LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 37

Search options

  1. Article ; Online: Temporal and spatial variations of ecological security on the northeastern Tibetan Plateau integrating ecosystem health-risk-services framework

    Chenli Liu / Wenlong Li / Jing Xu / Huakun Zhou / Wenying Wang / Hong Wang

    Ecological Indicators, Vol 158, Iss , Pp 111365- (2024)

    1481  

    Abstract: Ecological security is a critical guarantor of human security and indeed human survival and is closely associated with sustainable development. Yet exploration of ecological security assessment in alpine pastoral regions is lacking, and many studies have ...

    Abstract Ecological security is a critical guarantor of human security and indeed human survival and is closely associated with sustainable development. Yet exploration of ecological security assessment in alpine pastoral regions is lacking, and many studies have failed to perform validation analyses on ecological security assessment results, weakening the reliability of their assessment results. In this study, an ecosystem health-risk-services framework is developed to assess the ecological security of the Gannan alpine pastoral region (GAPR) on the northeastern Tibetan Plateau from 2000 to 2020. Then, the remote sensing ecological index (RSEI) and high-resolution images are then introduced to verify and compare the results’ reliability. Our study results indicate: (1) The assessment framework can better reflect the actual ecological security state in GAPR, and the correlation coefficient (R2) of the comprehensive ecological security index (CESI) and RSEI is between 0.426 and 0.555 (p < 0.001). (2) The CESI value of GAPR shows a fluctuating and increasing trend from 2000 to 2020, with a spatial distribution pattern of high values in the south and low values in the north. The ecological security levels in GAPR are dominated by medium, medium-high and high security levels. (3) The centers of gravity of low and medium-low security levels show a northward movement trend, while that of medium-high and high security levels show a southward movement. Our framework provides a new perspective for ecological security assessment methods, which can be extended to other regions, and the results contribute useful references to decision-makers for socioeconomic development and eco-environmental protection in GAPR.
    Keywords Ecological security ; BPSR model ; Ecological sensitivity ; InVEST model ; RSEI ; Gravity center migration model ; Ecology ; QH540-549.5
    Subject code 910
    Language English
    Publishing date 2024-01-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  2. Article ; Online: The Influence of Climate Change on Three Dominant Alpine Species under Different Scenarios on the Qinghai–Tibetan Plateau

    Huawei Hu / Yanqiang Wei / Wenying Wang / Chunya Wang

    Diversity, Vol 13, Iss 682, p

    2021  Volume 682

    Abstract: The Qinghai–Tibetan Plateau (QTP) with high altitude and low temperature is one of the most sensitive areas to climate change and has recently experienced continuous warming. The species distribution on the QTP has undergone significant changes ... ...

    Abstract The Qinghai–Tibetan Plateau (QTP) with high altitude and low temperature is one of the most sensitive areas to climate change and has recently experienced continuous warming. The species distribution on the QTP has undergone significant changes especially an upward shift with global warming in the past decades. In this study, two dominant trees ( Picea crassifolia Kom and Sabina przewalskii Kom) and one dominant shrub ( Potentilla parvifolia Fisch) were selected and their potential distributions using the MaxEnt model during three periods (current, the 2050s and the 2070s) were predicted. The predictions were based on four shared socio-economic pathway (SSPs) scenarios, namely, SSP2.6, SSP4.5, SSP7.0, SSP8.5. The predicted current potential distribution of three species was basically located in the northeastern of QTP, and the distribution of three species was most impacted by aspect, elevation, temperature seasonality, annual precipitation, precipitation of driest month, Subsoil CEC (clay), Subsoil bulk density and Subsoil CEC (soil). There were significant differences in the potential distribution of three species under four climate scenarios in the 2050s and 2070s including expanding, shifting, and shrinking. The total suitable habitat for Picea crassifolia shrank under SSP2.6, SSP4.5, SSP7.0 and enlarged under SSP8.5 in the 2070s. On the contrary, the total suitable habitat for Sabina przewalskii enlarged under SSP2.6, SSP4.5, SSP7.0 and shrank under SSP8.5 in the 2070s. The total suitable habitat for Potentilla parvifolia continued to increase with SSP2.6 to SSP8.5 in the 2070s. The average elevation in potentially suitable habitat for Potentilla parvifolia all increased except under SSP8.5 in the 2050s. Our study provides an important reference for the conservation of Picea crassifolia , Sabina przewalskii , Potentilla parvifolia and other dominant plant species on the QTP under future climate change.
    Keywords climate change ; potential distribution ; MaxEnt model ; suitable habitat ; average elevation ; Biology (General) ; QH301-705.5
    Subject code 550
    Language English
    Publishing date 2021-12-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  3. Article: Ammonia volatilisation and N recovery of nitrogen fertiliser on former alpine grassland based on a nitrogen isotope labelling technique

    Pan, Liu / Wenying, Wang / Huakun, Zhou / Chong, Yang

    Acta agriculturæ Scandinavica. 2021 Aug. 18, v. 71, no. 6

    2021  

    Abstract: Nitrogen fertiliser application can effectively increase the net primary productivity (NPP) of agriculture and grassland ecosystems. There is some long-term retention of nitrogen applied to soils, but much is lost to runoff, to in situ denitrification ... ...

    Abstract Nitrogen fertiliser application can effectively increase the net primary productivity (NPP) of agriculture and grassland ecosystems. There is some long-term retention of nitrogen applied to soils, but much is lost to runoff, to in situ denitrification and to gaseous forms of nitrogen (such as NH₃ and NOX). So it is particularly important to improve nitrogen-use efficiency through various ways. Therefore, the effects of the urea with urease inhibitor N-(n-butyl)thiophosphoric triamide (NBPT) or/and nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) on the NPP, NH₃ and ¹⁵N recovery were researched on the alpine grassland ecosystem. The results showed that the addition NBPT to urea can significantly reduce the cumulative NH₃ emission of urea-N compared with urea alone. The NBPT or DMPP addition to urea significantly increased the above-ground NPP and the economic efficiency. Urea added to NBPT or NBPT+DMPP could increase the ¹⁵N recovery rate of plant and soil (0-40 cm) by nearly 20%. The results indicated that urea combined with DMPP may be a good way to nitrogen fertiliser retention and reduction of NH₃ emission for the alpine grassland of the northeast of the Qinghai-Tibet Plateau.
    Keywords 3,4-dimethylpyrazole phosphate ; alpine grasslands ; ammonia ; denitrification ; ecosystems ; fertilizer application ; net primary productivity ; nitrification inhibitors ; nitrogen ; nitrogen fertilizers ; nutrient use efficiency ; runoff ; soil ; urea ; urea nitrogen ; urease inhibitors ; volatilization ; China
    Language English
    Dates of publication 2021-0818
    Size p. 423-431.
    Publishing place Taylor & Francis
    Document type Article
    ZDB-ID 32458-9
    ISSN 1651-1913 ; 0906-4710
    ISSN (online) 1651-1913
    ISSN 0906-4710
    DOI 10.1080/09064710.2021.1900382
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

  4. Article ; Online: Calreticulin Identified as One of the Androgen Response Genes That Trigger Full Regeneration of the Only Capable Mammalian Organ, the Deer Antler

    Qianqian Guo / Junjun Zheng / Hengxing Ba / Hongmei Sun / Jingjie Zhai / Wenying Wang / Chunyi Li

    Frontiers in Cell and Developmental Biology, Vol

    2022  Volume 10

    Abstract: Deer antlers are male secondary sexual characters that develop to become bone; they are unique appendages that, once lost, can fully regenerate from the permanent bony protuberances or pedicles. Pedicle periosteum (PP) is the tissue that gives rise to ... ...

    Abstract Deer antlers are male secondary sexual characters that develop to become bone; they are unique appendages that, once lost, can fully regenerate from the permanent bony protuberances or pedicles. Pedicle periosteum (PP) is the tissue that gives rise to the regenerating antlers with three differentiation stages, namely, dormant (DoPP), potentiated (PoPP), and activated (AcPP). Thus far, the transition from the PoPP to the AcPP has not been studied. Our results showed that the AcPP cells maintained their original stem cell features by expressing mesenchymal stem cell (MSC) markers CD73, CD90, and CD105, although they had entered the proliferation mode. The differentially expressed genes (DEGs) in the AcPP compared with those of the PoPP were mainly involved in protein processing, cell cycle, and calcium signaling pathways. Calreticulin (CALR), an androgen response gene, was significantly differentially upregulated in the AcPP cells, and its expression level was negatively regulated by androgens, in contrast to the currently known model systems where all regulation is positive. The downregulation of CALR expression in the AcPP cells in vitro inhibited cell proliferation, induced apoptosis, and inhibited cell cycle progression at G1-S transition. Therefore, CALR is likely a downstream mediator of androgen hormones for triggering initiation of antler regeneration. We believe that the identification of CALR has not only discovered “one critical piece” of the “jigsaw puzzle” in the initiation of antler regeneration but also helps in revealing the mechanism underlying this unique mammalian epimorphic regeneration and has also opened a new avenue for the study of the nature of CALR regulation by androgen (putative binding partners), thus facilitating the identification of potential molecule(s) for investigation as targets for clinical evaluation.
    Keywords antler regeneration ; calreticulin ; androgen response gene ; antler stem cells ; RNAi ; Biology (General) ; QH301-705.5
    Subject code 570 ; 571
    Language English
    Publishing date 2022-06-01T00:00:00Z
    Publisher Frontiers Media S.A.
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  5. Article ; Online: Land Use/Land Cover Mapping Based on GEE for the Monitoring of Changes in Ecosystem Types in the Upper Yellow River Basin over the Tibetan Plateau

    Senyao Feng / Wenlong Li / Jing Xu / Tiangang Liang / Xuanlong Ma / Wenying Wang / Hongyan Yu

    Remote Sensing, Vol 14, Iss 5361, p

    2022  Volume 5361

    Abstract: The upper Yellow River basin over the Tibetan Plateau (TP) is an important ecological barrier in northwestern China. Effective LULC products that enable the monitoring of changes in regional ecosystem types are of great importance for their environmental ...

    Abstract The upper Yellow River basin over the Tibetan Plateau (TP) is an important ecological barrier in northwestern China. Effective LULC products that enable the monitoring of changes in regional ecosystem types are of great importance for their environmental protection and macro-control. Here, we combined an 18-class LULC classification scheme based on ecosystem types with Sentinel-2 imagery, the Google Earth Engine (GEE) platform, and the random forest method to present new LULC products with a spatial resolution of 10 m in 2018 and 2020 for the upper Yellow River Basin over the TP and conducted monitoring of changes in ecosystem types. The results indicated that: (1) In 2018 and 2020, the overall accuracy (OA) of LULC maps ranged between 87.45% and 93.02%. (2) Grassland was the main LULC first-degree class in the research area, followed by wetland and water bodies and barren land. For the LULC second-degree class, the main LULC was grassland, followed by broadleaf shrub and marsh. (3) In the first-degree class of changes in ecosystem types, the largest area of progressive succession (positive) was grassland–shrubland (451.13 km 2 ), whereas the largest area of retrogressive succession (negative) was grassland–barren (395.91 km 2 ). In the second-degree class, the largest areas of progressive succession (positive) were grassland–broadleaf shrub (344.68 km 2 ) and desert land–grassland (302.02 km 2 ), whereas the largest areas of retrogressive succession (negative) were broadleaf shrubland–grassland (309.08 km 2 ) and grassland–bare rock (193.89 km 2 ). The northern and southwestern parts of the study area showed a trend towards positive succession, whereas the south-central Huangnan, northeastern Gannan, and central Aba Prefectures showed signs of retrogressive succession in their changes in ecosystem types. The purpose of this study was to provide basis data for basin-scale ecosystem monitoring and analysis with more detailed categories and reliable accuracy.
    Keywords Google Earth Engine ; land use/land cover mapping ; machine learning ; upper Yellow River basin ; Sentinel-2 ; ecosystem types ; Science ; Q
    Subject code 333
    Language English
    Publishing date 2022-10-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  6. Article ; Online: Plant-Soil Mediated Effects of Long-Term Warming on Soil Nematodes of Alpine Meadows on the Qinghai–Tibetan Plateau

    Yanfang Liu / Wenying Wang / Pan Liu / Huakun Zhou / Zhe Chen / Ji Suonan

    Biology, Vol 11, Iss 1596, p

    2022  Volume 1596

    Abstract: Global warming is one of the most pressing environmental issues today. Our study aimed to investigate how warming affected plant and soil nematode communities in alpine meadows on the Qinghai–Tibetan Plateau over the past seven years. An artificial ... ...

    Abstract Global warming is one of the most pressing environmental issues today. Our study aimed to investigate how warming affected plant and soil nematode communities in alpine meadows on the Qinghai–Tibetan Plateau over the past seven years. An artificial warming experiment with different gradients was conducted from 2011 to 2018, including temperature increases of 0 °C (CK), 0.53 °C (A), 1.15 °C (B), 2.07 °C (C), and 2.17 °C (D), respectively. Cyperaceae plants were shown to be eliminated by increasing temperature, and plant community composition tended to cluster differently under different warming gradients. The number of nematodes decreased with the increase in soil depth, and the majority of them were observed in the topsoil layer. The individual densities of soil nematodes were 197 ind.·100 g −1 dry soil at 10–20 cm and 188 ind.·100 g −1 dry soil at 20–30 cm in the A treatment, which was significantly higher than the CK (53 and 67 ind.·100 g −1 dry soil) ( p < 0.05). The lowest relative abundance of bacterivore nematodes (Ba) was 31.31% in treatment A and reached the highest of 47.14% under the warming gradient of D ( p < 0.05). The abundance of plant parasitic nematodes (Pp) was significantly reduced to 26.03% by excessive warming (2.17 °C increase) in comparison to CK (41.65%). The soil nematode community had the highest diversity with a 0.53 °C increase in soil temperature; 1.15 °C warming gradients were lower, and nematode communities tended to be simplified ( p < 0.05). All nematode channel ratio (NCR) values were above 0.5, indicating that warming did not change the decomposition pathway of soil organic matter dominated by the bacterial channels. The Wasilewska Index (WI) in the D treatment increased significantly compared to other treatments ( p < 0.05), indicating that the mineralized pathway of the food web was primarily involved with Ba and fungivores nematodes (Fu), which is conducive to the growth of micro-biophagous nematodes. The plant parasite index (PPI) decreased significantly in the ...
    Keywords climate warming ; plant diversity ; soil nematode communities ; Qinghai–Tibetan Plateau ; Biology (General) ; QH301-705.5
    Language English
    Publishing date 2022-10-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  7. Article ; Online: Global trends and characteristics of ecological security research in the early 21st century

    Chenli Liu / Wenlong Li / Jing Xu / Huakun Zhou / Changhui Li / Wenying Wang

    Ecological Indicators, Vol 137, Iss , Pp 108734- (2022)

    A literature review and bibliometric analysis

    2022  

    Abstract: With the worsening of global and local environmental problems, ecological security has a vital role to play in sustainable development, and has become a worldwide topic of concern in the 21st century. This study used bibliometric analysis to ... ...

    Abstract With the worsening of global and local environmental problems, ecological security has a vital role to play in sustainable development, and has become a worldwide topic of concern in the 21st century. This study used bibliometric analysis to comprehensively review the progress of global research in ecological security from 2000 to 2020 to provide an overview for future directions. We analyzed 761 publications related to ecological security from this period, covering 34 countries, 370 journals, 631 institutions, 585 funding agencies, and 2680 authors. The results showed that the majority of publications (71.75%) appeared from 2014 to 2020, with research conducted mostly in China, followed by the USA and Russia. The top 10 active institutions were all Chinese; the Chinese Academy of Sciences was the most productive institution, and also had the highest number of citations. China was at the center of the international cooperation network, with the highest collaboration with the USA, Australia, and Canada. Funding from the National Natural Science Foundation of China (NSFC) has supported the highest number of publications. The top two productive journals in this area were Sustainability and Ecological Indicators. Keyword co-occurrence and frequency analysis showed that “ecological security patterns,” “ecosystem services,” “ecological security assessment,” “sustainable development,” and “land use change” were the main topics, whereas “GIS,” “PSR model,” “ecological footprint,” “remote sensing,” “MCR model,” and “DPSIR model” were the most commonly used research technologies and models. Our findings showed that the focal topics have switched from ecological security assessment to ecological security patterns. We believe that these results would contribute to practitioners’ and researchers’ better understanding of worldwide ecological security research and facilitate future investigations.
    Keywords Ecological security ; Knowledge mapping ; Research hotspots ; Bibliometric analysis ; VOSviewer ; Ecology ; QH540-549.5
    Subject code 001
    Language English
    Publishing date 2022-04-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  8. Article ; Online: Postoperative ratio of C-reactive protein to albumin is an independent prognostic factor for gastric cancer

    Chenxi Li / Xuhui Yang / Hui Li / Yan Fu / Wenying Wang / Xin Jin / Lihua Bian / Liang Peng

    European Journal of Medical Research, Vol 28, Iss 1, Pp 1-

    2023  Volume 8

    Abstract: Objective The role of postoperative of the ratio of c-reactive protein to albumin (CRP/Alb ratio) in the prognosis of gastric cancer is rarely evaluated. Our purpose was to investigate the correlation of the postoperative CRP/Alb ratio and long-term ... ...

    Abstract Objective The role of postoperative of the ratio of c-reactive protein to albumin (CRP/Alb ratio) in the prognosis of gastric cancer is rarely evaluated. Our purpose was to investigate the correlation of the postoperative CRP/Alb ratio and long-term prognosis of gastric cancer. Methods We enrolled 430 patients who suffered from radical gastrectomy. The commonly used inflammatory indices, clinical-pathological characteristics and oncologic outcomes were recorded. The median was used to the cut-off value for preoperative and postoperative CRP/Alb ratio, respectively. Kaplan–Meier analysis and Cox proportional hazards regression model were performed to determine its prognostic significance. Results In univariate analysis, there were significant differences were observed in overall survival (OS) according to perioperative CRP/Alb ratio, c-reactive protein (CRP), serum albumin (Alb), respectively. According to the multivariate analysis, higher postoperative CRP/Alb ratio (HR 2.03, 95% CI 1.55–2.66, P < 0.001), lower postoperative albumin (Alb), higher preoperative c-reactive protein (CRP) and higher postoperative CRP were indicated a shorter overall survival. Conclusion Postoperative inflammatory factors in patients with gastric cancer should be pay attention, especially postoperative CRP/Alb ratio may be an independent predictor of long-term prognosis of gastric cancer.
    Keywords Preoperative CRP/Alb ratio ; Postoperative CRP/Alb ratio ; Gastric cancer ; Prognosis ; Overall survival ; Medicine ; R
    Language English
    Publishing date 2023-09-01T00:00:00Z
    Publisher BMC
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  9. Article ; Online: Impact of Industrial Pollution of Cadmium on Traditional Crop Planting Areas and Land Management

    Yu Song / Wenlong Li / Yating Xue / Huakun Zhou / Wenying Wang / Chenli Liu

    Land, Vol 10, Iss 1364, p

    A Case Study in Northwest China

    2021  Volume 1364

    Abstract: Cadmium in soils not only reduces crop yield and quality but also threatens the safety of human health and wildlife due to bioaccumulation. Baiyin City, a typical industrial region located in northwest China, was evaluated to examine the spatial ... ...

    Abstract Cadmium in soils not only reduces crop yield and quality but also threatens the safety of human health and wildlife due to bioaccumulation. Baiyin City, a typical industrial region located in northwest China, was evaluated to examine the spatial distribution of cadmium. We simulated soil cadmium concentrations in the laboratory, based on levels found at local sampling sites, to examine how both Medicago sativa and Zea mays plants accumulate cadmium. The experimental results revealed that cadmium in all soil samples exceeded China’s national standard levels for general farmland; in addition, cadmium accumulation in all tissues of M. sativa and Z. mays exceeded the national fodder standards. Therefore, M. sativa and Z. mays from the study area should not be used for fodder. However, about 36% of the planting area of M. sativa and Z. mays can be used for phytoextraction because of cadmium accumulation. For soil pollution management, we suggest dividing the study area into three different regions, including a non-planting region, a phytoremediation region, and a planting region. Our soil management model can effectively help local people to avoid food safety risks and to realize sustainable development of soil utilization in contaminated areas.
    Keywords soil pollution ; cadmium ; food safety ; spatial distribution ; GIS spatial threshold analysis ; Agriculture ; S
    Language English
    Publishing date 2021-12-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  10. Article ; Online: Relationship between Cognitive Learning Psychological Classification and Neural Network Design Elements

    Xing Yang / Tingjun Yong / Meihua Li / Wenying Wang / Huichun Xie / Jinping Du

    Complexity, Vol

    2021  Volume 2021

    Abstract: This article first analyzes the research background of the design elements of cognitive psychology and neural networks at home and abroad, roughly understands the research status and research background of these two courses at home and abroad, and ... ...

    Abstract This article first analyzes the research background of the design elements of cognitive psychology and neural networks at home and abroad, roughly understands the research status and research background of these two courses at home and abroad, and discusses the application of cognitive psychology to neural networks. The design method has not yet formed a systematic theoretical system. Then, a systematic theoretical analysis of the research in this article is carried out to analyze the relationship between the various characteristics of cognitive psychology and the design elements of the neural network, and it uses these relationships to guide the design practice. Second, it analyzes the relationship between the influence and interaction of cognitive psychology on neural network design and connects cognitive psychology with neural network design. Finally, according to the theoretical analysis and research of the system, the application of cognitive psychology in neural network design, design practice, and the relationship between the two are systematically reviewed. Through the exploratory research on cognitive psychology in neural network design, we can see that the combination of neural network design and psychology, art aesthetics, and other cross-disciplinary and multidisciplinary research is necessary, which can promote the scientific and technological progress of neural network design in the context of the information age and the improvement of public mental health. Under the background of the era in which the neural network design becomes the link between people's emotions and culture, we must fully understand the essential role of each element in neural network design and build a design concept based on cognitive psychology and emotional experience. It is hoped that the content of this topic can provide a certain reference value for the future development of neural network design and cognitive psychology and clarify the new development direction.
    Keywords Electronic computers. Computer science ; QA75.5-76.95
    Subject code 120
    Language English
    Publishing date 2021-01-01T00:00:00Z
    Publisher Hindawi-Wiley
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

To top