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  1. Article ; Online: Extraradical hyphae alleviate nitrogen deposition-induced phosphorus deficiency in ectomycorrhiza-dominated forests.

    Zhang, Ziliang / Guo, Wanji / Wang, Jipeng / Lambers, Hans / Yin, Huajun

    The New phytologist

    2023  Volume 239, Issue 5, Page(s) 1651–1664

    Abstract: The continuous imbalance between nitrogen (N) and phosphorus (P) deposition is expected to shift many ecosystems from N- to P limitation. Extraradical hyphae of ectomycorrhizal (ECM) fungi play important roles in plant nutrient acquisition under nutrient ...

    Abstract The continuous imbalance between nitrogen (N) and phosphorus (P) deposition is expected to shift many ecosystems from N- to P limitation. Extraradical hyphae of ectomycorrhizal (ECM) fungi play important roles in plant nutrient acquisition under nutrient deficiency. However, whether and how ECM hyphae enhance soil P availability to alleviate N-induced P deficiency remains unclear. We investigated the impacts of ECM hyphae on transformations among different soil P fractions and underlying mechanisms under N deposition in two ECM-dominated forests. Ectomycorrhizal hyphae enhanced soil P availability under N addition by stimulating mineralization of organic P (Po) and desorption and solubilization of secondary mineral P, as indicated by N-induced increase in positive hyphal effect on plant-available P pool and negative hyphal effects on Po and secondary mineral P pools. Moreover, ECM hyphae increased soil phosphatase activity and abundance of microbial genes associated with Po mineralization and inorganic P solubilization, while decreasing concentrations of Fe/Al oxides. Our results suggest that ECM hyphae can alleviate N-induced P deficiency in ECM-dominated forests by regulating interactions between microbial and abiotic factors involved in soil P transformations. This advances our understanding of plant acclimation strategies via mediating plant-mycorrhiza interactions to sustain forest production and functional stability under changing environments.
    MeSH term(s) Phosphorus ; Ecosystem ; Hyphae ; Nitrogen ; Forests ; Mycorrhizae/physiology ; Minerals ; Plants ; Soil ; Soil Microbiology
    Chemical Substances Phosphorus (27YLU75U4W) ; Nitrogen (N762921K75) ; Minerals ; Soil
    Language English
    Publishing date 2023-06-15
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/nph.19078
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  2. Article ; Online: Extraradical hyphae exhibit more plastic nutrient‐acquisition strategies than roots under nitrogen enrichment in ectomycorrhiza‐dominated forests

    Zhu, Xiaomin / Lambers, H. / Guo, Wanji / Chen, Dongdong / Liu, Zhanfeng / Zhang, Ziliang / Yin, Huajun

    Global Change Biology. 2023 Aug., v. 29, no. 16 p.4605-4619

    2023  

    Abstract: Ectomycorrhizal (ECM) functional traits related to nutrient acquisition are impacted by nitrogen (N) deposition. However, less is known about whether these nutrient‐acquisition traits associated with roots and hyphae differentially respond to increased N ...

    Abstract Ectomycorrhizal (ECM) functional traits related to nutrient acquisition are impacted by nitrogen (N) deposition. However, less is known about whether these nutrient‐acquisition traits associated with roots and hyphae differentially respond to increased N deposition in ECM‐dominated forests with different initial N status. We conducted a chronic N addition experiment (25 kg N ha⁻¹ year⁻¹) in two ECM‐dominated forests with contrasting initial N status, that is, a Pinus armandii forest (with relatively low N availability) and a Picea asperata forest (with relatively high N availability), to assess nutrient‐mining and nutrient‐foraging strategies associated with roots and hyphae under N addition. We show that nutrient‐acquisition strategies of roots and hyphae differently respond to increased N addition. Root nutrient‐acquisition strategies showed a consistent response to N addition, regardless of initial forest nutrient status, shifting from organic N mining toward inorganic N foraging. In contrast, the hyphal nutrient‐acquisition strategy showed diverse responses to N addition depending on initial forest N status. In the Pinus armandii forest, trees increased belowground carbon (C) allocation to ECM fungi thus enhancing hyphal N‐mining capacity under increased N availability. By comparison, in the Picea asperata forest, ECM fungi enhanced both capacities of P foraging and P mining in response to N‐induced P limitation. In conclusion, our results demonstrate that ECM fungal hyphae exhibit greater plasticity in nutrient‐mining and nutrient‐foraging strategies than roots do in response to changes of nutrient status induced by N deposition. This study highlights the importance of ECM associations in tree acclimation and forest function stability under changing environments.
    Keywords Picea asperata ; Pinus armandii ; acclimation ; carbon ; ectomycorrhizae ; forests ; fungi ; global change ; hyphae ; nitrogen ; trees
    Language English
    Dates of publication 2023-08
    Size p. 4605-4619.
    Publishing place John Wiley & Sons, Ltd
    Document type Article ; Online
    Note JOURNAL ARTICLE
    ZDB-ID 1281439-8
    ISSN 1365-2486 ; 1354-1013
    ISSN (online) 1365-2486
    ISSN 1354-1013
    DOI 10.1111/gcb.16768
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  3. Article ; Online: Extraradical hyphae alleviate nitrogen deposition‐induced phosphorus deficiency in ectomycorrhiza‐dominated forests

    Zhang, Ziliang / Guo, Wanji / Wang, Jipeng / Lambers, H. / Yin, Huajun

    New Phytologist. 2023 Sept., v. 239, no. 5 p.1651-1664

    2023  

    Abstract: The continuous imbalance between nitrogen (N) and phosphorus (P) deposition is expected to shift many ecosystems from N‐ to P limitation. Extraradical hyphae of ectomycorrhizal (ECM) fungi play important roles in plant nutrient acquisition under nutrient ...

    Abstract The continuous imbalance between nitrogen (N) and phosphorus (P) deposition is expected to shift many ecosystems from N‐ to P limitation. Extraradical hyphae of ectomycorrhizal (ECM) fungi play important roles in plant nutrient acquisition under nutrient deficiency. However, whether and how ECM hyphae enhance soil P availability to alleviate N‐induced P deficiency remains unclear. We investigated the impacts of ECM hyphae on transformations among different soil P fractions and underlying mechanisms under N deposition in two ECM‐dominated forests. Ectomycorrhizal hyphae enhanced soil P availability under N addition by stimulating mineralization of organic P (Po) and desorption and solubilization of secondary mineral P, as indicated by N‐induced increase in positive hyphal effect on plant‐available P pool and negative hyphal effects on Po and secondary mineral P pools. Moreover, ECM hyphae increased soil phosphatase activity and abundance of microbial genes associated with Po mineralization and inorganic P solubilization, while decreasing concentrations of Fe/Al oxides. Our results suggest that ECM hyphae can alleviate N‐induced P deficiency in ECM‐dominated forests by regulating interactions between microbial and abiotic factors involved in soil P transformations. This advances our understanding of plant acclimation strategies via mediating plant–mycorrhiza interactions to sustain forest production and functional stability under changing environments.
    Keywords acclimation ; desorption ; ectomycorrhizae ; hyphae ; mineralization ; nitrogen ; nutrient deficiencies ; phosphorus ; soil ; solubilization ; timber production
    Language English
    Dates of publication 2023-09
    Size p. 1651-1664.
    Publishing place John Wiley & Sons, Ltd
    Document type Article ; Online
    Note JOURNAL ARTICLE
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/nph.19078
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  4. Article ; Online: Analysis of clinical characteristics and prognostic factors of elderly patients with renal cell carcinoma based on the SEER database.

    Peng, Xiaoyan / Sun, Hui / Wang, Lingxiao / Guo, Wanji / Zhao, Zhenxiang / Yang, Jian

    Medicine

    2023  Volume 102, Issue 25, Page(s) e34069

    Abstract: To study the difference of clinical characteristics and prognostic factors from elderly patients with renal cell carcinoma (RCC), the statistical analysis was carried out based on the surveillance, epidemiology, and end results database. The relevant ... ...

    Abstract To study the difference of clinical characteristics and prognostic factors from elderly patients with renal cell carcinoma (RCC), the statistical analysis was carried out based on the surveillance, epidemiology, and end results database. The relevant clinical information of 19,472 RCC patients from 2010 to 2015 were collected, and the differences of clinicopathological characteristics and survival rate was analyzed by log-rank method and Chi square test, respectively. Multivariate Cox regression model was used to explore the independent risk factors affecting the long-term survival of RCC patients. Results showed that the proportion of elderly RCC patients in the 60-64-year group in 2010 was 15.20%, but the value elevated to 18.51% in 2015, and the Chi-square test revealed the significant correlation between elderly RCC patients with gender, race, American Joint Committee on cancer stage, T stage, N stage, and M stage. The difference of survival time between the 60-69 year, 70-79 year, 80-84 year, and 85+ year group was significant, and Kaplan-Meier analysis showed a negative effects of age on survival rate of RCC patients, indicating a worsening trend with increasing age. Cox proportional hazards model analysis further confirmed that age was the important independent prognostic factor. Our study reveals that the onset age of RCC in elderly population is gradually decreasing, and the malignant degree of elderly RCC patients is increasing with age. The female elderly population could be more susceptible to RCC than male elderly population, and 85+ year population could also be cancer susceptible with a higher lymph node metastasis rate, later tumor stage, and poor prognosis, suggesting that these elderly populations should pay more attention to the RCC screening.
    MeSH term(s) Humans ; Male ; Female ; Aged ; Carcinoma, Renal Cell/pathology ; Kidney Neoplasms/pathology ; Prognosis ; Neoplasm Staging ; Proportional Hazards Models
    Language English
    Publishing date 2023-06-14
    Publishing country United States
    Document type Journal Article
    ZDB-ID 80184-7
    ISSN 1536-5964 ; 0025-7974
    ISSN (online) 1536-5964
    ISSN 0025-7974
    DOI 10.1097/MD.0000000000034069
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  5. Article ; Online: Extraradical hyphae exhibit more plastic nutrient-acquisition strategies than roots under nitrogen enrichment in ectomycorrhiza-dominated forests.

    Zhu, Xiaomin / Lambers, Hans / Guo, Wanji / Chen, Dongdong / Liu, Zhanfeng / Zhang, Ziliang / Yin, Huajun

    Global change biology

    2023  Volume 29, Issue 16, Page(s) 4605–4619

    Abstract: Ectomycorrhizal (ECM) functional traits related to nutrient acquisition are impacted by nitrogen (N) deposition. However, less is known about whether these nutrient-acquisition traits associated with roots and hyphae differentially respond to increased N ...

    Abstract Ectomycorrhizal (ECM) functional traits related to nutrient acquisition are impacted by nitrogen (N) deposition. However, less is known about whether these nutrient-acquisition traits associated with roots and hyphae differentially respond to increased N deposition in ECM-dominated forests with different initial N status. We conducted a chronic N addition experiment (25 kg N ha
    MeSH term(s) Plant Roots/microbiology ; Hyphae ; Nitrogen ; Plastics ; Soil ; Forests ; Mycorrhizae/physiology ; Trees/physiology ; Picea ; Pinus ; Soil Microbiology
    Chemical Substances Nitrogen (N762921K75) ; Plastics ; Soil
    Language English
    Publishing date 2023-06-09
    Publishing country England
    Document type Journal Article
    ZDB-ID 1281439-8
    ISSN 1365-2486 ; 1354-1013
    ISSN (online) 1365-2486
    ISSN 1354-1013
    DOI 10.1111/gcb.16768
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  6. Article: Seasonal variations in plant nitrogen acquisition in an ectomycorrhizal alpine forest on the eastern Tibetan Plateau, China

    Guo, Wanji / Zhang, Ziliang / Liu, Qing / Xiao, Juan / Yin, Huajun

    Plant and soil. 2021 Feb., v. 459, no. 1-2

    2021  

    Abstract: BACKGROUND AND AIMS: Plant nitrogen (N) acquisition plays an important role in regulating plant growth and ecosystem functions. However, the seasonal variations in the relative contributions of different N sources to plant N uptake and how plants modify ... ...

    Abstract BACKGROUND AND AIMS: Plant nitrogen (N) acquisition plays an important role in regulating plant growth and ecosystem functions. However, the seasonal variations in the relative contributions of different N sources to plant N uptake and how plants modify their N absorption preferences, especially in ectomycorrhizal forests, are not well understood. METHODS: We used the in situ ¹⁵N-labeling method to quantitatively estimate the relative uptake contributions of plants for three different soil N sources (nitrate, ammonium and amino acids) and plant N acquisition preferences in an ectomycorrhizal alpine forest (a 70-year-old spruce plantation on the eastern Tibetan Plateau, China) during the growing season and the nongrowing season. RESULTS: Across the two seasons, plants in the spruce plantation showed a greater preference for acquiring soil NH₄⁺-N, with soil NH₄⁺ contributing more than 50% to the total N uptake of plants (57.88% during the growing season and 52.72% during the non-growing season). Moreover, amino acids exhibited a considerable contribution to the total plant N uptake, and their contribution was significantly higher during the non-growing season (33.47%) than that during the growing season (9.86%). Accordingly, plants showed a greater preference for taking up amino acids over NO₃⁻ -N in the soil as the season changed from the growing season to the non-growing season. CONCLUSIONS: Collectively, our data demonstrate that soil inorganic N is the predominant N source for plants in alpine forests, irrespective of seasonal variations. However, soil amino acids could also be an important supplementary N source for the plant N economy, especially during the non-growing season, when inorganic N availability is constrained. Our findings also suggest that plants in ectomycorrhizal alpine forests modify their nutrient absorption preference in response to seasonal changes.
    Keywords absorption ; ammonium ; ecosystems ; ectomycorrhizae ; nitrates ; nutrient uptake ; plant growth ; plant nitrogen content ; soil ; total nitrogen ; China
    Language English
    Dates of publication 2021-02
    Size p. 79-91.
    Publishing place Springer International Publishing
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 208908-7
    ISSN 1573-5036 ; 0032-079X
    ISSN (online) 1573-5036
    ISSN 0032-079X
    DOI 10.1007/s11104-020-04644-8
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  7. Article ; Online: Precipitation, rather than temperature drives coordination of multidimensional root traits with ectomycorrhizal fungi in alpine coniferous forests

    Ding, Junxiang / Yin, Huajun / Kong, Deliang / Liu, Qing / Zhang, Ziliang / Wang, Qitong / Guo, Wanji / Valverde‐Barrantes, Oscar J. / Wang, Junjian / Liu, Zhanfeng

    Journal of Ecology. 2023 Sept., v. 111, no. 9 p.1935-1949

    2023  

    Abstract: The interactions between roots and mycorrhizal fungi are critical for our understanding of the multidimensional root economics space. Our knowledge on their relationships comes mainly from arbuscular mycorrhizal (AM) plants, and less is known about how ... ...

    Abstract The interactions between roots and mycorrhizal fungi are critical for our understanding of the multidimensional root economics space. Our knowledge on their relationships comes mainly from arbuscular mycorrhizal (AM) plants, and less is known about how roots are coordinated with ectomycorrhizal (ECM) fungal communities, especially in ECM‐dominated alpine forests that are highly sensitive to climate change worldwide. Here, we investigated the coordination between roots and ECM fungi and their drivers by measuring multiple root traits, ECM fungal composition and environmental factors of 47 coniferous populations across the alpine coniferous forests on the Tibetan Plateau. Our results reveal two independent fine‐root trait dimensions, that is root foraging dimension and root uptake dimension, which are represented by root diameter‐specific root length, root tissue density‐root N concentration. Importantly, the hyphal exploration type based ECM foraging correlated significantly with both root foraging and root uptake dimension. Further, in the low temperature plateau, it is precipitation‐induced changes in soil moisture, soil nutrients and pH that drive the proportion of longer‐distance hyphal exploration types to increase with higher root foraging by higher specific root length, and to decrease with higher uptake by higher root N concentration. Synthesis. The coordination of multidimensional root traits with ECM fungi differs greatly from the well‐recognized pattern in AM plants that mycorrhizal fungi connect predominantly with root foraging and that roots and mycorrhizal fungi are temperature sensitive. These findings provide a new insight for our holistic understanding of how roots and mycorrhizal fungi vary collaboratively and hence driving plant community assembly and responses to the changing climate.
    Keywords climate ; climate change ; economics ; ectomycorrhizae ; fine roots ; fungi ; hyphae ; nitrogen content ; pH ; plant communities ; soil water ; temperature ; vesicular arbuscular mycorrhizae ; China
    Language English
    Dates of publication 2023-09
    Size p. 1935-1949.
    Publishing place John Wiley & Sons, Ltd
    Document type Article ; Online
    Note JOURNAL ARTICLE
    ZDB-ID 3023-5
    ISSN 0022-0477
    ISSN 0022-0477
    DOI 10.1111/1365-2745.14151
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  8. Article: Absorptive and transport roots differ in terms of their impacts on rhizosphere soil carbon storage and stability in alpine forests

    Wang, Qitong / Zhang, Ziliang / Guo, Wanji / Zhu, Xiaomin / Xiao, Juan / Liu, Qing / Yin, Huajun

    Soil biology & biochemistry. 2021 Oct., v. 161

    2021  

    Abstract: The fine roots of woody plants can be classified as absorptive roots and transport roots based on their distinct morphological, physiological, and functional traits. The potential ecological consequences of roots with different functional classifications ...

    Abstract The fine roots of woody plants can be classified as absorptive roots and transport roots based on their distinct morphological, physiological, and functional traits. The potential ecological consequences of roots with different functional classifications on soil biogeochemical processes have been widely recognized. However, the magnitude of rhizosphere soil C stocks and the associated C stabilization mechanisms driven by these two root functional modules remain unknown. We quantified the soil organic C (SOC) contents and the C fractions in the rhizospheres of absorptive and transport roots in mineral soil in a spruce (Picea asperata Mast.) plantation and further estimated the rhizosphere SOC stocks of the two root functional modules by establishing a numerical model based on the extent of the rhizosphere. We also determined the characteristics of the SOC chemistry and metal-organic complexation in the rhizosphere to distinguish how the two root functional modules differentially impact rhizosphere SOC stability. The SOC content of the rhizosphere of absorptive roots was 15.7% higher than that of the rhizosphere of transport roots. This result can be mainly attributed to the higher stability of SOC (i.e., chemical recalcitrance and metal-organic bond) in the rhizosphere of absorptive roots. The numerical model analysis showed that the rhizosphere SOC pool of absorptive roots (0.27–2.7 kg C/m²) was twice as large as that of transport roots (0.18–1.36 kg C/m²). The contribution of the rhizosphere SOC stock of absorptive roots (63.5%) to the total rhizosphere SOC accrual was much higher than that of the rhizosphere SOC stock of transport roots (36.5%) in the scenario with a 1-mm extent. The rhizosphere soil C stock of absorptive roots plays a predominant role in the total rhizosphere soil C stock in alpine coniferous forests. Our findings highlight the importance of integrating function-based fine root classifications with rhizosphere soil C storage into land surface models of C cycling, which would be instrumental for accurately predicting soil C dynamics in alpine coniferous forest ecosystems.
    Keywords Picea asperata ; biochemistry ; carbon sequestration ; carbon sinks ; coniferous forests ; fine roots ; mathematical models ; mineral soils ; rhizosphere ; soil organic carbon
    Language English
    Dates of publication 2021-10
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 280810-9
    ISSN 0038-0717
    ISSN 0038-0717
    DOI 10.1016/j.soilbio.2021.108379
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  9. Article: Soil fertility controls ectomycorrhizal mycelial traits in alpine forests receiving nitrogen deposition

    Guo, Wanji / Ding, Junxiang / Wang, Qitong / Yin, Mingzhen / Zhu, Xiaomin / Liu, Qing / Zhang, Ziliang / Yin, Huajun

    Soil biology & biochemistry. 2021 Oct., v. 161

    2021  

    Abstract: Anthropogenic nitrogen (N) deposition is known to profoundly alter the dynamics of mycelial traits of ectomycorrhizal (ECM) fungi in forest ecosystems. The site-specific change in mycelial traits in forests receiving N deposition led us to hypothesize ... ...

    Abstract Anthropogenic nitrogen (N) deposition is known to profoundly alter the dynamics of mycelial traits of ectomycorrhizal (ECM) fungi in forest ecosystems. The site-specific change in mycelial traits in forests receiving N deposition led us to hypothesize that growth and functional traits of ECM mycelia are controlled by soil nutrient availability in these forests. In this study, we conducted a N fertilization experiment in two alpine forests (Picea asperata Mast. and Pinus armandii Franch.) on the eastern Tibetan Plateau, China, to assess the responses of mycelial growth traits (biomass, production, density and turnover) and functional traits (exploration type and hydrophobicity) to N addition. We quantified the turnover and production of mycelia by determining mycelial biomass in sequentially harvested in-growth mesh bags and by applying mathematical models. We also captured the changes in mycelium exploration type and hydrophobicity by characterizing the ECM fungal community composition. Nitrogen addition promoted mycelial growth, with 79% more mycelial production, 39% greater biomass, and 73% higher density in the P. armandii stand with lower soil N availability (18 mg mineral N kg⁻¹), but N addition repressed the mycelial growth in the P. asperata stand with higher soil N availability (30 mg mineral N kg⁻¹). Additionally, N deposition increased the abundance of genera belonging to ‘Contact-Short’ and ‘Contact-Medium’ explorers and reduced that of ‘Medium-Long’ explorers in the P. armandii stand. N deposition had opposite effect on mycelial functional traits in the P. asperata stand. Collectively, this confirms that the responses of mycelial dynamics to N deposition in forests largely depend on native soil nutrient availability.
    Keywords Picea asperata ; Pinus armandii ; biomass ; community structure ; ectomycorrhizae ; fungal communities ; hydrophobicity ; mycelium ; nitrogen ; nutrient availability ; soil ; soil biology ; soil fertility ; soil nutrients ; China
    Language English
    Dates of publication 2021-10
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 280810-9
    ISSN 0038-0717
    ISSN 0038-0717
    DOI 10.1016/j.soilbio.2021.108386
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  10. Article: 根系分泌物收集技术研究进展.

    Guo, Wan-Ji / Zhang, Zi-Liang / Liu, Qing / Yin, Hua-Jun

    Ying yong sheng tai xue bao = The journal of applied ecology

    2019  Volume 30, Issue 11, Page(s) 3951–3962

    Abstract: Root exudates play an important role in mediating the exchange of substrates, energy and information within the rhizosphere in terrestrial ecosystems. Constructing accurate and applicable sampling system of root exudates to precisely collect the ... ...

    Title translation Research progress of root exudates collection technology.
    Abstract Root exudates play an important role in mediating the exchange of substrates, energy and information within the rhizosphere in terrestrial ecosystems. Constructing accurate and applicable sampling system of root exudates to precisely collect the characters including the component and concentration of root exudates and their responses to changing environments are a critical link and prerequisite to understand ecological processes and information exchanges across the root-soil interface. While both traditional and novel techniques for collecting root exudates aim to explore the diversity and concentration of root exudates, current exudate-collection methods could hardly avoid the damage of root system, the adsorption and release of root exudates by soil particles, and distur-bance from microbial metabolism, largely because plant roots are highly associated with the surrounding substrates and environments supporting their growth. Therefore, all root exudate collection methods have their own merits and shortcomings. We systematically reviewed the widely-used traditional and novel root exudates collection techniques and compared their advantages and disadvantages. Furthermore, considering the significance and authenticity of field study on the rhizosphere ecological processes in forest ecosystems, we proposed three frontier research directions regarding the construction of techniques for collecting root exudates in forest ecosystems according to the limits of current studies, aiming to provide foundation for related studies in the future.
    MeSH term(s) Ecosystem ; Plant Exudates ; Plant Roots ; Rhizosphere ; Soil ; Soil Microbiology
    Chemical Substances Plant Exudates ; Soil
    Language Chinese
    Publishing date 2019-12-05
    Publishing country China
    Document type Journal Article ; Systematic Review
    ZDB-ID 2881809-X
    ISSN 1001-9332
    ISSN 1001-9332
    DOI 10.13287/j.1001-9332.201911.040
    Database MEDical Literature Analysis and Retrieval System OnLINE

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