检索结果-南通市图书馆

Predicted Climate Change will Increase Landslide Risk in Hanjiang River Basin,China

Journal of Earth Science 2024年第4期35卷 1334-1354页

作者： Xinggang Tang Lingjian Wang Huiyong Wang Yingdan Yuan Dou Huang jinchi zhang Co-Innovation Center for Sustainable Forestry in Southern China Jiangsu Province Key Laboratory of Soil and Water Conservation and Ecological RestorationNanjing Forestry UniversityNanjing210037China Jiangsu Key Laboratory of Crop Genetics and Physiology College of Horticulture and Plant ProtectionYangzhou UniversityYangzhou225009China College of Forestry Nanjing Forestry UniversityNanjing210037China

Landslides are widespread geomorphological phenomena with complex mechanisms that have caused extensive causalities and property damage *** scale and frequency of landslides are presently increasing owing to the warming effects of climate change,which further increases the associated safety *** this study,the relationship between historical landslides and environmental variables in the Hanjiang River Basin was determined and an optimized model was used to constrain the relative contribution of variables and best spatial response *** optimal MaxEnt model was used to predict the current distribution of landslides and influence of future rainfall changes on the landslide *** results indicate that environmental variables in the study area statistically correlate with landslide events over the past 20 *** MaxEnt model evaluation was applied to landslide hazards in the Hanjiang River Basin based on current climate change *** results indicate that 25.9%of the study area is classified as a high-risk *** main environmental variables that affect the distribution of landslides include altitude,slope,normalized difference vegetation index,annual precipitation,distance from rivers,and distance from roads,with a cumulative contribution rate of approximately 90%.The annual rainfall in the Hanjiang River Basin will continue to increase under future climate warming *** rainfall will further increase the extent of high-and medium-risk areas in the basin,especially when following the RCP8.5 climate prediction,which is expected to increase the high-risk area by 10.7%by ***,high landslide risk areas in the basin will migrate to high-altitude areas in the future,which poses new challenges for the prevention and control of landslide *** study demonstrates the usefulness of the MaxEnt model as a tool for landslide susceptibility prediction in the Hanjiang River Basin caused by global warming and yi

关键词： Hanjiang River Basin climate change environmental factor landslide susceptibility assessment MaxEnt model

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

Impact of monoculture of poplar on rhizosphere microbial communities over time

引用

Pedosphere 2020年第4期30卷 487-495页

作者： Qian LU jinchi zhang Lisha CHEN Department of Water and Soil Conservation College of ForestryNanjing Forestry UniversityNanjing 210037China

To date, research on the adverse effects of continuous cropping has focused on field crops;forest plantations, despite their very significant economic and ecological value, have received less attention. The evolution of microbial community in the rhizosphere of forest plantations, in particular, has rarely been examined. In this study, changes in the size, composition, and structure of bacterial and fungal communities in the rhizosphere of different generations of poplar (Populus deltoides) plantations were studied using real-time polymerase chain reaction (PCR) and PCR-denaturing gradient gel electrophoresis and compared with the composition of the microbial community in a bare land (control) adjacent to the plantation sites through sequencing analysis and by constructing phylogenetic trees. The numbers of bacteria and fungi increased significantly with successive poplar generations, although the increases in the two groups were not parallel. When compared with the control, the bacterial community increased greatly in the second generation, and the most significant increase occurred in the third generation. In contrast, the most significant increase in the fungal community occurred in the first generation, and the increase in the third generation was insignificant. In terms of community composition, the first generation showed little change in either community;however, the second generation showed remarkable changes in the bacterial community, and the third in the fungal community. The numbers of Gammaproteobacteria,Alphaproteobacteria, and Actinobacteria increased by 10.92%, 7.38%, and 5.46%, respectively, whereas those of Acidobacteria decreased by 18.38%in the second generation. These changes in the number and composition of microbial communities in the rhizosphere could be one of the reasons for the decline in yield and quality associated with long-term monoculture.

关键词： bacterial community continuous cropping denaturing gradient gel electrophoresis forest plantations fungal community polymerase chain reaction Populus deltoides

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

岩土高效溶蚀菌株Bt NL-11发酵条件优化及应用效果分析

引用

南京林业大学学报（自然科学版） 2024年第3期48卷 71-80页

作者：王凌剑贾赵辉张金池唐兴港孙昕孟苗婧刘鑫南京林业大学水土保持学院、林草学院江苏省水土保持与生态修复重点实验室江苏南京210037 南京林业大学南方现代林业协同创新中心江苏南京210037

【目的】为科学治理废弃矿山边坡,探究土壤细菌永久绿化法在生态修复中的应用与推广,对分离筛选出的高效溶蚀菌株进行发酵条件优化及应用效果分析。【方法】从南京幕府山风化岩壁土壤中分离出多种溶蚀微生物,并从中挑选出1种表现突出的... 详细信息

【目的】为科学治理废弃矿山边坡,探究土壤细菌永久绿化法在生态修复中的应用与推广,对分离筛选出的高效溶蚀菌株进行发酵条件优化及应用效果分析。【方法】从南京幕府山风化岩壁土壤中分离出多种溶蚀微生物,并从中挑选出1种表现突出的溶蚀细菌菌株NL-11[经16S rRNA鉴定为苏云金芽孢杆菌(Bacillus thuringiensis,Bt)]进行发酵条件优化,利用盆栽试验观测其应用效果。首先利用单因素和Plackett Burman(PB)试验筛选出影响菌株生长的3个主要因素,即装液量、培养温度和时间;在此基础上使用最陡爬坡路径逼近最大响应区域;再利用Box-Behnken试验设计及响应面分析法进行回归分析;最后通过比较预测值与实测值验证模型可靠性。利用优化结果制备菌液,将制备好的菌液调节为低(10 cfu/mL)、中(1×10^(5)cfu/mL)和高(1×10^(9)cfu/mL)3种菌液浓度拌入基质(分别为T1、T2、T3处理)进行盆栽试验,设置不加菌液的处理为空白对照(CK),研究不同浓度菌液对矿物风化、植物和根系生长的促进作用。【结果】模型准确可靠,菌株NL-11的最佳发酵培养条件为:装液量19.51 mL,接种量2%(体积分数),初始pH 7.0,培养温度30.30℃,培养时间22.07 h,在此优化条件下发酵液中活菌数达到1.47×10^(10)cfu/mL,是未优化前的2.03倍。盆栽试验结果表明,菌株NL-11能够促进矿物风化,以高浓度菌液效果最显著;NL-11能够促进矿质养分溶解,以高浓度菌液效果最显著;NL-11能够促进植物及根系生长,以中浓度效果最显著。【结论】通过优化试验显著提高了菌株NL-11的发酵活菌产量,为菌株在边坡治理中的应用提供技术支持,综合评价菌株的应用效果并考虑生产成本等因素,喷播实践中的合适菌液浓度为1×10^(5)cfu/mL。

关键词：生态修复苏云金芽孢杆菌发酵条件优化 Box-Behnken设计

来源：

维普期刊数据库博看期刊

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

Maximum Data Generation Rate Routing Protocol Based on Data Flow Controlling Technology for Rechargeable Wireless Sensor Networks

引用

Computers, Materials & Continua 2019年第5期59卷 649-667页

作者： Demin Gao Shuo zhang Fuquan zhang Xijian Fan jinchi zhang College of Information Science and Technology Nanjing Forestry UniversityNanjing210037China Department of Computer Science and Engineering University of MinnesotaMinneapolis MN55455USA

For rechargeable wireless sensor networks,limited energy storage capacity,dynamic energy supply,low and dynamic duty cycles cause that it is unpractical to maintain a fixed routing path for packets delivery permanently from a source to destination in a distributed ***,before data delivery,a sensor has to update its waking schedule continuously and share them to its neighbors,which lead to high energy expenditure for reestablishing path links frequently and low efficiency of energy utilization for collecting *** this work,we propose the maximum data generation rate routing protocol based on data flow controlling *** a sensor,it does not share its waking schedule to its neighbors and cache any waking schedules of other ***,the energy consumption for time synchronization,location information and waking schedule shared will be reduced *** saving energy can be used for improving data collection *** shows our scheme is efficient to improve packets generation rate in rechargeable wireless sensor networks.

关键词： Wireless sensor networks maximum data generation rate rechargeable-WSNs

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

Soil enzyme activities and their indication for fertility of urban forest soil

引用

Frontiers of Environmental Science & Engineering 2008年第2期2卷 218-223页

作者： Qihua SHAN Yuanchun YU Jian YU jinchi zhang College of Forest Resource and Environment Nanjing Forestry UniversityNanjing 210037China College of Territorial Resources and Tourism Anhui Normal UniversityWuhu 241000China

To reveal the biological characteristics of urban forest soil and the effects of soil enzyme on soil fertility as well as the correlation between physicochemical properties and enzyme activities,44 urban forest soil profiles in Nanjing were *** soil physicochemical properties and enzyme activities were analyzed in the *** peroxidase,dehydrogenase,alkaline phosphatase,and cellulase were determined by potassium permanganate titration,TTC(C_(19)H_(15)N_(4)·Cl)colorimetry,phenyl phosphate dinatrium colorimetry,and anthrone colorimetry,*** result showed that soil pH,organic carbon(C),and total nitrogen(N)had great effects on hydrogen peroxidase,dehydrogenase,and alkaline phosphatase activities in 0–20 cm thick ***,pH only had great effect on hydrogen peroxidase,dehydrogenase,and alkaline phosphatase activities in 20–40 cm thick *** peroxidase,dehydrogenase,and alkaline phosphatase were important biological indicators for the fertility of urban forest *** in 0–20 cmand 20–40 cmsoil,soil enzyme system(hydrogen peroxidase,dehydrogenase,alkaline phosphatase,and cellulase)had a close relationship with a combination of physicochemical indicators pH,organic C,total N,available K,available P,cation exchange capacity(CEC),and microbial biomass carbon(C_(mic)).The more soil enzyme activities there were,the higher the fertility of urban forest soil.

关键词： urban forest soil enzyme activities soil fertility correlation analysis Nanjing

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

火法熔炼回收失效重整催化剂中铂的试验研究

引用

中国资源综合利用 2024年第6期42卷 26-28,32页

作者：张金池刘贵清张帆王芳解雪江苏北矿金属循环利用科技有限公司江苏徐州221121

试验以失效重整催化剂为原料,采用火法熔炼工艺高效回收铂,主要考察捕集剂种类、捕集剂用量、碱度、熔炼温度和熔炼时间等因素对铂回收率的影响。结果表明,最优条件下,碱度为1.1,熔炼温度为1 400 ℃,熔炼时间为4 h,捕集剂用量为原料质量... 详细信息

试验以失效重整催化剂为原料,采用火法熔炼工艺高效回收铂,主要考察捕集剂种类、捕集剂用量、碱度、熔炼温度和熔炼时间等因素对铂回收率的影响。结果表明,最优条件下,碱度为1.1,熔炼温度为1 400 ℃,熔炼时间为4 h,捕集剂用量为原料质量的25%,焦炭用量为原料质量的5%,CaO用量为原料质量的40%,熔炼渣的Pt品位为11.8 g/t,Pt回收率为99.27%。所得产物铜合金的主要成分为单质铜,含量为90%~94%,Pt品位为1.95%~1.98%。

关键词：失效重整催化剂铂回收火法熔炼捕集

来源：

维普期刊数据库博看期刊

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

Complex effects of different types of acid rain on root growth of Quercus acutissima and Cunninghamia lanceolata saplings

引用

Ecological Processes 2022年第1期11卷 51-64页

作者： Xin Liu Shilin Ma Zhaohui Jia Muhammad Ramzan Miaojing Meng Jinping Wang Chong Li Yinlong zhang jinchi zhang Co‑Innovation Center for Sustainable Forestry in Southern China Jiangsu Province Key Laboratory of Soil and Water Conservation and Ecological RestorationNanjing Forestry University159 Longpan RoadNanjing 210037JiangsuChina Co‑Innovation Center for Sustainable Forestry in Southern China Nanjing Forestry University159 Longpan RoadNanjing 210037JiangsuChina

Background:Soil acidification caused by acid rain(AR)can damage plant roots,which in turn negatively impacts plant *** response to changing AR types,research efforts to elucidate their specific impacts on plants have become ***:For this study,we investigated the effects of simulated sulfuric,nitric,and mixed AR on the root systems of Quercus acutissima *** Cunninghamia lanceolata(Lamb.)*** different acidity ***:As the AR S/N ratio and pH decreased,the height growth rate(HGR),basal diameter growth rate(DGR),total root length(TRL)and total root surface area(TRS)of *** decreased,whereas the TRL and TRS of *** remained the *** the NO_(3)^(−)concentration in AR was increased,the root activity,superoxide dismutase(SOD)and catalase(CAT)activities of *** roots revealed a downward trend;however,the root activity of *** and the peroxidase(POD)activity of *** roots revealed an upward ***,redundant analysis and structural equation models indicated that AR pH had a greater impact on the HGR of *** than that of ***,while the impact of the AR S/N ratio on *** growth rates was greater than that of ***:Our results suggested that the root systems of different tree species had variable responses to AR,and the AR S/N ratio was an important factor affecting plant root *** might facilitate new strategies for the culti‑vation and protection of plantations in the future.

关键词： Sulfuric and nitric acid rain Root growth Root morphology Root activity Antioxidant enzyme activity

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

废钯催化剂浸出液中钯的硫化沉淀试验研究

引用

中国资源综合利用 2024年第7期42卷 41-44页

作者：张帆吴祖璇王芳刘昱辰张金池江苏北矿金属循环利用科技有限公司江苏徐州221121

湿法工艺是废钯催化剂的主流回收工艺,作为经典的传统湿法工艺,焙烧-浸出-置换-提纯工艺既有显著优势,也存在不足。试验采用HCl-NaClO_(3)体系对废钯催化剂进行浸出,研究硫化沉淀的影响因素,揭示PdS的沉淀规律,完善工艺参数,实现技术优... 详细信息

湿法工艺是废钯催化剂的主流回收工艺,作为经典的传统湿法工艺,焙烧-浸出-置换-提纯工艺既有显著优势,也存在不足。试验采用HCl-NaClO_(3)体系对废钯催化剂进行浸出,研究硫化沉淀的影响因素,揭示PdS的沉淀规律,完善工艺参数,实现技术优化,为产业化应用提供可靠的理论基础。研究表明,硫化沉淀法可以代替产渣量巨大的铁置换法,钯沉淀率可以达到99.99%,尾液的贵金属含量达到相关排放标准,浸出液中的钯实现高效富集。

关键词：废钯催化剂浸出液钯富集回收硫化沉淀

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

硝酸铂制备工艺研究

引用

中国资源综合利用 2024年第7期42卷 37-40页

作者：吴祖璇刘贵清张帆王芳张金池江苏北矿金属循环利用科技有限公司江苏徐州221121

试验采用王水溶解海绵铂,然后加入盐酸赶硝,添加氢氧化钠溶液进行络合,缓慢滴加硝酸,得到六羟基合铂酸,沉淀过滤并洗涤,最后采用硝酸溶解六羟基合铂酸,制备高纯的硝酸铂溶液。其间开展条件试验,明确六羟基合铂酸合成和溶解的最佳条件。... 详细信息

试验采用王水溶解海绵铂,然后加入盐酸赶硝,添加氢氧化钠溶液进行络合,缓慢滴加硝酸,得到六羟基合铂酸,沉淀过滤并洗涤,最后采用硝酸溶解六羟基合铂酸,制备高纯的硝酸铂溶液。其间开展条件试验,明确六羟基合铂酸合成和溶解的最佳条件。氯铂酸浓度为45 g/L,氢氧化钠添加量为海绵铂质量的1.8倍,反应终点pH为5.5,反应温度为80℃时,铂的利用率可超过99%,六羟基合铂酸合成效果最好。硝酸用量为理论量的1.3倍,溶解温度为50℃,溶解时间为6 h时,六羟基合铂酸溶解效果最好。经检测,制备的硝酸铂溶液中,铂含量为15.86%,同时杂质含量符合相关行业标准。

关键词：硝酸铂制备海绵铂六羟基合铂酸合成溶解

来源：

维普期刊数据库博看期刊

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

酸雨类型转变对杉木林地土壤和细根生长的影响

引用

南京林业大学学报（自然科学版） 2024年第3期48卷 90-98页

作者：丁咏刘鑫张金池王宇浩陈美玲李涛刘孝武周悦湘孙连浩廖艺南京林业大学林草学院、水土保持学院南方现代林业协同创新中心江苏省水土保持与生态修复重点实验室江苏南京210037

【目的】探究酸雨类型转变对杉木细根生长和土壤养分含量的影响,为改善酸雨胁迫地区杉木人工林土壤酸化提供依据。【方法】在江苏南京铜山林场进行了为期1 a的野外模拟酸雨试验,设置了3种酸雨酸度(pH为4.5,3.5和2.5)和3种酸雨类型[硫酸... 详细信息

【目的】探究酸雨类型转变对杉木细根生长和土壤养分含量的影响,为改善酸雨胁迫地区杉木人工林土壤酸化提供依据。【方法】在江苏南京铜山林场进行了为期1 a的野外模拟酸雨试验,设置了3种酸雨酸度(pH为4.5,3.5和2.5)和3种酸雨类型[硫酸型酸雨,SO_(4)^(2-)与NO_(3)^(-)的浓度比(硫氮比)5∶1。混合型酸雨,硫氮比1∶1。硝酸型酸雨,硫氮比1∶5],并设置对照CK(pH为6.6,利用当地自然溪水),共10个试验处理。分别测定酸雨胁迫后杉木林地土壤化学性质、细根生理特性及细根元素含量,利用相关性及结构方程模型分析方法,探究酸雨类型转变对杉木细根生长的直接及间接影响。【结果】随着酸雨pH和硫氮比的降低,杉木细根生物量和根系活力均减少。所有强酸雨处理(pH 2.5)杉木根系的过氧化氢酶活性均低于其他酸雨处理,且当酸雨类型转变为硝酸型酸雨时,过氧化氢酶活性逐渐降低并低于CK;另外,细根镁、铝含量及钙铝比(含量比,下同)和镁铝比在不同的硫氮比处理之间均存在差异。与CK相比,所有酸雨处理均增加了细根钙和铝含量,钾含量随着酸雨胁迫逐渐减少。然而,土壤养分总碳、总氮、碳氮比、总硫、有效磷和速效钾在不同硫氮比和不同pH之间不存在显著差异。通过相关性分析可知:土壤pH与镁铝比、根系生物量和根系活力呈极显著正相关(P<0.01),并且根系生物量与过氧化物酶、过氧化氢酶之间均呈显著正相关(P<0.05),却与铝含量呈极显著负相关(P<0.01)。【结论】酸雨酸度对杉木细根和土壤均有较大影响,酸雨类型对细根的影响要强于土壤。其中,酸雨类型对根系活力和钙铝比均有直接影响。随着硫氮比值的降低,酸雨对杉木细根生长的抑制作用更明显。

关键词：杉木酸雨硫氮比细根生物量土壤养分

来源：

维普期刊数据库博看期刊

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：