，很少有片段（2.19%）出芽并存活。埋藏深度不影响从 0 和 2cm 埋藏深度出芽的存活微甘菊植物的总生物量和根冠比。节间长度的增加显著提高了存活率和生长指标，但对任何测量的性状都没有与埋藏深度的交互作用。这些结果表明，微甘菊可以从埋藏的匍匐茎片段中再生，因此，干扰可能有助于这种外来入侵物种的传播。应避免任何产生匍匐茎片段或促进传播的人类活动。
