2篇
您的检索式：作者名="Rajendra Bhandari"
|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Contrasting lipid biomarkers in mountain rivers in the Nepal Himalayas: Organic matter characteristics and contribution to the fluvial carbon pool显示文摘The Nepal Himalayas is the source of many glacial and spring-fed river systems crisscrossing the mountainous terrain.There is an increasing recognition of small mountain rivers(SMRs)to have a significant combined export of dissolved and particulate organic carbon to the global carbon flux.We analyzed fluvial sediments from two SMRs and compared the results with two large mountain rivers(LMRs)in Nepal.We investigated the organic matter(OM),its compositional variability,and seasonal export using a suite of lipid biomarkers,namely n-alkanes,n-alkanoic acids,n-alkanols,and sterols.The SMRs indicated a similarity in lipid distribution and were affected by a strong seasonal variability.The LMRs showed a distinct contrast in the distribution of lipids in suspended sediments.Bedload sediments in SMRs were derived from diverse sources with weak terrigenous dominance all-year-round compared to the suspended load.Functional lipids(n-alkanoic acids and n-alkanols)were the major constituents in SMR sediments,indicating better preservation.In contrast,n-alkane concentration dominated over other fractions in suspended sediments retrieved from LMRs.The biomarker trends differentiate SMRs from LMRs with lower transformed/degraded OM in SMRs.A common observation was the strong presence of even carbon compounds in short-chain n-alkanes in SMR bedload sediments and their predominance in suspended sediments in LMRs.Such an unusual trend is attributed to specific biomarker sources from the catchment and ongoing processes in fluvial systems.Topsoil colonized by fungal species under moist acidic conditions and autochthonous bacteria contributes to the organic matter pool in shallow SMRs.In LMRs,the contribution from thermally mature sedimentary hydrocarbons and the diagenetic reduction of nalkanoic acids to n-alkanes are additional contributors to the allochthonous carbon pool.The differences in lipid concentrations,their distribution,seasonality,and the size of rivers suggest differential preservation/degradation of the organic matter pool and their importance in contributing to the carbon budget. | Rajendra Bhandari Joyanto Routh Subodh Sharma Rajendra Joshi | 2021 | Geoscience Frontiers2021，12，6： | 0 |
| 2 | 灾难教育与管理为学生,教师和灾害管理人员所著显示文摘灾害造成巨大的经济、人员损失,全球应共同努力,开发、采用新技术,以提高危险和灾害的预测水平。本书通过地震、海啸、火山爆发、山体滑坡、飓风、龙卷风、洪水、火灾和暴风雪灾害的经典案例,介绍了在灾害管理中科学和技术发展的价值,在灾害管理、公众反应以及备灾预警方面给予人们正确的引导与教育。通过科学探究、战略规划、能力建设、敏捷思考、积极协同的预防行动和快速反应,表达了对无灾害世界的美好憧憬。 | Rajendra Kumar Bhandari 李亚宁 | 2015 | 国外科技新书评介2015，0，3： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员