检索结果-南通市图书馆

Ecosystem Health and Sustainability 2022年第1期8卷 342-351页

作者： Xuan-Shao Liu Jing-Fang Cai Lin Liu Kai Sun Fan Jiang Yi-Luan Shen Si-Ha A Hong-Li Li The key laboratory of ecological protection in the yellow River basin of National Forestry and Grassland Administration School of Ecology and Nature ConservationBeijing Forestry UniversityBeijingChina

Introduction:Propagule pressure(i.e.,the number of propagules)has long been recognized to play an essential role in plant *** it is not clear whether propagule pressure influences the invasion of exotic plants into native plant communities when different frequencies of nitrogen are ***:We established an experiment with three plant communities that included native plant communities alone(four grasses,two legumes and two forbs)or native plant communities with one or five invasive plants,Solidago canadensis,under three frequencies of nitrogen addition(no addition or low or high addition with the same amount).Results:High propagule pressure significantly enhanced the biomass and relative dominance index of ***,high propagule pressure only decreased the total and aboveground biomass of the ***,the competitive effect between *** and the native community and biomass of the whole native community varied according to different ***:Overall,high propagule pressure encouraged invasion by ***,while alow nitrogen frequency was advantageous for the native community to resist invasion in this *** results provide a scientific basis to manage and control the invasion of ***.

关键词： clonal plants invasiveness nitrogen addition level propagule number

Response of vegetation phenology to climate factors in the source region of the Yangtze and yellow Rivers

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 2024年第5期17卷 141-156页

作者： Qingqing Jiang Zhe Yuan Jun Yin Mingze Yao Tianling Qin Xizhi Lü Guangdong Wu Department of Geographical Sciences Faculty of Resources and Environmental ScienceHubei UniversityWuhan 430062China Changjiang River Scientific Research Institute Changjiang Water Resources Commission of the Ministry of Water Resources of ChinaWuhan 4430010China State key laboratory of Simulation and Regulation of Water Cycle in River basin China Institute of Water Resources and Hydropower ResearchBeijing 100038China henan key laboratory of yellow basin ecological protection and restoration Yellow River Institute of Hydraulic ResearchZhengzhou 450003China

Exploring the impact of climate factors on vegetation phenology is crucial to understanding climate–vegetation interactions as well as carbon and water cycles in ecosystems in the context of climate *** this article,we extracted the vegetation phenology data from 2002 to 2021 based on the dynamic threshold method in the source region of the Yangtze and yellow *** and correlation analyses were used to investigate the relationship between vegetation phenology and temperature,precipitation and their spatial evolution *** results showed that:(i)From 2002 to 2021,the multi-year average start of growing season(SOS),end of growing season(EOS)and length of growing season(LOS)for plants were concentrated in May,October and 4–6 months,with a trend of 4.9 days(earlier),1.5 days(later),6.3 days/10 a(longer),respectively.(ii)For every 100 m increase in elevation,SOS,EOS and LOS were correspondingly delayed by 1.8 days,advanced by 0.8 days and shortened by 2.6 days,respectively.(iii)The impacts of temperature and precipitation on vegetation phenology varied at different stages of vegetation *** factors of spring phenology experienced a shift from temperature to precipitation,while autumn phenology experienced precipitation followed by temperature.(iv)The climate factors in the previous period significantly affected the vegetation phenology in the study area and the spatial variability was ***,the temperature in April significantly affected the spring phenology and precipitation in August widely affected the autumn phenology.

关键词： vegetation phenology climate factor spatiotemporal evolution terrain the source region of the Yangtze and yellow Rivers

Comparing the temperature sensitivity of organic matter decomposition in oxic and oxygen-deprived soils

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 Ecology Letters 2024年第1期6卷 29-32页

作者： Zhenhui Jiang Xin Wang Ting Liu Xiaojuan Feng State key laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeiing 100093China University of Chinese Academy of Sciences Bejing 100049China State key laboratory of Subtropical Silviculture Zhejiang A&F UniversityHangzhou 311300China henan key laboratory of ecological Environment protection and restoration of yellow River basin Yellow River Institute of Hydraulic ResearchZhengzhou 450003China

No consistent variation was found in soil respiration Q10 under various O2 *** C quality had a strong effect on Q10 in oxic soils.N limitation had a large impact on Q10 in soils under O2 *** studies on the temperature sensitivity(Q10)of soil organic matter(SOM)decomposition mainly focus on aerobic ***,varia-tions and determinants of Q10 in oxygen(O2)-deprived soils remain *** we incubated three grassland soils under oxic,suboxic,and anoxic conditions subjected to varying temperatures to compare variations in Q10 in relation to changing *** consistent variation was found in Q10 under various O2 *** analysis of edaphic properties demon-strated that substrate carbon quality showed a strong influence on Q10 in oxic soils,whereas nitrogen limitation played a more important role in suboxic and anoxic *** results suggest that substrate carbon quality and nitrogen limitation may play roles of varying importance in determining the temperature sensitivity of SOM decomposition under various O2 conditions.

关键词： oxygen-limited conditions temperature sensitivity soil respiration carbon substrate nitrogen limitation

Effect of Hydrological Connectivity on Soil Carbon Storage in the yellow River Delta Wetlands of China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Geographical Science 2021年第2期31卷 197-208页

作者： FENG Jiuge LIANG Jinfeng LI Qianwei ZHANG Xiaoya YUE Yi GAO Junqin School of Ecology and Nature Conservation Beijing Forestry UniversityBeijing 100083China State key laboratory of Water Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 100875China The key laboratory of ecological protection in the yellow River basin of National Forestry and Grassland Administration

Hydrological connectivity has significant effects on the functions of estuarine wetland *** study aimed to examine the dynamics of hydrological connectivity and its impact on soil carbon pool in the yellow River Delta,*** calculated the hydrological connectivity based on the hydraulic resistance and graph theory,and measured soil total carbon and organic carbon under four different hydrological connectivity gradients(Ⅰ0‒0.03,Ⅱ0.03‒0.06,Ⅲ0.06‒0.12,Ⅳ0.12‒0.39).The results showed that hydrological connectivity increased in the north shore of the yellow River and the south tidal flat from 2007 to 2018,which concentrated in the mainstream of the yellow River and the tidal *** hydrological connectivity was maintained in the wetland restoration *** soil total carbon storage and organic carbon storage significantly increased with increasing hydrological connectivity fromⅠtoⅢgradient and decreased inⅣ*** highest soil total carbon storage of 0‒30 cm depth was 5172.34 g/m^(2),and organic carbon storage 2764.31 g/m^(2)inⅢ*** hydrological connectivity changed with temporal and spatial change during 2007‒2018 and had a noticeable impact on soil carbon storage in the yellow River *** results indicated that appropriate hydrological connectivity,i.e.0.08,could effectively promote soil carbon storage.

关键词： coastal wetland hydrological connectivity soil carbon carbon storage spatiotemporal variation the yellow River Delta

The Overwintering Capability of Ulva prolifera Spores and Gametes in the yellow Sea,China

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

Journal of Ocean University of China 2023年第2期22卷 509-516页

作者： HAN Hongbin ZHAO Sheng SONG Xiaoli WANG Hui North China Sea ecological Center of the Ministry of Natural Resources Qingdao 266033China key laboratory of ecological Prewarning Protection and Restoration of Bohai SeaMinistry of Natural ResourcesQingdao 266033China

Green tides caused by the bloom of Ulva prolifera have affected the yellow Sea annually since *** explore the intrinsic causes of successive blooms,field investigations and indoor simulation experiments were conducted using micro-propagules of *** January to February 2014,micro-propagules of various green algae,including ***,Ulva flexuosa,and Ulva linza,were prevalent in the coastal waters of Rudong,Lianyungang,and ***,in March 2014,micro-propagules of *** were not detected in the coastal waters of Lianyungang and *** the spores nor gametes of *** can germinate at temperatures below 5℃.At 2℃and 5℃,*** spores and gametes could survive for 1-3 months at a light intensity range of 0-30μmol m^(-2)s^(-1)and for less than 1 month if the light intensity exceeded 30μmol m^(-2)s^(-1).By integrating indoor experiments and field investigations,this study found that *** spores and gametes could overwinter in the Rudong coastal area,which is an important factor for the annual emergence of recurring green tides in the yellow Sea.

关键词： green tides U.prolifera spores gametes micro-propagules overwinter

Soil microbial communities regulate the threshold effect of salinity stress on SOM decomposition in coastal salt marshes

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

Fundamental Research 2023年第6期3卷 868-879页

作者： Guangliang Zhang Junhong Bai Jia Jia Wei Wang Dawei Wang Qingqing Zhao Chen Wang Guozhu Chen State key laboratory of Water Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 100875China Advanced Institute of Natural Sciences Beijing Normal UniversityZhuhai 519087China henan key laboratory of ecological Environment protection and restoration of yellow River basin Yellow River Institute of Hydraulic ResearchZhengzhou 450003China Shandong Provincial key laboratory of Applied Microbiology Ecology InstituteQilu University of Technology(Shandong Academy of Sciences)Ji'nan 250103China

Salinity stress is one of the critical environmental drivers of soil organic matter(SOM)decomposition in coastal *** the temperature sensitivity(Q_(10))of SOM decomposition has been widely applied in Earth system models to forecast carbon processes,the impact of salinity on SOM decomposition by restructuring microbial communities remains ***,we conducted a microcosm experiment with soils collected from the coastal salt marsh in the yellow River Estuary,which is subjected to strong dynamics of salinity due to both tidal flooding and *** setting a gradient of salt solutions,soil salinity was adjusted to simulate salinity stress and soil carbon emission(CO_(2))rate was measured over the *** showed that as salinity increased,the estimated decomposition constants based on first-order kinetics gradually decreased at different *** the 20‰salinity treatments,which doubled the soil salinity,Q_(10)increased with increasing salinity;but higher salinity constrained the temperature-related response of SOM decomposition by inhibiting microbial growth and carbon *** bacteria were more sensitive to salinity stress than fungi,which can be inferred from the response of microbial beta-diversity to changing *** them,the phylotypes assigned to Gammaproteobacteria and Bacilli showed higher salt tolerance,whereas taxa affiliated with Alphaproteobacteria and Bacteroidota were more easily inhibited by the salinity *** fungal taxa belonging to Ascomycota had higher adaptability to the *** the substrate was consumed with the incubation,bacterial competition intensified,but the fungal co-occurrence pattern changed weakly during ***,these findings revealed the threshold effect of salinity on SOM decomposition in coastal salt marshes and emphasized that salt stress plays a key role in carbon sequestration by regulating microbial keystone taxa,metabolisms,and interactions.

关键词： Salt marshes Salinity stress Soil organic matter decomposition Temperature sensitivity Threshold effect Microbial community

Soil macropores induced by plant root as a driver for vertical hydrological connectivity in yellow River Delta

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 2024年第5期17卷 40-51页

作者： Lumeng Xie Jiakai Liu Yi Li Peisheng Huang Matt Hipsey Mingxiang Zhang Zhenming Zhang School of Ecology and Nature Conservation Beijing Forestry UniversityBeijing 100083China The key laboratory of ecological protection in the yellow River basin of National Forestry and Grassland Administration Beijing 100083China Centre for Water and Spatial Science School of Agriculture and EnvironmentThe University of Western AustraliaPerth 6009WAAustralia

The protection and management of the wetland should consider the changes in hydrological connectivity(HC)caused by the structural modifications of the soil *** main purpose of our work is to clarify and quantify the influence of the soil macropores volume on the vertical soil hydrodynamic process mechanically and statistically by taking the form of a case study in yellow River Delta(YRD),and further reveal the vertical hydrological connectivity in this *** on X-ray computed tomography and constant head permeability test,the results showed a highly spatial heterogeneity of the soil structure in the YRD,hydraulic parameter(K_(s))was negatively correlated with bulk density and positively with soil macropore volume,soil aeration and maximum water *** Hydrus 1-D software and the Green–Ampt model,we estimated the characteristics of the hydrodynamic process in the soil without macropores,then evaluated the effect of the soil macropore on soil hydrodynamic process by comparing the experimental results with the simulation *** found that increasing soil microporosity improved the convenience of water movement,which would enhance the HC of the *** results will further help to reveal the eco-hydrological process at a vertical scale in soil and provide a theoretical guide for wetland conservation and restoration.

关键词： soil macropore soil hydrodynamics hydrological connectivity wetland restoration yellow River Delta

A New Species of Glyphoglossus Günther,1869(Anura:Microhylidae) from Western Yunnan,China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Herpetological Research 2021年第4期12卷 371-380页

作者： Dongru ZHANG Shuo LIU Lixia ZHANG Hong HUI Heng XIAO Dingqi RAO State key laboratory of Genetic Resources and Evolution Kunming Institute of ZoologyChinese Academy of SciencesKunming 650223YunanChina Colege of Life Sciences Yunnan UniversityKunming 650091YunanChina Kunming Natural History Museum of Zoology Kunming Institute of ZoologyChinese Academy of SciencesKunming 650223YunanChina Department of Ecology College of Life SciencesHenan Normal UniversityXinxiang 453007HenanChina Research Center for ecological management and protection of the yellow River basin Xinxiang 453007HenanChina

A new species of microhylid frog of the genus Glyphoglossus Gunther,1869 is described from Huadianba,Cangshan Mountain,Dali Bai Autonomous Prefecture,Yunnan Province,*** huadianensis,new species,is compared with congeners from China and other parts of Southeast Asia,and was distinguished from the others by the following combination of characters:adult male body size up to 37.8 mm;pupil rounded;supra tympanic fold distinct;tympanum concealed;toe tips obtuse;subarticular tubercles prominent and rounded;foot webbing extensive;outer metatarsal tubercle present;dorsum tuberculate,yellowish-brown/earth-yellow;and a pair of conspicuous large round spots in *** new species is the tenth species of Glyphoglossus to be described,and the second known from China.

关键词： Glyphoglossus huadianensis sp.n. taxonomy morphology China

Automatic segmentation algorithm for high-spatial-resolution remote sensing images based on self-learning super-pixel convolutional network

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

International Journal of Digital Earth 2022年第1期15卷 1101-1124页

作者： Zenan Yang Haipeng Niu Liang Huang Xiaoxuan Wang Liangxin Fan Dongyang Xiao School of Surveying and Land Information Engineering Henan Polytechnic UniversityJiaozuoHenanPeople’s Republic of China Research Centre of Arable Land protection and Urban-rural High-quality Development of of yellow River basin HenanPeople’s Republic of China Faculty of Land Resources Engineering Kunming University of Science and TechnologyKunmingPeople’s Republic of China Surveying and Mapping Geo-Informatics Technology Research Center on Plateau Mountains of Yunnan Higher Education KunmingPeople’s Republic of China key laboratory of Spatio-temporal Information and ecological restoration of Mines of Natural Resources of the People's Republic of China Henan Polytechnic UniversityJiaozuoPeople’s Republic of China

Super-pixel algorithms based on convolutional neural networks with fuzzy C-means clustering are widely used for high-spatial-resolution remote sensing images ***,this model requires the number of clusters to be set manually,resulting in a low automation degree due to the complexity of the iterative clustering *** address this problem,a segmentation method based on a self-learning super-pixel network(SLSP-Net)and modified automatic fuzzy clustering(MAFC)is ***-Net performs feature extraction,non-iterative clustering,and gradient reconstruction.A lightweight feature embedder is adopted for feature extraction,thus expanding the receiving range and generating multi-scale *** matching is used for non-iterative clustering,and the overfitting of the network model is overcome by adaptively adjusting the gradient weight parameters,providing a better irregular super-pixel neighborhood *** optimized density peak algorithm is adopted for *** on the obtained super-pixel image,this maximizes the robust decision-making interval,which enhances the automation of regional ***,prior entropy fuzzy C-means clustering is applied to optimize the robust decision-making and obtain the final segmentation *** results show that the proposed model offers reduced experimental complexity and achieves good performance,realizing not only automatic image segmentation,but also good segmentation results.

关键词： Deep convolution neural network model super-pixel algorithm automatic fuzzy clustering prior entropy fuzzy C-Means clustering algorithm remote sensing images

Medium distribution, source characteristics and ecological risk of bisphenol compounds in agricultural environment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Emerging Contaminants 2024年第2期10卷 65-75页

作者： Yihao Qin Jianchao Liu Lei Han Jinghua Ren Chenyang Jing Guanghua Lu Xinming Yang key laboratory of Integrated Regulation and Resource Development of Shallow Lakes of Ministry of Education Hohai UniversityNanjing210098China College of Environment Hohai UniversityNanjing210098China Jinan Environmental Research Institute(Jinan yellow River basin ecological protection Promotion Center) JinanChina Technology Innovation Center for ecological Monitoring&restoration Project on Land(arable) Ministry of Natural Resources Geological Survey of Jiangsu ProvinceNanjing210018China

Bisphenol compounds(BPs)are commonly used in industry and ***,BPs pollution has already raised global concerns due to their ecological *** study investigated nine types of BPs in agricultural soil and irrigation rivers,and evaluated the occurrence,source apportionment,and ecological risks for BPs in soils of agricultural environment by using principal component analysis-multivariate linear regression(PCA-MLR)and risk quotients(RQ).The average concentration of BPs in soil,irrigation water and sediments were 29.19 ng/g,30.21 ng/L and 610.09 ng/g dw,*** was the most highly detected contaminant in all *** soil,the primary BPA substitutes were bisphenol S(BPS)and bisphenol F(BPF),contributing about 50%to the pollution in ***-MLR analysis indicated that the release of solid waste was the primary cause of BPs pollution in the agricultural soils,following by waste water *** evaluation of RQ revealed that BPs presented a low to medium risk to algae,daphnia,and fish in irrigation rivers,while more than 90% of soil sampling sites faced medium or high risk,with BPA and BPS as the main contributors to the *** research findings offer evidence to support the assessment of contaminants concentration,source pathways,and risk management strategies pertaining to BPs in the agricultural *** ongoing BPA substitute occurrence,addressing risks to agricultural soil ecosystems remains crucial.

关键词： Bisphenol compounds Soil Irrigation rivers ecological risks