黄河三角洲资源植物种子持久性对潜水水文条件变化的响应

doi:10.3976/j.issn.1002-4026.20240132

摘要/Abstract

摘要：

海平面上升和人为活动显著改变滨海湿地潜水水文条件。针对植物种子持久性如何响应潜水水文条件变化的问题,以黄河三角洲湿地芦苇(Phragmites australis)、盐地碱蓬(Suaeda salsa)、灰绿藜(Chenopodium glaucum)和鹅绒藤(Cynanchum chinense)4种资源植物种子为实验材料,通过室内模拟方法,基于平均萌发时间、萌发力指数和生活力指数3个指标,研究在湿润和淹水2种潜水水位、4个潜水盐度梯度以及干燥条件下的种子持久性差异。结果显示,3个指标评估种子持久性基本具有一致性。不同植物种子持久性对潜水水位和潜水盐度的响应并不完全相同。干燥和淹水生境的种子持久性均优于湿润生境,其中,芦苇、盐地碱蓬和灰绿藜种子在淹水生境的持久性显著优于湿润生境(P<0.05)。潜水盐度对种子持久性的影响随潜水水位变化而变化,湿润生境下,基于萌发力指数和生活力指数,盐地碱蓬、灰绿藜和鹅绒藤种子持久性随潜水盐度升高而增强,但淹水生境下不存在上述变化趋势。该研究将为黄河三角洲湿地退化植被恢复提供理论依据。

关键词: 黄河三角洲, 资源植物, 海平面上升, 潜水水位, 潜水盐度

Abstract:

Sea level rise and anthropogenic activities significantly affect the hydrological conditions of shallow groundwater in coastal wetlands. It is unclear how seed persistence responds to changes in the hydrological conditions of shallow groundwater. Seeds from four wild-resource plant species, Phragmites australis, Suaeda salsa, Chenopodium glaucum, and Cynanchum chinense, from coastal areas of the Yellow River Delta were selected for the study. Using indoor simulation methods, we investigated differences in seed persistence at two shallow groundwater levels (moist and saturated habitats), four gradients of shallow groundwater salinity, and under dry conditions based on mean germination time, germinability index, and viability index. Overall, mean germination time, seed germinability index, and viability index were consistent in evaluating seed persistence. The response trends of seed persistence of different plants to shallow groundwater level and salinity were different. Seed persistence was stronger in dry and saturated habitats than in moist habitats. Compared with storage in moist habitats, the seed persistence of P. australis, S. salsa, and C. glaucum was significantly stronger in saturated habitats (P<0.05). The effects of shallow groundwater salinity on seed persistence varied with changes in shallow groundwater level. In moist habitats, based on germinability index and viability index, seed persistence of S. salsa, C. glaucum, and C. chinense increased with the increase in shallow groundwater salinity. However, these trends did not exist when the seeds were in saturated habitats. The results will provide a scientific basis for the protection of resources in the degraded wetlands of the Yellow River Delta.

Key words: Yellow River Delta, resource plants, sea level rise, shallow groundwater level, shallow groundwater salinity

中图分类号:

Q948.1

冯璐, 李丽杰, 薛琦, 孙雨, 王祺, 贾慧, 孙林. 黄河三角洲资源植物种子持久性对潜水水文条件变化的响应[J]. 山东科学, 2025, 38(2): 62-72.

FENG Lu, LI Lijie, XUE Qi, SUN Yu, WANG Qi, JIA Hui, SUN Lin. Response of seed persistence of resource plants to shallow groundwater hydrological conditions in the Yellow River Delta[J]. Shandong Science, 2025, 38(2): 62-72.

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