| 引用本文: | 盘远方, 苏治南, 邱思婷, 邱广龙.华南沿海贝克喜盐草种子库与有性繁殖的时空格局及其关系[J].广西植物,2025,45(1):69-79.[点击复制] |
| PAN Yuanfang, SU Zhinan, QIU Siting, QIU Guanglong.Temporal and spatial pattern and their relationship between the seed bank and sexual reproduction of Halophila beccarii along the coasts of South China[J].Guihaia,2025,45(1):69-79.[点击复制] |
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| 华南沿海贝克喜盐草种子库与有性繁殖的时空格局及其关系 |
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盘远方1,2, 苏治南1,2, 邱思婷1,2, 邱广龙1,2*
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1. 广西海洋科学院(广西红树林研究中心), 广西红树林保护与利用重点实验室, 广西 北海 536000;2. 自然资源部北部湾滨海湿地生态系统野外科学观测研究站, 广西 北海 536015
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| 摘要: |
| 贝克喜盐草(Halophila beccarii)是全球具有灭绝风险的海草种类之一,被世界自然保护联盟(IUCN)列为易危(VL)种。为深入了解华南沿海贝克喜盐草海草床土壤种子库与有性繁殖时空分布特征,以期为贝克喜盐草这一濒危物种的保护、管理及恢复提供科学依据,该研究以华南沿海贝克喜盐草为研究对象,研究各采样点雄花、雌花和土壤种子库密度的时空变化特征及其相互关系。结果表明:(1)雄花密度和雌花密度主要表现为义丰溪和诏安较高,其他地方较低; 雄花密度和雌花密度随季节变化较大,总体表现为春季或秋季较高。(2)土壤种子库密度表现为花场湾最高,其次是洋浦,其他地方较低; 各采样点土壤种子库密度随季节变化具有较高异质性。(3)线性回归结果表明,贝克喜盐草土壤种子库密度与雄花密度呈显著负相关(P<0.05),与雌花密度相关性不显著(P>0.05)。(4)结构方程模型结果表明,季节变化是影响贝克喜盐草土壤种子库密度最关键的因素且季节变化对贝克喜盐草土壤种子库密度影响的直接效应(0.16)大于间接效应(0.008)。研究结果对深入理解贝克喜盐草种群的建立、更新和繁殖机制具有重要意义。 |
| 关键词: 海草, 贝克喜盐草, 土壤种子库密度, 雄花密度, 雌花密度, 结构方程模型 |
| DOI：10.11931/guihaia.gxzw202405002 |
| 分类号:Q948 |
| 文章编号:1000-3142(2025)01-0069-11 |
| 基金项目:国家自然科学基金(32170399); 自治区直属公益性科研院所基本科研业务费项目(2022GMRC-01,2022GMRC-02); 广西科学院改革发展专项项目(2024YGFZ504-102)。 |
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| Temporal and spatial pattern and their relationship between the seed bank and sexual reproduction of Halophila beccarii along the coasts of South China |
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PAN Yuanfang1,2, SU Zhinan1,2, QIU Siting1,2, QIU Guanglong1,2*
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1. Guangxi Key Lab of Mangrove Conservation and Utilization, Guangxi Academy of Marine Sciences(Guangxi Mangrove
Research Center), Beihai 536000, Guangxi, China;2. 2. Observation and Research Station of Coastal Wetland
Ecosystem in Beibu Gulf, Ministry of Natural Resources, Beihai 536015, Guangxi, China
1. Guangxi Key Lab of Mangrove Conservation and Utilization, Guangxi Academy of Marine Sciences(Guangxi Mangrove
Research Center)
, Beihai 536000, Guangxi, China; 2. Observation and Research Station of Coastal Wetland
Ecosystem in Beibu Gulf, Ministry of Natural Resources, Beihai 536015, Guangxi, China
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| Abstract: |
| Halophila beccarii is one of the sea grass species with a global risk of extinction and is listed as a vulnerable(VL)species by the International Union for Conservation of Nature(IUCN). To provide scientific evidence for the conservation, management, and restoration of the threatening seagrass H. beccarii, the temporal and spatial distribution pattern and their relationship between the soil seed bank and the sexual reproduction(male and female flowers density)of H. beccarii along the coasts of South China were studied. The results were as follows:(1)There were significant differences in densities of the male flower and the female flower between the sampling sites, with notably higher densities at Yifengxi and Zhao'an than other sites. And these monitored parameters exhibited marked seasonal fluctuations, with a peak in spring or autumn.(2)The highest soil seed bank density was observed at Huachangwan, followed by Yangpu, while relatively low densities were investigated at other sites. Moreover, soil seed bank densities exhibited considerable heterogeneity and seasonal changes across all sites.(3)Linear regression analysis results revealed a significant negative correlation between soil seed bank density and male flower density(P<0.05), while the correlation with female flower density was not significant(P>0.05).(4)Seasonal change was the primary factor influencing soil seed bank density in H. beccarii based on the results of the structural equation modeling(SEM). The direct effect of seasonal changes on soil seed bank density(0.16)was greater than the indirect effects(0.008). This research is of great significance for a deeper understanding of the establishment, renewal, and reproductive mechanisms of the H. beccarii population. |
| Key words: seagrass, Halophila beccarii, soil seed bank density, male flower density, female flower density, structural equation modeling(SEM) |
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