Mangrove forests are critical ecosystems for carbon sequestration,effectively capturing atmospheric carbon and permanently storing soil organic carbon(SOC)in coastal wetlands.Recent restoration and afforestation initi...Mangrove forests are critical ecosystems for carbon sequestration,effectively capturing atmospheric carbon and permanently storing soil organic carbon(SOC)in coastal wetlands.Recent restoration and afforestation initiatives have been undertaken to mitigate the rising atmospheric CO_(2) concentrations along tropical ocean coasts worldwide.The expansion of mangrove forests has garnered significant attention for elucidating their contributions to the permanent storage of carbon in both surface and subsoil layers.In this study,we investigated a recently expanding mangrove forest in the Beilun River Estuary of Guangxi Province,focusing on the abundance and sources of organic carbon(OC)in surface sediments.We also analyzed sediment grain size distribution,SOC,total nitrogen(TN)content,and stable carbon isotope composition(δ^(13)C).Additionally,we determined the molar ratio of SOC to nitrogen(C/N).The SOC content ranged from 0.25%to 6.58%,the C/N ratio varied from 9.85 to 17.73,δ^(13)C values spanned from-29.58‰to-24.93‰,andδ^(15)N values ranged from 3.10‰to 7.36‰.A strong correlation was observed between SOC and TN content.However,particle size did not significantly influence these relationships.In terms of SOC sources in the sediments,contributions from mangrove,terrestrial,and marine sources accounted for 37.1%to 99.5%,0.5%to 47.4%,and 0%to 17.6%,respectively.The findings of this study provide essential insights for evaluating and managing carbon sinks within the mangrove ecosystems of the Beibu Gulf region,contributing to more effective carbon management strategies in coastal areas.展开更多
The paleoenvironmental history of the Beilun River estuary on the coast of Beibu Gulf in the northwest South China Sea is reconstructed based on fossil diatoms, isotopic dating, sedimentary grain size data, mineralogy...The paleoenvironmental history of the Beilun River estuary on the coast of Beibu Gulf in the northwest South China Sea is reconstructed based on fossil diatoms, isotopic dating, sedimentary grain size data, mineralogy and geochemistry in three sediment core samples. Results show that the estuary has experienced significant environmental changes since deposition began about 20,000 yr ago. Freshwater runoff of the Beilun River initially was strong. However, the freshwater runoff reduced significantly after a transgressive event. Subsequently the estuary’s position began to migrate to the northeast. At the end of the Late Pleistocene the estuary shifted gradually towards the southwest. In the Early-Mid Holocene, the estuary’s geomorphology was shaped by seawater transgressing into the ancient river channel. The basin was filled continuously but slowly to form the present Beilun River estuary. Holocene transgression in this area could be divided roughly into three stages, including oscillation period 1, the maximum transgression period, and oscillation period 2.展开更多
An investigation was carried out in wharves, inspection yards, processing plants in Beilun Port and the surrounding areas. Five kinds of exotic harmful weeds were discovered and collected, and they were described and ...An investigation was carried out in wharves, inspection yards, processing plants in Beilun Port and the surrounding areas. Five kinds of exotic harmful weeds were discovered and collected, and they were described and analyzed.展开更多
In the history, the main roles of inland rivers in Beilun Port City of Ningbo were desalination,blocking tides, shipping, and flood control. Nowadays, with the continuous spread and deepening ofurbanization, the ecolo...In the history, the main roles of inland rivers in Beilun Port City of Ningbo were desalination,blocking tides, shipping, and flood control. Nowadays, with the continuous spread and deepening ofurbanization, the ecological environment of river courses has been destroyed. In the past, remediationmeasures based on engineering and technology played a certain role, but can not “cure the root cause”. Itshould respect the historical evolution process of river courses, and highlight the ecological service functionand leisure tourism value of river courses from the coordination perspective of urban and rural ecologicalenvironment, economic industries, society and culture in the planning ideas of ecology, production, andlife integration. Four aspects of the measures are as below: protecting and repairing the ecological matrixof river courses;building green space system and maintaining flood control functions through the waternetwork;protecting cultural heritage along the rivers;developing waterfront leisure tourism scenic area.展开更多
The method for pest risk analysis was used to make the potential risk analysis and assessment to the 8 Bursaphelenchus species found in the pines in Yuyao, Ningbao, and the corresponding risk management strategies wer...The method for pest risk analysis was used to make the potential risk analysis and assessment to the 8 Bursaphelenchus species found in the pines in Yuyao, Ningbao, and the corresponding risk management strategies were put forward.展开更多
目的从红树林根际淤泥中分离鉴定放线菌并进行多样性分析及抗菌活性研究,为新抗生素的发现提供药用放线菌资源。方法用6种分离培养基,利用涂布平板法分离放线菌;通过PCR扩增获得菌株16S r RNA基因并进行同源性比对,分析放线菌多样性;发...目的从红树林根际淤泥中分离鉴定放线菌并进行多样性分析及抗菌活性研究,为新抗生素的发现提供药用放线菌资源。方法用6种分离培养基,利用涂布平板法分离放线菌;通过PCR扩增获得菌株16S r RNA基因并进行同源性比对,分析放线菌多样性;发酵液经处理分别形成发酵液酯相、发酵液水相和菌丝丙酮浸提液3类样品;纸片扩散法进行抗菌活性测试。结果从5份红树林植物根际淤泥样品中分离纯化得到56株放线菌,分布于7个目7个科12个属,优势菌属为小单孢菌属和红球菌属;菌株L9T122、L1T1Jb1的16S r RNA基因序列与有效发表菌株Agromyces bracchium IFO 16238T(AB023359)、Streptomyces radiopugnans R97T(DQ912930)的相似率最高,分别为97.49%和97.07%,为潜在壤霉菌属和链霉菌属新种;抗菌活性检测结果表明,在20株放线菌中,15株具有抗菌活性,总阳性率为75.00%。其中L2T1Gb21、L9T122对金黄色葡萄球菌和铜绿假单胞菌均有较强的抑菌作用。结论广西北仑河口红树林植物根际土壤中含有较为丰富的放线菌资源,菌株L2T1Gb21、L9T122有较强的抗菌活性,具有开发抗菌新药的潜力。展开更多
基金The National Natural Science Foundation of China under contract No.42476043the Guangxi Key Research and Development Project under contract No.AB21076016+2 种基金the Scientific Research and Technology Development Project of Qinzhou under contract No.202116623the Natural Science Foundation of Guangxi under contract No.2021GXNSFAA075013the China College Students’Innovation and Entrepreneurship Training Program Project under contract No.S202411607002。
文摘Mangrove forests are critical ecosystems for carbon sequestration,effectively capturing atmospheric carbon and permanently storing soil organic carbon(SOC)in coastal wetlands.Recent restoration and afforestation initiatives have been undertaken to mitigate the rising atmospheric CO_(2) concentrations along tropical ocean coasts worldwide.The expansion of mangrove forests has garnered significant attention for elucidating their contributions to the permanent storage of carbon in both surface and subsoil layers.In this study,we investigated a recently expanding mangrove forest in the Beilun River Estuary of Guangxi Province,focusing on the abundance and sources of organic carbon(OC)in surface sediments.We also analyzed sediment grain size distribution,SOC,total nitrogen(TN)content,and stable carbon isotope composition(δ^(13)C).Additionally,we determined the molar ratio of SOC to nitrogen(C/N).The SOC content ranged from 0.25%to 6.58%,the C/N ratio varied from 9.85 to 17.73,δ^(13)C values spanned from-29.58‰to-24.93‰,andδ^(15)N values ranged from 3.10‰to 7.36‰.A strong correlation was observed between SOC and TN content.However,particle size did not significantly influence these relationships.In terms of SOC sources in the sediments,contributions from mangrove,terrestrial,and marine sources accounted for 37.1%to 99.5%,0.5%to 47.4%,and 0%to 17.6%,respectively.The findings of this study provide essential insights for evaluating and managing carbon sinks within the mangrove ecosystems of the Beibu Gulf region,contributing to more effective carbon management strategies in coastal areas.
基金Chinese Offshore Investigation and Assessment(GX-908)grantthe National Science Foundation of China(No.41306083 and 41106076)
文摘The paleoenvironmental history of the Beilun River estuary on the coast of Beibu Gulf in the northwest South China Sea is reconstructed based on fossil diatoms, isotopic dating, sedimentary grain size data, mineralogy and geochemistry in three sediment core samples. Results show that the estuary has experienced significant environmental changes since deposition began about 20,000 yr ago. Freshwater runoff of the Beilun River initially was strong. However, the freshwater runoff reduced significantly after a transgressive event. Subsequently the estuary’s position began to migrate to the northeast. At the end of the Late Pleistocene the estuary shifted gradually towards the southwest. In the Early-Mid Holocene, the estuary’s geomorphology was shaped by seawater transgressing into the ancient river channel. The basin was filled continuously but slowly to form the present Beilun River estuary. Holocene transgression in this area could be divided roughly into three stages, including oscillation period 1, the maximum transgression period, and oscillation period 2.
基金Supported by Ningbo Natural Science Foundation(2017A610074)
文摘An investigation was carried out in wharves, inspection yards, processing plants in Beilun Port and the surrounding areas. Five kinds of exotic harmful weeds were discovered and collected, and they were described and analyzed.
文摘In the history, the main roles of inland rivers in Beilun Port City of Ningbo were desalination,blocking tides, shipping, and flood control. Nowadays, with the continuous spread and deepening ofurbanization, the ecological environment of river courses has been destroyed. In the past, remediationmeasures based on engineering and technology played a certain role, but can not “cure the root cause”. Itshould respect the historical evolution process of river courses, and highlight the ecological service functionand leisure tourism value of river courses from the coordination perspective of urban and rural ecologicalenvironment, economic industries, society and culture in the planning ideas of ecology, production, andlife integration. Four aspects of the measures are as below: protecting and repairing the ecological matrixof river courses;building green space system and maintaining flood control functions through the waternetwork;protecting cultural heritage along the rivers;developing waterfront leisure tourism scenic area.
文摘The method for pest risk analysis was used to make the potential risk analysis and assessment to the 8 Bursaphelenchus species found in the pines in Yuyao, Ningbao, and the corresponding risk management strategies were put forward.
文摘目的从红树林根际淤泥中分离鉴定放线菌并进行多样性分析及抗菌活性研究,为新抗生素的发现提供药用放线菌资源。方法用6种分离培养基,利用涂布平板法分离放线菌;通过PCR扩增获得菌株16S r RNA基因并进行同源性比对,分析放线菌多样性;发酵液经处理分别形成发酵液酯相、发酵液水相和菌丝丙酮浸提液3类样品;纸片扩散法进行抗菌活性测试。结果从5份红树林植物根际淤泥样品中分离纯化得到56株放线菌,分布于7个目7个科12个属,优势菌属为小单孢菌属和红球菌属;菌株L9T122、L1T1Jb1的16S r RNA基因序列与有效发表菌株Agromyces bracchium IFO 16238T(AB023359)、Streptomyces radiopugnans R97T(DQ912930)的相似率最高,分别为97.49%和97.07%,为潜在壤霉菌属和链霉菌属新种;抗菌活性检测结果表明,在20株放线菌中,15株具有抗菌活性,总阳性率为75.00%。其中L2T1Gb21、L9T122对金黄色葡萄球菌和铜绿假单胞菌均有较强的抑菌作用。结论广西北仑河口红树林植物根际土壤中含有较为丰富的放线菌资源,菌株L2T1Gb21、L9T122有较强的抗菌活性,具有开发抗菌新药的潜力。
