Results 31 to 40 of about 5,520 (166)

若尔盖高寒草地沙化对土壤活性有机碳组分的影响

open access: yesShuitu Baochi Xuebao, 2016
为了解若尔盖高寒草地沙化对土壤活性有机碳组分的影响,采用空间代替时间的方法,通过野外土壤采集,并结合室内化验分析,研究了若尔盖高寒草原不同沙化阶段土壤有机碳及其活性组分的含量和变化特征。结果表明:沙化对高寒草地0—60 cm土层土壤有机碳含量具有显著影响,随沙化程度加剧,土壤总有机碳、溶解性有机碳、易氧化有机碳和微生物量碳含量均呈现显著下降的特征,极重度沙化阶段较潜在沙化阶段分别减少了74.76%,80.24%,76.02%和83.24%;活性有机碳组分的损失较土壤总有机碳明显 ...
费 凯   +5 more
doaj  

Elevation, soil pH and calcium availability shape regional and local scale spatial patterns of PhoD gene abundance in tropical and subtropical forests

open access: yesFunctional Ecology, Volume 40, Issue 4, Page 983-1000, April 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Organic phosphorus mineralization is a critical process in the phosphorus cycle, governing phosphorus bioavailability for plants. The PhoD gene, which encodes the key enzyme alkaline phosphatase, serves as a valuable biomarker for this process.
Sandhya Mishra   +3 more
wiley   +1 more source

On the dissolution of CaCO3 in seawater based on lab incubation experiments [PDF]

open access: yes, 2016
作为地表系统最大的“活跃”碳储库,海洋吸收了大约30%人类排放的二氧化碳(CO2)。海洋通过溶解度泵和生物泵调节大气中的CO2浓度,生物泵包括有机碳泵和碳酸盐泵。其中,碳酸盐泵主要通过钙化生物主导的碳酸钙(CaCO3)生成、溶解和沉降实现,是海洋碳循环的重要组成部分。据估算,60-80%的CaCO3在溶跃面以上已经溶解。较多研究者认为是生物作用等非热力学控制的过程导致了饱和水体中CaCO3的溶解,并提出以下假设:海洋中聚集在CaCO3颗粒表面的微生物,通过呼吸作用释放CO2使CaCO3颗粒周围的pH降低,
魏雅雯
core  

Ionic‐Liquid‐Assisted Synthesis of NiTe/CoTe Heterostructure With Te Vacancies in N, P, and F Co‐Doped Hollow Carbon Nanorods for Efficient Alkaline Hydrogen Evolution and High‐Performance Flexible Supercapacitors

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT Low conductivity, slow ion‐diffusion, and limited reactive sites are common problems in electrocatalysts and electrode materials. In this study, a complex NiTe–CoTe heterojunction with abundant Te vacancies embedded in N, P, and F co‐doped hollow carbon nanorods (NiTe1−x–CoTe1−x/NPFC) was fabricated via a simple ionic liquid‐assisted ...
Mingjie Yi   +7 more
wiley   +1 more source

Marine flavobacterium Gramella flava JLT2011 utilization polysaccharide of phytoplankton and characterization of new species of Pelagibaca bacterium [PDF]

open access: yes, 2015
海洋浮游植物是海洋食物网的初级生产者,是海洋有机质重要分泌者。海洋浮游植物光合作用产生的有机质,通过海洋细菌分泌的一系列胞外酶等将颗粒有机质POM(ParticleOrganicMatter,POM)进一步代谢为生物可利用的溶解有机质(BioavailableDissolvedOrganicMatter,BDOM)。在这一个过程中噬纤维菌-黄杆菌-拟杆菌(Cytophaga-Flavobacterium-Bacteroides,CFB)菌群起着重大的作用。这类细菌形态多样,一般具有较强的运动性和粘附性 ...
林颖芳
core  

Rational Design of Multifunctional Nano–Architected Coatings for Bipolar Plates in Proton Exchange Membrane Fuel Cells

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT Proton exchange membrane fuel cells (PEMFCs) require advanced bipolar plate coatings to enhance efficiency, durability, and commercialization potential. This review presents a systematic framework for evaluating and designing bipolar plate coatings, integrating material selection, performance metrics, deposition techniques, and future ...
Shijie Li   +12 more
wiley   +1 more source

Contribution of Different Processes in Wetland Soil N_2O Production in Different Restoration Phases of the Yellow River Estuary, China [PDF]

open access: yes, 2014
采用时空替代法,选择黄河口生态恢复前后未恢复区(R_0)、2007年恢复区(R_(2007))和2002年恢复区(R_(2002))的芦苇湿地为研究对象,分析了生态恢复工程对湿地土壤N_2O产生不同过程与贡献的影响. 结果表明,尽管不同恢复阶段湿地土壤N_2O总产生量差异明显,但总体均表现为N_2O释放. 恢复区湿地土壤的N_2O产生量大于未恢复区.
孙万龙   +4 more
core  

Multiscale Study of a Synergistic System in Carbon‐Coated Multimetal‐Based Selenides Toward Rapid and Highly Stable Sodium Storage

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT The development of sodium‐ion batteries (SIBs) is limited by slow charge transfer kinetics and large material volume changes caused by the large radius of Na+. Leveraging the excellent physicochemical properties and unique heterostructures of metal selenides, ultrafine hetero‐CuFeSe2‐CoSe2 nanoparticles are in situ wrapped by ...
Ying Zhu   +5 more
wiley   +1 more source

Remote Sensing Retrieval Algorithms and Spatial-temporal Characteristics of POC in the South China Sea [PDF]

open access: yes, 2015
颗粒有机碳(ParticulateOrganicCarbon,POC)是海洋生物地球化学过程的重要组成部分,随着光学技术和遥感手段的进步,在不同时空尺度下监测POC取得很大突破。本文以2011年国家自然科学基金委南海共享航次现场光学数据为基础,探索适用于南海POC反演的海色卫星遥感算法,将算法应用到卫SeaWifs遥感反射比Rrs(λ)数据,得到南海月平均POC,并分析其在季节和年际时间尺度上的时空变化特征。 首先,依据现场观测遥感反射比Rrs(λ)和POC,用多种方法来估算南海表层POC浓度 ...
张鹏
core  

互花米草入侵对我国红树林湿地土壤碳组分的影响

open access: yesShuitu Baochi Xuebao, 2017
以福建漳江口、九龙江口、闽江口和浙江乐清湾为研究区,采集红树林和入侵种互花米草(入侵前为红树林)湿地土壤样品,分析互花米草入侵后土壤有机碳(SOC)、有机碳储量(SOCS)、活性有机碳组分(微生物生物量碳MBC、易氧化有机碳EOC、水溶性有机碳WSOC)以及有机碳键合组分(钙键结合有机碳(Ca—SOC)和铁铝键结合有机碳(Fe(Al)—SOC))的变化,探讨互花米草入侵对土壤有机碳组分以及稳定性的影响。结果表明:互花米草入侵红树林后,土壤SOC、SOCS、MBC和EOC总体上有所降低 ...
陈桂香, 高灯州, 陈, 王维奇
doaj  

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