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  1. Article ; Online: Leaf nutrient resorption of two life-form tree species in urban gardens and their response to soil nutrient availability.

    Hu, Ruyuan / Liu, Tairui / Zhang, Yunxiang / Zheng, Rongrong / Guo, Jinping

    PeerJ

    2023  Volume 11, Page(s) e15738

    Abstract: Background: Leaf nutrient resorption is a key strategy in plant conservation that minimizes nutrient loss and enhances productivity. However, the differences of the nutrient resorption among garden tree species in urban ecosystems were not clearly ... ...

    Abstract Background: Leaf nutrient resorption is a key strategy in plant conservation that minimizes nutrient loss and enhances productivity. However, the differences of the nutrient resorption among garden tree species in urban ecosystems were not clearly understood, especially the differences of nitrogen resorption efficiency (NRE) and phosphorous resorption efficiency (PRE) between evergreen and deciduous trees.
    Methods: We selected 40 most generally used garden tree specie belonged two life forms (evergreen and deciduous) and investigated the nitrogen (N) and phosphorus (P) concentrations in green and senesced leaves and soil nutrient concentrations of nine samples trees for each species. Then, the nutrient concentrations and resorption efficiency were compared, and the soil nutrients utilization strategies were further analyzed.
    Results: The results showed that the N concentration was significantly higher in the green and senesced leaves of deciduous trees than in the leaves of evergreen trees. The two life-form trees were both N limited and evergreen trees were more sensitive to N limitation. The NRE and PRE in the deciduous trees were significantly higher than those in the evergreen trees. The NRE was significantly positively correlated with the PRE in the deciduous trees. As the soil N and P concentrations increased, the nutrient resorption efficiency (NuRE) of the evergreen trees increased, but that of the deciduous trees decreased. Compared with the deciduous trees, the evergreen trees were more sensitive to the feedback of soil N and P concentrations. These findings reveal the N and P nutrient resorption mechanism of evergreen and deciduous trees and fill a gap in the understanding of nutrient resorption in urban ecosystems.
    MeSH term(s) Trees/physiology ; Ecosystem ; Gardens ; Soil ; Phosphorus ; Plant Leaves/physiology ; Nitrogen ; Nutrients
    Chemical Substances Soil ; Phosphorus (27YLU75U4W) ; Nitrogen (N762921K75)
    Language English
    Publishing date 2023-07-19
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2703241-3
    ISSN 2167-8359 ; 2167-8359
    ISSN (online) 2167-8359
    ISSN 2167-8359
    DOI 10.7717/peerj.15738
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Effects of stand density on soil respiration and labile organic carbon in different aged Larix principis-rupprechtii plantations

    Liu, Tairui / Peng, Daoli / Tan, Zhijie / Guo, Jinping / Zhang, Yunxiang

    Ecological processes. 2021 Dec., v. 10, no. 1

    2021  

    Abstract: BACKGROUND: The carbon pools of forest soils play a vital role in global carbon sequestration and emissions. Forest management can regulate the sequestration and output of forest soil carbon pools to a certain extent; however, the kinetics of the effects ...

    Abstract BACKGROUND: The carbon pools of forest soils play a vital role in global carbon sequestration and emissions. Forest management can regulate the sequestration and output of forest soil carbon pools to a certain extent; however, the kinetics of the effects of forest density on soil carbon pools require further investigation. METHODS: We established sample plots with stand density gradients in three different aged Larix principis-rupprechtii plantations and quantified the soil respiration, soil organic carbon (SOC), soil dissolved organic carbon (DOC), microbial biomass carbon (MBC), light fraction organic carbon (LFOC), and readily oxidized carbon (ROC). RESULTS AND CONCLUSIONS: During the growth and development of plantations, stand density is an essential factor that impacts soil respiration and its associated elements. Moderate density was observed to promote both the soil and heterotrophic respiration rates and the sequestration of MBC and LFOC, whereas it inhibited the sequestration of ROC. The soil, heterotrophic, and autotrophic respiration rates of older forest stands were relatively rapid, whereas the contents of SOC, MBC, LFOC, DOC, and ROC were higher and more sensitive to changes in stand density. The MBC, LFOC, and ROC in soil labile organic carbon were closely related to both the soil and heterotrophic respiration, but not the SOC. Among them, the LFOC and MBC played the roles of “warehouse” and “tool” and were significantly correlated with soil and heterotrophic respiration. The ROC, as a “raw material”, exhibited a significantly negative correlation with the soil and heterotrophic respiration. When the soil and heterotrophic respiration rates were rapid, the ROC content in the soil maintained the low level of a “dynamically stabilized” state. The stand density regulated heterotrophic respiration by affecting the soil labile organic carbon, which provided an essential path for the stand density to regulate soil respiration.
    Keywords Larix gmelinii var. principis-rupprechtii ; carbon sequestration ; forest management ; forest soils ; forests ; growth and development ; labile carbon ; microbial carbon ; oxidation ; soil respiration ; stand density
    Language English
    Dates of publication 2021-12
    Size p. 44.
    Publishing place Springer Berlin Heidelberg
    Document type Article
    ZDB-ID 2694945-3
    ISSN 2192-1709
    ISSN 2192-1709
    DOI 10.1186/s13717-021-00301-9
    Database NAL-Catalogue (AGRICOLA)

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