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  1. Article ; Online: Four alkaloids from

    Liu, Jing / Jiu, Junlong / Zhang, Xiaoqian / Sun, Jingkuan / Ying, Xixiang

    Natural product research

    2024  , Page(s) 1–7

    Abstract: Four alkaloids were isolated ... ...

    Abstract Four alkaloids were isolated from
    Language English
    Publishing date 2024-05-13
    Publishing country England
    Document type Journal Article
    ZDB-ID 2185747-7
    ISSN 1478-6427 ; 1478-6419
    ISSN (online) 1478-6427
    ISSN 1478-6419
    DOI 10.1080/14786419.2024.2352145
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Spatial simulations of soil content, storage, and quality indices in an archipelago off the Yangtze River Estuary, China

    Ji, Yuan / Sun, Jingkuan / Li, Tian / Ma, Xuejian

    Ecological Indicators. 2023 Feb., v. 146 p.109774-

    2023  

    Abstract: Comprehensively revealing the spatial pattern of soil condition is vital for exploring the evolution mechanism of island ecosystem and providing reference for ecological maintenance. However, it is difficult to meet the demands of comprehensiveness and ... ...

    Abstract Comprehensively revealing the spatial pattern of soil condition is vital for exploring the evolution mechanism of island ecosystem and providing reference for ecological maintenance. However, it is difficult to meet the demands of comprehensiveness and accuracy in mapping the soil condition in an archipelago that contains remote islands. Such an archipelago, namely, Shengsi Archipelago off the Yangtze River Estuary, China, was selected as the study area. Field survey was conducted on part of islands that have relatively high accessibility in the archipelago, and remote sensing data that cover the entire study area was adopted. An island soil index system, including soil content, storage, and quality indices, was proposed to represent the island soil integrated condition. Soil content indices are original soil measured data, and soil storage and quality indices are composite indices that are determined based on soil content indices. Then, a predictor system based on remote sensing and the 10-fold cross-validation were used to conduct the spatial simulations of soil indices. The results validated that the combination of soil measured data sourced by field survey could respond more sensitively to remote sensing data and integrate with it better than the original soil measured data, thereby increasing the simulation accuracies of soil storage and quality indices to higher levels than the corresponding soil content indices and achieving the spatial exhibition of soil integrated condition. The spatial pattern of soil indices in Shengsi Archipelago indicated that islands or areas with good vegetation condition but low soil salinity, land surface aridity, and human interference generally had good soil integrated condition. Then, suggestions to improve the island soil integrated condition were proposed from perspectives of different essential components of the island ecosystem. The study has provided a practical method for comprehensively mapping the soil condition in areas with low accessibility.
    Keywords anthropogenic activities ; dry environmental conditions ; ecosystems ; estuaries ; evolution ; soil quality ; soil salinity ; surveys ; vegetation ; China ; Yangtze River ; Soil integrated condition ; Island ; Spatial simulation ; Accessibility ; Heterogeneity ; Comprehensiveness
    Language English
    Dates of publication 2023-02
    Publishing place Elsevier Ltd
    Document type Article ; Online
    Note Use and reproduction
    ZDB-ID 2036774-0
    ISSN 1872-7034 ; 1470-160X
    ISSN (online) 1872-7034
    ISSN 1470-160X
    DOI 10.1016/j.ecolind.2022.109774
    Database NAL-Catalogue (AGRICOLA)

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  3. Article ; Online: Effects of global change and human disturbance on soil carbon cycling in boreal forest: A review

    SHAO, Pengshuai / HAN, Hongyan / SUN, Jingkuan / XIE, Hongtu

    Soil Science Society of China Pedosphere. 2023 Feb., v. 33, no. 1 p.194-211

    2023  

    Abstract: 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 management. Under global change and anthropogenic disturbances, soil ... ...

    Abstract 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 management. Under 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 sinks. Therefore, the forest C budget requires an understanding of the underlying soil C dynamic under environmental disturbances. The 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 forests. The effects of climate warming and N deposition on soil C cycling are complex, especially at short-term temporal scales. Climate 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-¹. Short-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 communities. Moderate 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 pool. Fire and logging lead to a large quantity of soil C loss via impaired plant productivity and increased organic matter degradation, exacerbating global warming. In particular, severe fire can cause a large amount of soil C loss, ca. 16-34 Mg C ha-¹ in the data we reviewed. Meanwhile, the black C input induced by fire and the plant residual C input from the roots of logged trees can increase the proportion of recalcitrant soil C and enhance the stability of soil C pool. We also highlight the positive feedback of forest restoration to soil C storage after fire and logging disturbances, indicating that effective forest restoration projects (e.g., afforestation and natural forest recovery) are necessary to sequester soil C belowground. Additionally, combined with microbial technologies and metagenomics- and metabolomics-based approaches, soil microorganisms are proved crucial for driving soil C cycling via C capture and the N recycling of plants and soil. We, therefore, suggest that clarifying the relationship among plant, SOM, and microorganisms is essential to better evaluate soil C cycling and to predict how boreal forests respond to global change and human disturbances. Further work is needed to assess long-term soil C feedback from high-latitude forests to broader regions.
    Keywords afforestation ; anthropogenic activities ; belowground biomass ; boreal forests ; carbon dioxide ; carbon sequestration ; carbon sinks ; climate ; ecosystems ; forest restoration ; global change ; humans ; latitude ; lignin ; nitrogen ; nutrient use efficiency ; plant growth ; soil carbon ; soil organic matter ; soil pH ; climate warming ; forest C budget ; forest management ; N deposition ; soil microorganism ; terrestrial ecosystem
    Language English
    Dates of publication 2023-02
    Size p. 194-211.
    Publishing place Elsevier Ltd
    Document type Article ; Online
    Note Pre-press version
    ZDB-ID 1090441-4
    ISSN 1002-0160
    ISSN 1002-0160
    DOI 10.1016/j.pedsph.2022.06.035
    Database NAL-Catalogue (AGRICOLA)

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  4. Article ; Online: Effects of short-term nitrogen and phosphorus addition on soil bacterial community of different halophytes.

    Zhang, Zehao / Wang, Lijie / Li, Tian / Fu, Zhanyong / Sun, Jingkuan / Hu, Rui / Zhang, Yao

    mSphere

    2024  , Page(s) e0022624

    Abstract: Soil microbial community composition and diversity are often affected by nutrient enrichment, which may influence soil microbes to affect nutrient cycling and plant community structure. However, the response of soil bacteria to nitrogen (N) and ... ...

    Abstract Soil microbial community composition and diversity are often affected by nutrient enrichment, which may influence soil microbes to affect nutrient cycling and plant community structure. However, the response of soil bacteria to nitrogen (N) and phosphorus (P) addition and whether it is influenced by plants remains unclear. By 16S rRNA sequencing, we investigated the response of the rhizosphere and bulk soil bacterial communities of different halophytes (salt-rejecting, salt-absorbing, and salt-secreting plant) in the Yellow River Delta to short-term N and P addition. The response of rhizosphere bacterial diversity to N and P addition was opposite in
    Importance: The bulk soil bacterial community was more affected by nutrient addition. Nitrogen (N) and phosphorus (P) have different effects on bacterial community. Soil organic matter is a key factor influencing the response of bacterial community to nutrient addition. N and P influence on bacterial community changes with plants.
    Language English
    Publishing date 2024-04-29
    Publishing country United States
    Document type Journal Article
    ISSN 2379-5042
    ISSN (online) 2379-5042
    DOI 10.1128/msphere.00226-24
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Reconstructions of four-dimensional spatiotemporal characteristics of soil organic carbon stock in coastal wetlands during the last decades

    Ji, Yuan / Sun, Jingkuan / Liu, Dahai / Xie, Zuolun

    Catena. 2022 Nov., v. 218 p.106553-

    2022  

    Abstract: In the context of multiple disturbances, soil organic carbon stock (SOCS) in coastal wetlands experiences drastic spatiotemporal variations, which involve four dimensions. However, the finiteness and discontinuity of historical field soil data hinder the ...

    Abstract In the context of multiple disturbances, soil organic carbon stock (SOCS) in coastal wetlands experiences drastic spatiotemporal variations, which involve four dimensions. However, the finiteness and discontinuity of historical field soil data hinder the four-dimensional SOCS reconstruction in coastal wetlands. In this study, the zonal and progressive simulations were integrated to reconstruct the four-dimensional characteristics of coastal wetland SOCS by using field soil data in current time point and remote sensing data during the last decades. The zonal simulation was adopted to conduct the two-dimensional simulation at a low cost of field survey. The spatial and temporal progressive simulations were implemented based on the close relationships among soil factors in different depths and at different time points, respectively, for realizing the three- and four-dimensional simulations. The demonstration of the study in Chongming Island, an important coastal wetland in China, validated the low cost, high accuracy, and good applicability of the approach. Over the entire island during the last decades, SOCS in surface layer showed overall increasing characteristics, while SOCS in intermediate and bottom layers did not exhibit distinct change trend. Generally, SOCS in surface layer increased and that in intermediate and bottom layers decreased along the gradient from the shoreline to the inner island. Continuous sediment discharge and deposition enlarged the areas of coastal wetlands and thus increased SOCS in the alongshore areas. Human activities distinctly increased SOCS through long-term and large-scale agricultural activities in the inner island, while decreased it through urbanization. Then, healthy, coordinated, and sustainable measures for increasing coastal wetland SOCS were proposed from perspectives of scale control, spatial configuration, and quality promotion. Therefore, this approach could reconstruct SOCS four-dimensional characteristics and achieve the conversions of soil data from point to area, from surface to bottom, and from present to past.
    Keywords carbon sinks ; catenas ; humans ; sediment yield ; shorelines ; soil ; soil organic carbon ; surveys ; urbanization ; wetlands ; China ; Coastal wetlands ; Four dimensions ; Reconstructions ; Spatial simulation ; Temporal simulation
    Language English
    Dates of publication 2022-11
    Publishing place Elsevier B.V.
    Document type Article ; Online
    ZDB-ID 519608-5
    ISSN 1872-6887 ; 0008-7769 ; 0341-8162
    ISSN (online) 1872-6887 ; 0008-7769
    ISSN 0341-8162
    DOI 10.1016/j.catena.2022.106553
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: Soil-landscape relationships in a coastal archipelagic ecosystem

    Chi, Yuan / Sun, Jingkuan / Xie, Zuolun / Wang, Jing

    Ocean & coastal management. 2022 Feb. 01, v. 216

    2022  

    Abstract: The soil–landscape analyses in the archipelago ecosystem contribute to providing reference for maintaining the island ecosystem and revealing the intrinsic correlations between soil and landscape in the context of landscape ecology. A China's coastal ... ...

    Abstract The soil–landscape analyses in the archipelago ecosystem contribute to providing reference for maintaining the island ecosystem and revealing the intrinsic correlations between soil and landscape in the context of landscape ecology. A China's coastal archipelagic ecosystem, Dongtou Archipelago, was selected as the study area. The spatial distributions of terrain (bottom layer), soil (interface layer), and landscape (upper layer) at island and grid scales were analyzed. The soil was measured using salinity, carbon, and fertility; and the landscape was represented by considering landscape composition, configuration, and quality. Then, the mutual relationships between soil and landscape at the multiple scales were explored. Results indicated that soil and landscape showed distinct spatial heterogeneities at island and grid scales. The sandy island showed worse soil and landscape conditions than the rocky islands; within the islands, soil and landscape conditions were generally good in the western part of the sandy island and the vegetation areas of the rocky islands. Moreover, the soil and landscape conditions were sensitive to the scale changes. Close correlations were observed among terrain, soil, and landscape in the archipelago. The soil and landscape conditions were good in positions or islands with high altitude and slope; the landscape condition was generally good in positions or islands with high total organic carbon and low salinity and fertility; and the soil condition was good in positions or islands with appropriate landscape composition and good landscape quality. The relationship between soil and landscape denoted that between nature and humans in the coastal archipelagic ecosystem. In the current phase, humans dominate the nature, and the landscape dominates the soil. Landscape composition and quality rather than configuration determined the spatial pattern of soil quality, and implications for the island ecosystem-based management were then derived on the basis of the soil–landscape relationship.
    Keywords altitude ; coastal zone management ; ecosystem management ; ecosystems ; landscape ecology ; landscapes ; salinity ; soil ; soil quality ; total organic carbon ; vegetation ; China
    Language English
    Dates of publication 2022-0201
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 0964-5691
    DOI 10.1016/j.ocecoaman.2021.105996
    Database NAL-Catalogue (AGRICOLA)

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  7. Article ; Online: The response of major air pollutants concentration to land use types in China

    LIU Jiawen / JIA Ruoyu / JIANG Yuying / XU Xinliang / WANG Yuan / SUN Jingkuan / QIAO Zhi

    Ziyuan Kexue, Vol 45, Iss 9, Pp 1869-

    2023  Volume 1883

    Abstract: Objective] Human activities change the nature of the underlying surface, which in turn has a significant impact on the spatiotemporal changes in air pollutant concentrations. Exploring the response relationship between air pollutant concentrations and ... ...

    Abstract [Objective] Human activities change the nature of the underlying surface, which in turn has a significant impact on the spatiotemporal changes in air pollutant concentrations. Exploring the response relationship between air pollutant concentrations and land use area is beneficial for understanding and controlling air pollution from the perspective of land resource management. [Methods] Based on the generalized additive model (GAM), this study investigated the nonlinear response relationship between the proportion of land use areas in 10 km × 10 km grids and the annual average concentrations of four main air pollutants (PM2.5, PM10, O3, and NO2) in 2020 in the six regions of China. The study used the air pollution effect contribution index (APECI) to identify contributions contrasting different land use types to the air pollutants in different pollutant concentration ranges. [Results] (1) In 2020, the highest regional annual average concentrations of PM2.5 and PM10 occurred in Northwest China and the lowest in Southwest China; NO2 and O3 had the highest regional annual average concentrations in East China, which were 25.23 μg/m3 and 102.60 μg/m3, respectively. (2) Air pollutant concentrations showed a nonlinear response relationship with the proportion of grid-based land use area. Generally, the increase in the proportion of the grid areas of farmland, construction land, and unused land led to an upward trend in the air pollutant concentration, while forest land and grassland often showed the opposite. (3) With regard to the differences in APECI, forest land and grassland showed a high APECI in the low air pollutant concentration ranges, while farmland and construction land showed a high APECI in the high air pollutant concentration ranges, but the APECI of water area and unused land varied in different regions. [Conclusion] This study proposed the possible overall effect of gridded land use area proportion on air pollution based on regional differences across China, providing a reference for regional joint ...
    Keywords |air pollutants|land use|generalized additive model (gam)|nonlinear response|air pollution effect contribution index (apeci) ; Environmental sciences ; GE1-350 ; Biology (General) ; QH301-705.5
    Subject code 333 ; 910
    Language Chinese
    Publishing date 2023-09-01T00:00:00Z
    Publisher Science Press, PR China
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Effects of short‐term nitrogen addition on rhizosphere and bulk soil bacterial community structure of three halophytes in the Yellow River Delta

    Zhang, Zehao / Li, Tian / Shao, Pengshuai / Sun, Jingkuan / Xu, Wenjing / Zhao, Yinghan

    Land Degradation & Development. 2023 July 15, v. 34, no. 11 p.3281-3294

    2023  

    Abstract: The total amount and rate of atmospheric nitrogen (N) deposition are constantly increasing, which substantially influences the soil microbial community structure and function. However, it is still unclear whether the responses of different plant ... ...

    Abstract The total amount and rate of atmospheric nitrogen (N) deposition are constantly increasing, which substantially influences the soil microbial community structure and function. However, it is still unclear whether the responses of different plant rhizosphere soil bacterial community to short‐term N addition was consistent. Based on 16s rRNA sequencing, we investigated the responses of rhizosphere and bulk soil bacterial community of halophytes (salt‐absorbing, salt‐rejecting, and salt‐secreting plant) to short‐term N addition in the Yellow River Delta. The bacterial community α‐diversity of Suaeda salsa (salt‐absorbing plant) was significantly higher in rhizosphere soil than in bulk soil, while no significant difference between Phragmites communis (salt‐rejecting plant) rhizosphere and bulk soil bacterial community α‐diversity was found. The differences were mainly ascribed to the higher N uptake capacity of P. communis, which resulted in no difference in N content between rhizosphere and bulk soil. The short‐term N addition significantly increased the α‐diversity of bacterial community in the rhizosphere soil of Aeluropus sinensis (salt‐secreting plant), but there was no effect on the α‐diversity of bacterial community in the rhizosphere soil of P. communis. Nitrogen addition enhances the salt uptake capacity of A. sinensis and alleviates the salt stress of bacterial growth. The relative abundance of Bacteroidetes for S. salsa and A. sinensis was significantly higher in rhizosphere soil than in bulk soil, and the relative abundance of Actinobacteria for P. communis and S. salsa was higher and lower in rhizosphere soil than in bulk soil, respectively. Salt‐absorbing of S. salsa leads to elevated rhizosphere soil salinity. Higher salinity and abundant carbon promote the Bacteroidetes and inhibit the Actinobacteria. Short‐term N addition caused an increase in the relative abundance of Gemmatimonadetes in halophyte rhizosphere soil and a decrease in the relative abundance of Firmicutes in S. salsa and A. sinensis bulk soil, which may be due to the different response of C:N of root secretions to N addition in halophytes. The relative abundance of rhizosphere soil denitrifying bacteria was higher in S. salsa and A. sinensis than in P. communis, while the reverse was observed for N‐fixing bacteria. The relative abundance of denitrifying bacteria decreased in P. communis and increased in S. salsa and A. sinensis. The low N soil environment of P. communis promotes the activity of N‐fixing bacteria, and the abundant N content of S. salsa and A. sinensis soil promotes the denitrification process. The research clarified that the response of soil bacterial community to short‐term N addition Treatment differed due to the influence of plant species and that N additions had smaller effects on the bacterial community than plant species.
    Keywords Actinobacteria ; Aeluropus ; Bacteroidetes ; Firmicutes ; Gemmatimonadetes ; Phragmites australis ; Suaeda salsa ; bacterial communities ; bacterial growth ; carbon ; community structure ; denitrification ; edaphic factors ; halophytes ; land degradation ; nitrogen ; nitrogen content ; rhizosphere ; river deltas ; salinity ; salt stress ; soil bacteria ; soil salinity ; Yellow River
    Language English
    Dates of publication 2023-0715
    Size p. 3281-3294.
    Publishing place John Wiley & Sons, Ltd.
    Document type Article ; Online
    Note JOURNAL ARTICLE
    ZDB-ID 1319202-4
    ISSN 1085-3278
    ISSN 1085-3278
    DOI 10.1002/ldr.4683
    Database NAL-Catalogue (AGRICOLA)

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  9. Article: Plants changed the response of bacterial community to the nitrogen and phosphorus addition ratio.

    Zhang, Zehao / Sun, Jingkuan / Li, Tian / Shao, Pengshuai / Ma, Jinzhao / Dong, Kaikai

    Frontiers in plant science

    2023  Volume 14, Page(s) 1168111

    Abstract: Introduction: Human activities have increased the nitrogen (N) and phosphorus (P) supply ratio of the natural ecosystem, which affects the growth of plants and the circulation of soil nutrients. However, the effect of the N and P supply ratio and the ... ...

    Abstract Introduction: Human activities have increased the nitrogen (N) and phosphorus (P) supply ratio of the natural ecosystem, which affects the growth of plants and the circulation of soil nutrients. However, the effect of the N and P supply ratio and the effect of plant on the soil microbial community are still unclear.
    Methods: In this study, 16s rRNA sequencing was used to characterize the response of bacterial communities in
    Results: The results showed that the a-diversity of the
    Discussion: Plants played a regulatory role in the process of N and P addition affecting the bacterial community, and nutrient uptake by the root system reduced the negative impact of N and P addition on the bacterial community. The variations in the rhizosphere soil bacterial community were mainly caused by the response of the plant to the N and P addition ratio.
    Language English
    Publishing date 2023-03-27
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2613694-6
    ISSN 1664-462X
    ISSN 1664-462X
    DOI 10.3389/fpls.2023.1168111
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Ecological stoichiometry, salt ions and homeostasis characteristics of different types of halophytes and soils.

    Zhao, Yinghan / Li, Tian / Liu, Junhan / Sun, Jingkuan / Zhang, Ping

    Frontiers in plant science

    2022  Volume 13, Page(s) 990246

    Abstract: Studying eco-stoichiometric and salt ions characteristics of halophytes and soils is helpful to understand the distribution mechanism of nutrients and salts in halophytes and their adaptation strategies to salinized habitats. In this study, three ... ...

    Abstract Studying eco-stoichiometric and salt ions characteristics of halophytes and soils is helpful to understand the distribution mechanism of nutrients and salts in halophytes and their adaptation strategies to salinized habitats. In this study, three different types of halophytes (
    Language English
    Publishing date 2022-10-13
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2613694-6
    ISSN 1664-462X
    ISSN 1664-462X
    DOI 10.3389/fpls.2022.990246
    Database MEDical Literature Analysis and Retrieval System OnLINE

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