检索结果-南通市图书馆

气候因子调节荒漠土壤中丰富和稀有微生物群落的聚集过程

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

Journal of Plant Ecology 2023年第6期16卷 220-235页

作者： Qiang Sun Hang-Yu Li Kuan Li Xiao-Qing Zhang Ya-Bo Shi Yan-Tao Wu Xing Li Zhi-Yong Li Jing-Hui Zhang Li-Xin Wang Cun-Zhu Liang ministry of education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau&Collaborative innovation center for grassland ecological security Ministry of Education of ChinaSchool of Ecology and EnvironmentInner Mongolia UniversityHohhot 010021China Inner Mongolia M∙Grass Seed Industry Co. Ltd.Hohhot 010010China School of Resources and Environment Baotou Teachers'CollegeBaotou 014030China Inner Mongolia Academy of Forestry Science Hohhot 010010China

土壤微生物由少数的丰富类群和大量的稀有类群组成,它们对生态系统的功能和服务有不同的贡献。本研究采用高通量测序技术对荒漠土壤样品的物种组成进行DNA测序分析,揭示土壤微生物丰富类群和稀有类群的组成结构。采用相关性分析和随机... 详细信息

土壤微生物由少数的丰富类群和大量的稀有类群组成,它们对生态系统的功能和服务有不同的贡献。本研究采用高通量测序技术对荒漠土壤样品的物种组成进行DNA测序分析,揭示土壤微生物丰富类群和稀有类群的组成结构。采用相关性分析和随机森林方法进一步分析环境因子对丰富和稀有类群群落的影响。最后,利用基于零模型的β-最近类群指数(βNTI)解析土壤微生物的群落构建机制。研究结果表明,在荒漠土壤中,稀有细菌的群落构建几乎完全由确定性的同质选择过程支配;相比之下,随机过程对丰富细菌的影响更为明显。然而,无论是丰富真菌还是稀有真菌都表现出相似的群落构建模式,即确定性过程和随机过程共同决定了真菌的群落构建过程。这些结果表明,随着平均年降水量(MAP)和平均年气温(MAT)的增加,丰富细菌的群落构建过程从随机性转变为确定性。而对稀有真菌来说,随着MAT的增加,群落构建过程从确定性向随机性转变。该研究提供了MAT和MAP调节荒漠土壤中丰富和稀有微生物群落构建过程的明确证据。这些发现为进一步研究土壤微生物群落结构和生态功能奠定了理论基础。

关键词：生物地理学确定性过程随机过程丰富类群和稀有类群气候因素

Rainfall amount determines annual herb controls over soil seed bank and its similarity with vegetation in the Tengger Desert

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

ecological Processes 2022年第1期11卷 27-37页

作者： Ya‑Fei Shi Zeng‑Ru Wang Bing‑Xin Xu Jian‑Qiang Huo Rui Hu Yang Zhao Zhi‑Shan Zhang Shapotou Desert Research and Experiment Station Northwest Institute of Eco‑Environment and ResourcesChinese Academy of SciencesLan‑zhou 730000Gansu ProvincePeople’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China State Key Laboratory of grassland Agro‑Ecosystems Key Laboratory of Grass‑land Livestock Industry InnovationMinistry of Agriculture and Rural AffairsEngineering Research Center of Grassland IndustryMinistry of EducationCollege of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhou 730020Gansu ProvincePeople’s Republic of China

Background:Soil seed banks may offer great potential for maintaining and restoring desert ecosystems that have been degraded by climate change and anthropogenic ***,few studies have explored the year‑to‑year dynamics in the species composition(richness and abundance)of these desert soil seed ***,we conducted a 4‑year study to assess the effects of environmental factors(meteorology and microtopography)and aboveground vegetation on the soil seed bank of the Tengger Desert,***:We found the seed bank was dominated by annual herb species both in species richness and *** rainfall in the growing season increased the number of seeds in the soil seed bank,and quadrat micro‑elevation had a negative effect on soil seed bank *** species composition in the seed bank had significantly larger between‑year similarity than that in the aboveground vegetation due to the dominance of annual herb *** different life forms,the species composition of annual herbs showed distinctly larger temporal similarity between the aboveground vegetation and the seed bank compared with perennial herbs and ***:Our findings highlight that the combined effects of environmental factors and plant life forms deter‑mine the species composition(especially the abundance)of soil seed banks in ***,if degraded desert ecosystems are left to regenerate naturally,the lack of shrub and perennial herb seeds could crucially limit their *** intervention and management may have to be applied to enhance the seed abundance of perennial lifeforms in degraded deserts.

关键词： Desert ecosystem Seed bank dynamics Rainfall Plant type Vegetation regeneration Annual herbs

Density functional calculations of efficient H_2 separation from impurity gases(H_2,N_2,H_2O,CO,Cl_2, and CH_4)via bilayer g-C_3N_4 membrane

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2019年第4期28卷 362-369页

作者： Chunmei Tang Xinbo Wang Cheng Wang Ling Fu College of Science Hohai University College of Agricultural Engineering Nanyang Normal University Henan Key Laboratory of Ecological Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province Collaborative innovation center of Water security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province

Membrane technology has been used for H_2 purification. In this paper, the systematic density functional simulations are conducted to study the separation of H_2 from the impurity gases(H_2, N_2, H_2 O, CO, Cl_2, and CH_4) by the bilayer porous graphitic carbon nitride(g-C_3 N_4) membrane. Theoretically, the bilayer g-C3 N4 membrane with a diameter of about3.25 A? should be a perfect candidate for H_2 purification from these mixed gases, which is verified by the high selectivity(S) for H_2 over other kinds of gases(3.43 × 1028 for H_2/N2; 1.40 × 1028 for H_262/H_2 O; 1.60 × 10 for H_2/CO; 4.30 × 10^(14) for H_2/Cl_2; 2.50 × 10^(55) for H_2/CH_4), and the permeance(P) of H_2(13 mol/m^2·s·Pa) across the bilayer g-C_3 N_4 membrane at 300 K, which should be of great potential in energy and environmental research. Our studies highlight a new approach towards the final goal of high P and high S molecular-sieving membranes used in simple structural engineering.

关键词： g-C3N4 gas separation density functional molecular dynamics simulation

Quantifying Multi-hazards and Impacts Over Different Growth Periods of Maize:A Study Based on Index Construction

在线全文

学校读者我要写书评

暂无评论

International Journal of Disaster Risk Science 2023年第5期14卷 822-839页

作者： Dan Chen Ying Guo Rui Wang Yunmeng Zhao Kaiwei Li Jiquan Zhang Xingpeng Liu Zhijun Tong Chunli Zhao School of Environment Northeast Normal UniversityChangchun130024China Jilin Province Science and Technology innovation center of Agro-Meteorological Disaster Risk Assessment and Prevention Northeast Normal UniversityChangchun130024China Key Laboratory for Vegetation Ecology Ministry of EducationChangchun130024China State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration Northeast Normal UniversityChangchun130024China College of Forestry and grassland Jilin Agricultural UniversityChangchun130024China

Owing to the complexity and variability of global climate,the study of extreme events to ensure food security is particularly *** standardized precipitation requirement index(SPRI)and chilling injury index(I_(Ci))were introduced using data from agrometeorological stations on the Songliao Plain between 1981 and 2020 to identify the spatial and temporal variability of drought,waterlogging,and low-temperature cold damage during various maize growth *** drought and low-temperature cold damage events(CDLEs)and compound waterlogging and low-temperature cold damage events(CWLEs)were then *** measure the intensity of compound events,the compound drought and low-temperature cold damage magnitude index(CDLMI),and compound waterlogging and low-temperature cold damage magnitude index(CWLMI)were constructed by fitting marginal ***,the effects of extreme events of various intensities on maize output were *** findings demonstrate that:(1)There were significant differences in the temporal trends of the SPRI and ICiduring different maize growth *** predominated in the middle growth period(MP),waterlogging predominated in the early growth period(EP)and late growth period(LP),and both drought and waterlogging tended to increase in intensity and *** frequency of low-temperature cold damage showed a decreasing trend in all periods.(2)The CDLMI and CWLMI can effectively determine the intensity of CDLEs and CWLEs in the study area;these CDLEs and CWLEs had higher intensity and frequency in the late growth period.(3)Compared to single events,maize relative meteorological yield had a more significant negative correlation with the CDLMI and CWLMI.

关键词： Compound events magnitude index Drought Growth periods Low-temperature cold damage Spatiotemporal distribution Waterlogging

Spatial-temporal changes and driving factors of eco-environmental quality in the Three-North region of china

在线全文

学校读者我要写书评

暂无评论

Journal of Arid Land 2023年第3期15卷 231-252页

作者： LONG Yi JIANG Fugen DENG Muli WANG Tianhong SUN Hua Research center of Forestry Remote Sensing&Information Engineering Central South University of Forestry and TechnologyChangsha 410004China Key Laboratory of Forestry Remote Sensing Based Big Data&ecological security for Hunan Province Changsha 410004China Key Laboratory of National Forestry&grassland Administration on Forest Resources Management and Monitoring in Southern Area Changsha 410004China

Eco-environmental quality is a measure of the suitability of the ecological environment for human survival and socioeconomic *** the spatial-temporal distribution and variation trend of eco-environmental quality is essential for environmental protection and ecological *** remote sensing ecological index(RSEI)can quickly and objectively quantify eco-environmental quality and has been extensively utilized in regional ecological environment *** this paper,Moderate Resolution Imaging Spectroradiometer(MODIS)images during the growing period(July-September)from 2000 to 2020 were obtained from the Google Earth Engine(GEE)platform to calculate the RSEI in the three northern regions of china(the Three-North region).The Theil-Sen median trend method combined with the Mann-Kendall test was used to analyze the spatial-temporal variation trend of eco-environmental quality,and the Hurst exponent and the Theil-Sen median trend were superimposed to predict the future evolution trend of eco-environmental *** addition,ten variables from two categories of natural and anthropogenic factors were analyzed to determine the drivers of the spatial differentiation of eco-environmental quality by the geographical *** results showed that from 2000 to 2020,the RSEI in the Three-North region exhibited obvious regional characteristics:the RSEI values in Northwest china were generally between 0.2 and 0.4;the RSEI values in North china gradually increased from north to south,ranging from 0.2 to 0.8;and the RSEI values in Northeast china were mostly above *** average RSEI value in the Three-North region increased at an average growth rate of 0.0016/a,showing the spatial distribution characteristics of overall improvement and local degradation in eco-environmental quality,of which the areas with improved,basically stable and degraded eco-environmental quality accounted for 65.39%,26.82%and 7.79%of the total study area,*** Hurst

关键词： eco-environmental quality remote sensing ecological index Google Earth Engine Hurst exponent geographical detector Three-North region of china

Science and Technology Backyard: A novel approach to empower smallholder farmers for sustainable intensification of agriculture in china

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2019年第8期18卷 1657-1666页

作者： JIAO Xiao-qiang ZHANG Hong-yan MA Wen-qi WANG Chong LI Xiao-lin ZHANG Fu-suo center for Resources Environment and Food Security Department of Plant Nutrition/Key Laboratory of Plant-Soil InteractionsMinistry of Education China Agricultural University Beijing 100193 P.R.China College of Resources and Environment Science Hebei Agricultural University Baoding 071001 P.R.China

Sustainable feeding of the growing population in china without ecological destabilization is a grand challenge. In this populous country where agriculture is dominated by smallholder farming, developing innovative technology and translating scientific knowledge into action for smallholder farmers is a crucial step in addressing this challenge. Here, we present a novel approach for technology innovation and dissemination to achieve sustainable intensification in the fields of smallholder farmers. The Science and Technology Backyard(STB) is a hub in a rural area that links knowledge with practices to promote technology innovation and exchange. In this study, the framework and functions of STB are introduced, and the key implications for sustainable intensification across millions of smallholder farmers are explicitly stated:(i) develop innovative technology based on stated demands of farmers;(ii) disseminate technology by innovative social service models though combined top-down approaches with bottom-up measures to enable smallholders in rural areas. This paper provides a perspective on transformation of small-scale agriculture toward sustainable intensification in china and useful knowledge applicable to other developing countries.

关键词： smallholder farmers sustainable intensification technology innovation technology transfer Science and Technology Backyard

Impacts of soil fauna on nitrogen and phosphorus release during litter decomposition were differently controlled by plant species and ecosystem type

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2019年第3期30卷 921-930页

作者： Yan Peng Wanqin Yang Kai Yue Bo Tan Fuzhong Wu Long-term Research Station of Alpine Forest Ecosystems Provincial Key Laboratory of Ecological Forestry EngineeringInstitute of Ecology and ForestrySichuan Agricultural UniversityChengdu 611130SichuanPeople’s Republic of China Department of Geosciences and Natural Resource Management University of CopenhagenRolighedsvej 231958 Frederiksberg CDenmark Collaborative innovation center for ecological security in the Upper Reaches of the Yangtze River Chengdu 611130 People’s Republic of China

The dynamics of litter nitrogen (N) and phosphorus (P) release could be affected by soil fauna and environmental conditions. The objective of the present study was to investigate the effects of soil fauna on the dynamics of N and P during foliar litter decomposition in three types of ecosystems (i.e., montane forest, ecotone, and dry valley) along an elevation gradient. A field experiment using litterbags with two different mesh sizes (0.04 and 3 mm) was conducted from November 2013 to October 2014. Nitrogen and P release rates in decomposing foliar litter from fir (Abies faxoniana) and birch (Betula albosinensis) in montane forest, oak (Quercus baronii) and cypress (Cupressus chengiana) in ecotone, and cypress and clovershrub (Campylotropis macrocarpa) in dry valley were investigated in the upper reaches of the Yangtze River. Soil fauna strongly affected N and P release across different decomposition periods and ecosystem types. The average release rate of N mediated by soil fauna across the entire year was higher in the dry valley (15.6–37.3%) than in the montane forest (0.5–6.4%) and the ecotone (- 3.7–4.9%). The effects of soil fauna on P release rate were manifest in both the montane forest and the dry valley. Moreover, the impacts of soil fauna can vary substantially among different decomposition periods. Our results indicated that soil fauna can significantly affect N and P release during litter decomposition. The N release rate mediated by fauna was likely to be more sensitive to the effects of plant species (i.e., initial litter chemical traits), while the P release rate mediated by soil fauna might be subject to the effects of local-scale environmental factors (e.g., temperature) to a greater extent.

关键词： Dry valley Ecotone Environmental factors Litterbag Montane forest Release rate

Warming and elevated nitrogen deposition accelerate the invasion process of Solidago canadensis L.

在线全文

学校读者我要写书评

暂无评论

ecological Processes 2022年第1期11卷 890-901页

作者： Guangqian Ren Bin Yang Miaomiao Cui Zhicong Dai Yan Xiang Haiyan Zhang Guanlin Li Jian Li Qaiser Javed Daolin Du Institute of Environment and Ecology Academy of Environmental Health and Ecological SecuritySchool of the Environment and Safety EngineeringJiangsu UniversityZhenjiang 212013China School of Agricultural Engineering Jiangsu UniversityZhenjiang 212013China School of Inspection and Testing Certification Changzhou Vocational Institute of EngineeringChangzhou 213164China Jiangsu Collaborative innovation center of Technology and Material of Water Treatment Suzhou University of Science and TechnologySuzhou 215009China

Background:Invasive species can threaten native diversity and alter ecosystem processes while interacting with other components of global environmental *** plants are becoming increasingly problematic and this can be stimulated by changes in the ***,existing studies have primarily investigated the effects of environmental change on a specific stage of plant invasion rather than the continuous invasion ***:A space-for-time substitution experiment was performed to investigate how warming and nitrogen deposition affects the invasion process of a ***,different ratios of invasive Solidago canadensis *** native Artemisia argyi *** Van were employed as a proxy to represent successive levels of invasion.A total of seven treatments were applied in the experiment:ambient(CK),N addition(+5,+12 g m^(−2)year^(−1)),warming(+1.15,+1.86℃)and their interaction(5 g N m^(−2)year^(−1)+1.15℃,12 g N m^(−2)year^(−1)+1.86℃).The growth performance and competitiveness of *** were ***:The competitiveness of Solidago canadensis decreased linearly with its invasion degree(p<0.05).Non-linear regression showed that *** invasion levels of 53%,53%,68%,55%and 58%were the critical thresholds for shifting the direction or magnitude of chlorophyll,leaf nitrogen,leaf shape index,diameter,and root/shoot ratio,*** with the ambient treatment(CK,no warming and no N addition),the diameter,height,bio-mass and relative competitiveness of *** were each limited by warming,to a certain extent,whereas these and the above parameters were significantly increased by nitrogen *** interaction of increased temperature and nitrogen deposition led to significant increases in the growth and competitiveness of ***,and this effect was detected in every stage of the invasion,throughout the invasion ***:Environmental change might have a continuous,progressive,and augmenta

关键词： Environmental change Phenotypic trait Competitiveness Solidago canadensis L. Invasion process

Anthropogenic land use substantially increases riverine CO_(2) emissions

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第8期34卷 158-170页

作者： Shijie Gu Siyue Li Isaac R.Santos School of River and Ocean Engineering Chongqing Jiaotong UniversityChongqing 400074China Key Laboratory of Reservoir Aquatic Environment Chongqing Institute of Green and Intelligent TechnologyChinese Academy of SciencesChongqing 400714China Chongqing School University of Chinese Academy of SciencesChongqing 400714China Research center for Environmental Ecology and Engineering Institute of Changjiang Water Environment and Ecological SecuritySchool of Environmental Ecology and Biological EngineeringKey Laboratory for Green Chemical Process of Ministry of EducationKey Laboratory of Novel Reactor and Green Chemical Technology of Hubei ProvinceEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationWuhan Institute of TechnologyWuhan 430205China Department of Marine Sciences University of GothenburgGothenburg 41296Sweden National Marine Science Centre Southern Cross UniversityCoffs HarbourNSW 2450Australia

Carbon dioxide(CO_(2)) emissions from inland waters to the atmosphere are a pivotal component of the global carbon budget. Anthropogenic land use can influence riverine CO_(2) emissions, but empirical data exploring cause-effect relationships remain limited. Here, we investigated CO_(2) partial pressures(pCO_(2)) and degassing in a monsoonal river(Yue River)within the Han River draining to the Yangtze in china. Almost 90% of river samples were supersaturated in CO_(2) with a mean ± standard deviation of 1474 ± 1614 μatm, leading to emissions of 557-971 mmol/m^(2)/day from river water to the atmosphere. Annual CO_(2) emissions were 1.6-2.8 times greater than the longitudinal exports of riverine dissolved inorganic and organic carbon. pCO_(2) was positively correlated to anthropogenic land use(urban and farmland), and negatively correlated to forest cover. p CO_(2) also had significant and positive relationships with total dissolved nitrogen and total dissolved phosphorus. Stepwise multiple regression models were developed to predict p CO_(2) . Farmland and urban land released nutrients and organic matter to the river system, driving riverine p CO_(2) enrichment due to enhanced respiration in these heterotrophic rivers. Overall, we show the crucial role of land use driving riverine pCO_(2) , which should be considered in future large-scale estimates of CO_(2) emissions from streams. Land use change can thus modify the carbon balance of urban-river systems by enhancing river emissions, and reforestation helps carbon neutral in rivers.

关键词： River carbon Inland waters Greenhouse gases Climate change Water quality Headwater streams