检索结果-南通市图书馆

Effects of global change and human disturbance on soil carbon cycling in boreal forest: A review

Pedosphere 2023年第1期33卷 194-211页

作者： Pengshuai SHAO Hongyan HAN jingkuan sun Hongtu XIE Shandong Key Laboratory of Eco-Environmental Science for the Yellow River Delta Binzhou UniversityBinzhou 256603China Institute of Applied Ecology Chinese Academy of SciencesShenyang 110016China

Increasing human demands for Earth’s resources are hastening many environmental changes and creating a need to incorporate the routine monitoring of ecosystem functions into forest *** global change and anthropogenic disturbances,soil carbon(C)cycling in terrestrial ecosystems is undergoing substantial changes that result in the transformation between soil C sources and ***,the forest C budget requires an understanding of the underlying soil C dynamic under environmental *** present review focuses on the response and feedback of soil C cycling to global change(climate warming and nitrogen(N)deposition)and human disturbances(fire and logging)and detects the association of soil C cycling with soil C and N efflux and inflow in boreal *** effects of climate warming and N deposition on soil C cycling are complex,especially at short-term temporal *** warming can decay soil organic matter(SOM)to emit substantial amounts of CO2,and differing warming durations result in different effects on soil C loss,ranging from ca.1 to 15 Mg C ha−***-term soil warming mainly reduces the labile soil C pool and increases the decomposition of recalcitrant soil C compounds(e.g.,lignin),whereas longer-term warming may limit soil C loss due to impoverished soil C substrate and microbial *** N addition is conducive to enhancing soil C storage(ca.2–22 Mg C ha−1),by increasing plant productivity including above-and belowground biomass;however,chronic N deposition or excess N addition can result in soil acidity,reducing N use efficiency and plant growth and further resulting in no changes or declines in soil C *** and logging lead to a large quantity of soil C loss via impaired plant productivity and increased organic matter degradation,exacerbating global *** particular,severe fire can cause a large amount of soil C loss,ca.16–34 Mg C ha−1 in the data we ***,the black C input induced by fire

关键词： climate warming forest C budget forest management N deposition soil microorganism terrestrial ecosystem

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Spatiotemporal Variation of Plant Diversity Under a Unique Estuarine Wetland Gradient System in the Yellow River Delta, China

引用

Chinese Geographical Science 2020年第2期30卷 217-232页

作者： sun jingkuan CHI Yuan FU Zhanyong LI Tian DONG Kaikai Shandong Key Laboratory of Eco-Environmental Science for Yellow River Delta Binzhou UniversityBinzhou 256603ShandongChina First Institute of Oceanography Ministry of Natural ResourcesQingdao 266061China

Multiple natural and human factors in estuarine wetlands result in complicated land surface characteristics with distinct spatial and temporal heterogeneities,thereby contributing to the difficulty in identifying spatiotemporal variations and influencing factors of plant diversity.A unique estuarine wetland gradient system(UEWGS)consisting of soil,vegetation,heat,distance,landscape,and anthropogenic gradients was established based on the ecological features of estuarine wetland through remote sensing and field investigation *** resolved the complicated land surface characteristics,covered all aspects of factors influencing plant diversity,and possessed distinct spatiotemporal *** Yellow River Delta,the largest estuarine wetland in the northern China,was selected as the study area to demonstrate UEWGS in four seasons in 2017.A total of 123 species were recorded with considerable seasonal *** australis,Suaeda salsa,and Tamarix chinensis were the dominant species,and crop species also played important *** single effect,all aspects of gradients exerted significant influences,yet only vegetation gradient possessed significant influences in all *** comprehensive effect,soil,vegetation,heat,and distance gradients showed significant gross *** content in soil gradient and net primary productivity in vegetation gradient possessed significant net influences in all seasons and can be considered as the main driving factor and indicator,respectively,of plant *** results validated the significance of UEWGS in revealing the plant diversity spatiotemporal characteristics and influencing factors,and UEWGS possessed universal applicability in the spatiotemporal analysis of plant diversity in estuarine areas.

关键词： plant diversity spatiotemporal variation single effect comprehensive effect Yellow River Delta

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Cloning and expression analysis of the FvNCED3 gene and its promoter from ash(Fraxinus velutina)

引用

Journal of Forestry Research 2019年第2期30卷 471-482页

作者： Tian Li jingkuan sun Chuanrong Li Zhaohua Lu Jiangbao Xia Shandong Provincial Key Laboratory of Eco-Environmental Science for Yellow River Delta Binzhou University Taishan Forest Ecosystem Research Station/Shandong Provincial Key Laboratory of Soil Erosion and Ecological Restoration

The 9-cis-epoxycarotenoid dioxygenase(NCED)gene is rate-limiting in abscisic acid(ABA) *** this study, an NCED gene, designated FvNCED3(KY008746), was cloned from velvet ash(Fraxinus velutina Torr.) with a RACE method. The full length c DNA of FvNCED3 encodes a 573-amino acid *** analysis showed that the FvNCED3 protein was highly homologous to other NCED proteins. The expression patterns of FvNCED3 in different ash organs were analyzed by real-time PCR which revealed that FvNCED3 expression levels were highest in leaves and lowest in roots. The gene expression patterns of FvNCED3 under abiotic stress indicated that its expression increased under drought, salt and ABA stress and decreased due to high and low temperatures. There were no obvious changes under ultraviolet light. The 1094-bp upstream sequence 5' flank regulation region of the FvNCED3 gene was also cloned from ash using the Genome Walking method. To assess the activity of the FvNCED3 promoter, a p FvNCED3 p::GUS plant expression vector was constructed for tobacco transformation. GUS expression of the FvNCED3 GUS enzyme activity was detected in almost all transgenic tobacco tissues, especially in the young leaves,stigma, anther, ovule and ovary. After treating the transgenic tobacco with NaCl and placing it under drought stress, GUS staining of tobacco leaves increased compared with that under normal growth conditions. This result indicates that gene expression driven by the FvNCED3 promoter can be induced by salt and drought stress.

关键词： Ash Function analysis NCED gene Promoter Tobacco

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nitrogen Biological Cycle Characteristics of Seepweed(Suaeda salsa) Wetland in Intertidal Zone of Huanghe(Yellow) River Estuary

引用

Chinese Geographical Science 2012年第1期22卷 15-28页

作者： sun Zhigao MOU Xiaojie sun jingkuan SONG Hongli YU Xiang WANG Lingling JIANG Huanhuan sun Wanlong sun Wenguang Shandong Key Laboratory for Eco-Environmental Science of Yellow River Delta Coastal Wetland Ecological Research Base of Yantai Institute of Coastal Zone Research Chinese Academy of Sciences Binzhou 256603 China Key Laboratory of Coastal Environment Processes of Chinese Academy of Sciences Shandong Provincial Key Laboratory of Coastal Zone Environmental Processes Yantai Institute of Coastal Zone Research Chinese Academy of Sciences Yantai 264003 China Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changchun 130012 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

From April 2008 to November 2009, the nitrogen （N） cycle of plant-soil system in seepweed （Suaeda salsa） wetland in the intertidal zone of the Huanghe （Yellow） River estuary was studied. Results showed that soil N had sig- nificant seasonal fluctuations and vertical distribution, and the net N mineralization rates in topsoil were significantly different in growing season （p 〈 0.01）. The N/P ratio （9.87 ±1.23） of S. salsa was less than 14, indicating that plant growth was limited by N. The N accumulated in S. salsa litter at all times during decomposition, which was ascribed to the N immobilization by microbes from the environment. Soil organic N was the main N stock of plant-soil system, accounting for 97.35% of the total N stock. The N absorption and utilization coefficients of S. salsa were very low （0.0145 and 0.3844, respectively）, while the N cycle coefficient was high （0.7108）. The results of the N turnovers among compartments of S. salsa wetland showed that the N uptake amount of aboveground part and root were 7.764 g/m2and 4.332 g/m2, respectively. The N translocation amounts from aboveground part to root and from root to soil were 3.881 g/m2 and 0.626 g/m2, respectively. The N translocation amount from aboveground living body to litter was 3.883 g/m2, the annual N return amount from litter to soil was more than 0.125（-） g/m2 （minus represented immobili- zation）, and the net N mineralization amount in topsoil （0-15 cm） in growing season was 1.190 g/m2. The assessment of N biological cycle status orS. salsa wetland indicated that N was a very important limiting factor and the ecosystem was situated in unstable and vulnerable status. The S. salsa was seemingly well adapted to the low-nutrient status and vulnerable habitat, and the N quantitative relationships determined in the compartment model might provide scientific base for us to reveal the special adaptive strategy orS. salsa to the vulnerable habitat in the following studies.

关键词： nitrogen biological cycle seepweed wetland Huanghe (Yellow) River estuary

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Microbial residues as the nexus transforming inorganic carbon to organic carbon in coastal saline soils

引用

Soil Ecology Letters 2022年第4期4卷 328-336页

作者： Pengshuai Shao Tian Li Kaikai Dong Hongjun Yang jingkuan sun Shandong Key Laboratory of Eco-Environmental Science for the Yellow River Delta Binzhou UniversityBinzhou 256603China

Soil inorganic carbon(SIC),including mainly carbonate,is a key component of terrestrial soil C *** microorganisms can assimilate carbonate as the main or unique C source,how microorganisms convert SIC to soil organic carbon(SOC)remains unclear.A systematic field survey(n=94)was performed to evaluate the shift in soil C components(i.e.,SIC,SOC,and microbial residues)along a natural salinity gradient(ranging from 0.5‰to 19‰),and further to explore how microbial necromass as an indicator converting SIC into SOC in the Yellow River *** observed that SIC levels linearly decreased with increasing salinity,ranging from~12 g kg^(-1)(salinity6‰).Additionally,the concentrations of SOC and microbial residues exponentially decreased from salinity6‰,with the decline of 39%and 70%,*** residues and SOC was tightly related to the variations in *** structural equation model showed the causality on explanation of SOC variations with SIC through microbial residues,which can contribute 89% of the variance in SOC storage combined with *** together,these two statistical analyses can support that microbial residues can serve as an indicator of SIC transition to *** study highlights the regulation of microbial residues in SIC cycling,enhancing the role of SIC playing in C biogeochemical cycles and enriching organic C reservoirs in coastal saline soils.

关键词： Soil inorganic carbon Microbial necromass Soil organic carbon Costal saline lands Carbon sequestration

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Analysis and Optimisation of Halomonas Growth Factors Based on PCA and RSM

引用

China Petroleum Processing & Petrochemical Technology 2019年第4期21卷 81-87页

作者： Shi Ke Huang Guofu Xu Huachun Xue Jianliang sun jingkuan Xiao Xinfeng Li Lin College of Chemical and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590 Shandong Key Laboratory of Eco-Environmental Science for Yellow River Delta(Binzhou University) Bingzhou 256600 Shandong Peninsula Engineering Research Center of Comprehensive Brine Utilization Weifang University of Science and TechnologyShouguang 262700

The biomass of petroleum-degrading bacteria, such as Halomonas spp., is crucial to the alleviation of severe oil spills through bioremediation. In this paper, the bacterium(HDMP1) was isolated and identified. Growth factors were analysed and optimised through the single-factor experiments, the factor analysis(FA), the principal component analysis(PCA), and the response surface methodology(RSM). Results indicated that HDMP1 was identified as genus Halomonas. In the single-factor experiments, the range of suitable growth conditions for HDMP1 covered: a salt concentration of 2%-4%, a medium pH value of approximately 9, an inoculum concentration of 1.0%, a substrate concentration of 1.0%-1.4%, and a rotation rate of 140 r/min. The evaluation by FA and PCA indicated that three significant growth factors were the salt concentration, the pH value, and the rotation rate. A maximum biomass of HDMP1 was obtained under the conditions covering a salt concentration of 3.5%, a medium pH of 8, and a rotation rate of 151 r/min by optimization.

关键词： biomass factor analysis principal component analysis growth factors response surface methodology

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Systematic degradation mechanism and pathways analysis of the immobilized bacteria:Permeability and biodegradation,kinetic and molecular simulation

引用

Environmental Science and Ecotechnology 2020年第2期2卷 57-63页

作者： Xinge Fu Huajun Wang Yu Bai Jianliang Xue Yu Gao Shugang Hu Tongtong Wu jingkuan sun College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdaoShandong266590China College of Chemical Engineering and Environment China University of PetroleumChangpingBeijing102249China China Unicom System Integration Co. LtdNo.131Xidan North RoadBeijing100085China Shandong Key Laboratory of Eco-Environmental Science for Yellow River Delta(Binzhou University) Binzhou256600China

In order to effectively improve the degradation rate of diesel,a systematic analysis of the degradation mechanism used by immobilized bacteria is *** the present study,diesel degradation mechanisms were assessed by analyzing permeability,biodegradation,adsorption kinetics,and molecular *** found that bacteria immobilized on cinnamon shells and peanut shells degraded relatively high amounts of diesel(69.94%and 64.41%,respectively).The primary degradation pathways used by immobilized bacteria included surface adsorption,internal uptake,and *** adsorption was dominant in the early stage of degradation,whereas biodegradation was dominant in later *** diesel adsorption rate of the immobilized bacteria was in agreement with the pseudo second-order kinetic *** immobilized bacteria and diesel interacted through hydrogen bonds.

关键词： Immobilized bacteria Biodegradation Bioremediation Kinetics Molecular simulation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

土壤改良剂对黄河三角洲滨海盐碱土生化特性的影响

引用

生态学报 2017年第2期37卷 425-431页

作者：王睿彤孙景宽陆兆华滨州学院山东省黄河三角洲生态环境重点实验室滨州256603 中国矿业大学(北京)恢复生态学研究所北京100083

以黄河三角洲滨海盐碱土为研究对象,采用4因素4水平正交设计试验,将牛粪(A)、石膏(B)、秸秆(C)、保水剂(D)4种改良剂设置成不同比例,对黄河三角洲滨海盐碱土生化特性进行改良试验,以期筛选出适宜的改良方案。结果表明:牛粪(A)、石膏(B)... 详细信息

以黄河三角洲滨海盐碱土为研究对象,采用4因素4水平正交设计试验,将牛粪(A)、石膏(B)、秸秆(C)、保水剂(D)4种改良剂设置成不同比例,对黄河三角洲滨海盐碱土生化特性进行改良试验,以期筛选出适宜的改良方案。结果表明:牛粪(A)、石膏(B)、秸秆(C)3种改良剂对土壤呼吸强度、土壤磷酸酶、土壤脲酶、土壤脱氢酶和土壤微生物碳氮改良效果明显,保水剂(D)对土壤微生物碳氮改良效果明显,各处理间差异显著。各改良剂对盐碱土各生化指标的贡献值存在差异,综合考虑土壤呼吸强度、土壤酶、土壤微生物碳氮适宜配方为A_4B_3C_2D_2,土壤呼吸强度、土壤磷酸酶、土壤脲酶、土壤脱氢酶和土壤微生物碳氮分别比对照增高109.64%,89.54%,62.20%,81.75%,60.50%,118.00%,相关分析表明,除微生物氮和脲酶相关不显著外,上述各土壤生化指标间均显著相关,研究结果可为黄河三角洲盐碱土的改良利用提供一定的理论依据。

关键词：改良剂黄河三角洲滨海盐碱土正交设计生化特性

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

木犀草素过饱和自乳化释药系统的制备与大鼠药动学的研究

引用

沈阳药科大学学报 2023年第10期40卷 1277-1283页

作者：孙经宽刘晶红大连医科大学附属第二医院药剂科辽宁大连116023

目的制备木犀草素过饱和自微乳化给药系统(luteolin supersaturation self microemulsifying drug delivery system,LUT-S-SMEDDS),以提高木犀草素的口服生物利用度。方法根据木犀草素在不同种类油相、乳化剂和助乳化剂中的溶解度、配... 详细信息

目的制备木犀草素过饱和自微乳化给药系统(luteolin supersaturation self microemulsifying drug delivery system,LUT-S-SMEDDS),以提高木犀草素的口服生物利用度。方法根据木犀草素在不同种类油相、乳化剂和助乳化剂中的溶解度、配伍相容性以及伪三元相图确定了LUT-SMEDDS的处方,并加入沉淀抑制剂制备成LUT-S-SMEDDS;评价了LUT-SMEDDS和LUT-S-SMEDDS的理化性质;比较了LUT-混悬剂、LUT-SMEDDS和LUT-S-SMEDDS经大鼠口服后体内药动学。结果选择单亚油酸甘油酯(maisine)为油相,辛酸/癸酸聚乙二醇甘油酯(labrasol)为乳化剂,二乙二醇单乙基醚(transcutol,HP)为助乳化剂,配比为体积比4∶4.5∶1.5,制备的LUT-SMEDDS和LUT-S-SMEDDS具有较强的自乳化性和分散稳定性;使用Soluplus作为沉淀抑制剂制备的LUT-S-SMEDDS可以在长时间内维持药物处于较高浓度状态;与LUT-混悬剂和LUT-SMEDDS相比,LUT-S-SMEDDS显著提高了大鼠的口服生物利用度。结论将木犀草素制备成过饱和自乳化释药系统,可加快药物溶出,抑制药物析晶,显著提高药物口服生物利用度。

关键词：木犀草素过饱和自乳化释药系统沉淀抑制剂生物利用度

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

黄河口芦苇湿地不同恢复阶段种群生态特征

引用

生态学报 2015年第17期35卷 5804-5812页

作者：孙文广孙志高孙景宽孙万龙中国科学院烟台海岸带研究所海岸带环境过程与生态修复重点实验室山东省海岸带环境过程重点实验室烟台264003 中国科学院大学北京100049 山东省黄河三角洲生态环境重点实验室滨州学院滨州256603

采用时空替代法,选择黄河口未恢复区(R0)、恢复5a区(R2007)和恢复10a区(R2002)的芦苇湿地为研究对象,研究了建群种芦苇的株高、密度、立枯物量、地上生物量的动态变化趋势。结果表明,不同恢复阶段的芦苇株高整体均呈增加趋势,且R2002与... 详细信息

采用时空替代法,选择黄河口未恢复区(R0)、恢复5a区(R2007)和恢复10a区(R2002)的芦苇湿地为研究对象,研究了建群种芦苇的株高、密度、立枯物量、地上生物量的动态变化趋势。结果表明,不同恢复阶段的芦苇株高整体均呈增加趋势,且R2002与其它两个恢复阶段差异显著(PR2007≈R0,其季节动态符合抛物线模型(y=b0+b1t+b2t2,R2≥0.90,PR2007>R0。不同恢复阶段芦苇的立枯物量随时间变化均符合指数增长模型(y=A0ebT+B0,R2>0.95,PR2007>R0,但其差异不显著。研究发现,不同恢复阶段的湿地水文情势(积水深度和水质)是导致芦苇种群生态特征和地上生物量差异的重要因素,故建议下一步湿地恢复工程蓄水应采取少量多次补水措施,并应避开水质较差时间。

关键词：生态恢复芦苇湿地生态特征水文情势黄河口

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：