香茅草顺利向潮间带边缘入侵的机会之窗：水动力干扰对幼苗生长的重要性。,Journal of Environmental Management

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香茅草顺利向潮间带边缘入侵的机会之窗：水动力干扰对幼苗生长的重要性。
Journal of Environmental Management ( IF 8.0 ) Pub Date : 2020-04-17 , DOI: 10.1016/j.jenvman.2020.110559
Zhonghua Ning ₁ , Cong Chen ₂ , Tian Xie ₁ , Qing Wang ₂ , Junhong Bai ₁ , Dongdong Shao ₁ , Ying Man ₁ , Baoshan Cui ₁

Affiliation

尽管人们越来越担心草cord（S。alterniflora）扩张的全球威胁以及对其入侵机制的兴趣，但是，人们对草and入侵与地貌结构（如潮汐通道）之间相互作用的机理尚无一个普遍的了解。这项研究阐明了潮汐通道的水动力干扰对两种不同类型的潮汐通道（即主要潮汐通道和次要支流）边缘的草草初始幼苗建立的影响。我们进行了现场试验，在现场控制水动力条件下，将草草幼苗移植到上述潮汐通道的边缘。结果表明，主要潮汐通道（即 MMC不利于草皮草入侵，而低HDI通过促进草皮草幼苗的存活，生长和稳定性，为草皮草入侵次要支流（即MST）的边缘创造了机会之窗。高HDI的存在主要降低了禾本科草的成活率和总生物量，而禾本科草的根系生物量分配却显着增加，从而抵抗了脱落和倒塌。此外，现场调查表明，潮汐通道边缘的土壤盐分和水分不是限制草草幼苗生长的限制因素。然而，较高的繁殖压力与合适的土壤盐分-水分条件（即低盐分和高水分）相结合，为有利于苗木的建立奠定了坚实的基础。

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Windows of opportunity for smooth cordgrass landward invasion to tidal channel margins: The importance of hydrodynamic disturbance to seedling establishment.

Despite increasing concerns about the global threat of cordgrass (S. alterniflora) expansion and the interest in its invasion mechanisms, there is not yet a general understanding of the mechanistic processes underlying the interaction between cordgrass invasion and geomorphic structures such as tidal channels. This study elucidated the effects of the hydrodynamic disturbance of tidal channels on initial seedling establishment of cordgrass in the margins of two different types of tidal channels (i.e., main tidal channels and secondary tributaries). We performed field experiments that transplanted cordgrass seedlings to above-mentioned tidal channel margins with on-site controlled hydrodynamic conditions. The results showed that high hydrodynamic disturbance intensity (i.e., HDI) on the margin of main tidal channels (i.e., MMC) was not beneficial to cordgrass invasion, whereas low HDI created windows of opportunity for cordgrass invasion to the margin of secondary tributaries (i.e., MST) by facilitating the survival, growth, and stability of cordgrass seedlings. The presence of high HDI predominantly reduced the seedling survival and total biomass of cordgrass, whereas root biomass allocation of cordgrass increased significantly to resist dislodgment and toppling. Moreover, field investigations showed that soil salinity and moisture in the margin of tidal channels were not the limiting factors affecting the establishment of cordgrass seedlings. However, higher propagule pressure combined with suitable soil salinity-moisture conditions (i.e., low salinity and high moisture) laid a firm foundation favoring seedling establishment. Our results highlight the importance of hydrodynamic disturbance as a dominating driver regulating seedling establishment of cordgrass in tidal channel margins and the potential implications for controlling cordgrass landward invasions.

更新日期：2020-04-20

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