Invasive plant indirectly affects its self-expansion and native species via bio-geomorphic feedbacks: Implications for salt marsh restoration
Invasive plant indirectly affects its self-expansion and native species via bio-geomorphic feedbacks: Implications for salt marsh restoration
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DOI：
10.1016/j.catena.2023.107056
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发表时间：
2023-06
期刊：
影响因子：
6.2
通讯作者：
Z. Ning;Cong Chen;T. Xie;Shanze Li;Zhenchang Zhu;Qing Wang;Yan-peng Cai;J. Bai;B. Cui
中科院分区：
文献类型：
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作者：
Z. Ning;Cong Chen;T. Xie;Shanze Li;Zhenchang Zhu;Qing Wang;Yan-peng Cai;J. Bai;B. Cui
众所周知，入侵工程物种具有改变非生物和生物生态系统特征及相关生态过程的能力。然而，它们是否以及如何改变生物和物理过程之间的相互作用，即所谓的生物地貌反馈，可能间接影响它们的入侵和本地物种，尚未得到调查。本文以中国黄河三角洲互花米草入侵的潮汐河道-盐沼为模型系统，首先量化了入侵造成的生物地貌影响，然后考察了这种生物地貌变化对其自我扩张和本土优势种碱蓬生长的反馈作用。野外观察和实验表明，这种入侵。互花米草显著地促进了潮汐河道边缘扩张带内的沉积速率，导致了淹没条件增加的边缘洼地。改变的生物地貌过程极大地减少了原住民的生存和生长，而对自然生态系统的影响。互作苗木的生长依赖于阈值。苗木的建苗、生长和无性伸展。当这些凹陷的淹没深度落在一个门槛内(大约15厘米)时，就有利于交替开花。相反，当淹水深度超过阈值时，就会出现与淹水相关的胁迫并抑制其生长表现。因此，是侵略者。在可预见的未来，可以促进替代植物向盐沼横向扩张，同时抑制原住民的增长范围。我们的发现表明，物种入侵对现有的生物地貌反馈环有很大贡献，导致对种群动态的观察到的影响，这些影响应该被整合到经历了入侵诱导的地貌变形的盐沼的恢复中。
Invasive engineering species are well-known to have the capacity to alter abiotic and biotic ecosystem characteristics and associated ecological processes. However, it has not been investigated whether and how they can alter reciprocal interactions between biological and physical processes, known as bio-geomorphic feedbacks, which may indirectly influence their invasion and native species. Here, using a tidal channel-salt marsh invaded bySpartina alterniflorain the Yellow River Delta of China as a model system, we first quantified the bio-geomorphic impacts caused by the invasion and subsequently examined the feedbacks of such altered bio-geomorphic impacts on its self-expansion and the growth of native dominants -Suaeda salsa. Field observations and experiments showed that invadedS. alterniflorasignificantly promoted the sedimentation rate within its expansion belt along tidal channel margins, resulting in marginal depressions with increased inundation conditions. The altered bio-geomorphic processes considerably reduced the survival and growth of natives, while the impacts onS. alternifloraseedlings were threshold-dependent. Seedling establishment, growth and asexual expansion ofS. alterniflorawere facilitated when the inundation depth of these depressions fell within a threshold (approximately < 15 cm). In contrast, as the inundation depth exceeded the threshold, inundation-related stress occurred and inhibited its growth performance. As such, invasiveS. alternifloracould be facilitated to expand laterally into salt marshes while suppressing the growth range of natives for the foreseeable future. Our findings suggest that species invasions contribute substantially to existing bio-geomorphic feedback loops, leading to observed effects on population dynamics that should be integrated into the restoration of salt marshes that have undergone invasion-induced geomorphological metamorphosis.