The effects of mycorrhizal roots on litter decomposition, soil biota, and nutrients in a spodosolic soil

Zhu, Weixing; Ehrenfeld, Joan G.

doi:10.1007/bf00011648

Cited by 53 publications

(31 citation statements)

References 50 publications

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“…It has been found that in forest soils, roots and ectomycorrhizal fungi significantly retard decomposition rates of litter decomposition through the "Gadgil effect" (33,34). In contrast, roots stimulate greater activity of the soil biota in soils with low total C and N contents and, in turn, contribute to faster litter decomposition and nutrient release (69). In the present study, although roots of A. holosericea (inoculated or not with P. albus IR100) decreased microbial biomass, soil N and P levels were enhanced in the P. albus treatment.…”

Section: Discussioncontrasting

confidence: 55%

The Exotic Legume Tree Species Acacia holosericea Alters Microbial Soil Functionalities and the Structure of the Arbuscular Mycorrhizal Community

Remigi

Faye

Kane

et al. 2008

Appl Environ Microbiol

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The response of microbial functional diversity as well as its resistance to stress or disturbances caused by the introduction of an exotic tree species, Acacia holosericea, ectomycorrhized or not with Pisolithus albus, was examined. The results show that this ectomycorrhizal fungus promotes drastically the growth of this fastgrowing tree species in field conditions after 7 years of plantation. Compared to the crop soil surrounding the A. holosericea plantation, this exotic tree species, associated or not with the ectomycorrhizal symbiont, induced strong modifications in soil microbial functionalities (assessed by measuring the patterns of in situ catabolic potential of microbial communities) and reduced soil resistance in response to increasing stress or disturbance (salinity, temperature, and freeze-thaw and wet-dry cycles). In addition, A. holosericea strongly modified the structure of arbuscular mycorrhizal fungus communities. These results show clearly that exotic plants may be responsible for important changes in soil microbiota affecting the structure and functions of microbial communities.Forest loss and degradation through human disturbance as well as deterioration of land productivity is a major problem in large areas of arid and semiarid environments. Degraded soils are characterized by loss or disturbance of the vegetation cover, increased soil erosion, decreased in-water infiltration, loss of available nutrients and organic matter, loss of microbial propagules, and/or diminution in microbial activity (25,35,44). Restoration of ecosystem health and productivity was traditionally achieved via abandonment of land and subsequent natural forest succession. In recent decades, management options for acceleration of the recovery and restoration of the productivity and biodiversity of disturbed ecosystems have been considered, since fallow periods have been shortened or eliminated due to increased anthropogenic pressure and agriculture intensification (49). Concerning the techniques used for rehabilitating degraded areas, there is increasing evidence that forest plantations can play a key role in ecosystem rehabilitation or restoration (52). Among candidate plantation species, fast-growing leguminous tree species (e.g., Australian Acacia species) should have preference.

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Section: Discussioncontrasting

confidence: 55%

The Exotic Legume Tree Species Acacia holosericea Alters Microbial Soil Functionalities and the Structure of the Arbuscular Mycorrhizal Community

Remigi

Faye

Kane

et al. 2008

Appl Environ Microbiol

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“…Destruction of the moss cover after clear-cutting (III) may have further increased the moisture and temperature fluctuations in the soil surface and the organic layer because the moss layer has an insulating effect. Moreover, the loss of root exudation may have decreased microbial activity in the clear-cut area (Zhu and Ehrenfeld 1996). The decomposition of roots, branches and foliage has not earlier been compared between clear-cut and forest areas in Finland.…”

Section: Decomposition In the Clear-cut Area Compared To The Uncut Fomentioning

confidence: 99%

Logging residues and ground vegetation in nutrient dynamics of a clear-cut boreal forest

Palviainen¹

2005

Diss. For.

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In this thesis are studied the role of decomposing logging residues and developing ground vegetation in nutrient dynamics of a clear-cut area. The main aims were to study how much nutrients are released from logging residues during the first three years after clear-cutting and what is the role of ground vegetation in the retention of nutrients on site after clear-cutting. The study was conducted in eastern Finland in a Norway spruce dominated mixed forest, part of which was clear-cut and part left uncut. The decomposition of Norway spruce (Picea abies (L.) H. Karst.), Scots pine (Pinus sylvestris L.) and silver birch (Betula pendula Roth) logging residues i.e. foliage, fine roots (diameter 2 mm) and branches (diameter 1 cm), were studied using the litterbag method. Above-and below-ground biomass of the ground vegetation was sampled on one uncut plot and two clear-cut plots one year before and five years after clear-cutting.In total, 33 % of the dry mass and C, 49 % of P, 90 % of K and 8 % of Ca were released from logging residues in three years, but there was no net release of N because more N accumulated in the roots and branches than was released from the foliage. The loss of mass, C, P and K was greatest during the first year, whereas there was no net release of Ca until the third year. Most of the released nutrients originated from the foliage. Total ground vegetation biomass and nutrient pools decreased after clear-cutting to one half or even lower, but returned to precutting levels within 4-5 years, and the pools of P and K became even larger. In the first year after clear-cutting more N and Ca accumulated in the logging residues than were stored in the ground vegetation.The results indicate that logging residues are a potential source of the elevated dissolved C and P, K and Ca observed in surface waters soon after clear-cutting, but are not a net source of N during the first three years. The ground vegetation is capable of taking up only a small fraction of the nutrients that are released from logging residues during the first two years after clear-cutting and the decomposing dead ground vegetation is a potential source of leached nutrients. The results suggest that nutrients released from logging residues are initially retained on site primarily through soil processes and microbial immobilization. Solely microbial immobilization in logging residues can initially play a more important role in the retention of N and Ca than the ground vegetation. Ground vegetation, however, recovers rapidly from clear-cutting and it becomes thereafter a significant nutrient sink.

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“…林矿质土层C含量比EM高8.0% (Lin et al, 2016), Hagen-Thorn et al, 2004;Mueller et al, 2012Mueller et al, , 2015。Vesterdal等 (2012) (Hodge et al, 2010;Asghari & Cavagnaro, 2011;Veresoglou et al, 2012;Hodge & Storer, 2015) Hawkins et al, 2000;Whiteside et al, 2012;李元敬等, 2013;Hodge & Storer, 2015 (Vesterdal et al, 2013;Lin et al, 2016), (Cotrufo et al, 2013) Hobbie et al, 2007;Mueller et al, 2012), 也有研究表明二者之间差异不显著 (Taylor et al, 2016) 落物分解过程也十分重要 (Zhu & Ehrenfeld, 1996;Brzostek et al, 2015;Fernandez & Kennedy, 2016), 调节着森林土壤C、 N的输出过程 (Moore et al, 2015;Soudzilovskaia et al, 2015;Paterson et al, 2016 (Zhu & Ehrenfeld, 1996;Cheng et al, 2012;Nottingham et al, 2013)。采用挖壕、树干环割等试验方法的很多研究在EM森林发现根际激发效应 (Zhu & Ehrenfeld, 1996;Subke et al, 2010;Brzostek et al, 2015), (Drake et al, 2011;Phillips et al, 2011Phillips et al, , 2012Talhelm et al, 2014), 从而减少了土壤有机质含量。不同菌根类型森林土壤C、N循环对CO 2 浓度升高响应会影响植物养分限制程度, 最终造成森林生产力对气候变化的响应不同 (Phillips et al, 2011;Terrer et al, 2016Terrer et al, , 2017 (Zerihun & Bassirirad, 2001), 但其土壤有机质却以物理或化学形式被保护起来, 使微生物难以接触利用 (Iversen et al, 2012;…”

Section: )。不同菌根树种可通过地上(凋落物)及地下(根系及菌根真菌)特性直接或间接地影响森林土壤C、unclassified

森林土壤碳氮循环过程的新视角: 丛枝与外生菌根树种的作用

Wang¹,

Wang²,

Zhang³

2017

Chin. J. Plant Ecol.

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Nearly all tree species develop symbiotic relationships with either arbuscular mycorrhizal (AM) or ectomycorrhizal (EM) fungi to acquire nutrients from soils, and hence influence soil carbon (C) and nitrogen (N) cycles in terrestrial ecosystems. It is crucial to understand the differences in soil C and N cycles between AM and EM forests and the underlying mechanisms. In this review, we first compared the differences in the soil C and N cycles between AM and EM forests, and synthesized the underlying mechanisms from perspectives of the inputs, stabilization, and outputs of soil C and N in forest ecosystems. We also compared the responses of soil C and N cycles between AM and EM forests to global changes. In this field, one major research priority is comparing the structure and function (including the soil C and N cycles) between AM and EM forest ecosystems to provide theoretical basis and solid data for improving forest productivity and ecosystem services. The second research focus is deepening the understanding of the effects of interactions between aboveground litter and belowground mycorrhiza and free-living microbes on soil C and N cycles to reveal the potential underlying mechanisms in forests with different mycorrhizal symbioses. Third, the research methodology and new techniques need refining and applying to explicitly focus on scaling up the fine-scale measurements to better expound and predict the C and N cycles in forest ecosystems. Finally, more studies on the stability of soil organic matter among different mycorrhizal forests are needed to precisely assess responses of the structure and function of forest ecosystems to global changes.

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The effects of mycorrhizal roots on litter decomposition, soil biota, and nutrients in a spodosolic soil

Cited by 53 publications

References 50 publications

The Exotic Legume Tree Species Acacia holosericea Alters Microbial Soil Functionalities and the Structure of the Arbuscular Mycorrhizal Community

The Exotic Legume Tree Species Acacia holosericea Alters Microbial Soil Functionalities and the Structure of the Arbuscular Mycorrhizal Community

Logging residues and ground vegetation in nutrient dynamics of a clear-cut boreal forest

森林土壤碳氮循环过程的新视角: 丛枝与外生菌根树种的作用

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