Effect of root mucilage and modelled root exudates on soil structure

Traoré, Oumar; Groleau-Renaud, V.; Plantureux, Sylvain; Tubeileh, A.; Boeuf-Tremblay, V.

doi:10.1046/j.1365-2389.2000.00348.x

Cited by 65 publications

(78 citation statements)

References 24 publications

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“…In addition, the absence of exudates binding on soil particles as well as re-uptake of released compounds by roots from NS would decrease the estimated exudates amount. Some authors have found that carbon exudation from roots into soil can range from 5 % to 20 % of the carbon fixed photosynthetically by plants [7,35], which is much more when compared with a maximum of 0.8 % in our experiment.…”

Section: Discussioncontrasting

confidence: 51%

Below-ground partitioning (¹⁴C) and isotopic fractionation (δ¹³C) of carbon recently assimilated by maize

Werth

Kuzyakov

2005

Isotopes in Environmental and Health Studies

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Partitioning of carbon recently assimilated by maize between shoots, roots, exudates, and CO 2 from root respiration depending on three different levels of nutrient supply (full nutrient solution (NS), 10 times diluted NS, or deionised water) was estimated by 14 C pulse labelling. A 13 C fractionation in these compartments was investigated in relation to the nutrient supply. With decreasing nutrient supply, 14 C allocation to the shoots and to the roots decreased from 76 % to 69 % and increased from 8 % to 13 % of 14 C recovery, respectively. Average percentage of 14 C in exudates and root-respired CO 2 was 0.5 % and 16 % of 14 C recovery, respectively. The concentration of the NS was not crucial for the amount of recently assimilated C recovered in exudates and CO 2 , but for the amounts in shoots and roots. For all three nutrient levels, roots were enriched in 13 C when compared with shoots and 13 C fractionation increased with decreasing nutrient supply up to 0.7 ‰. Further 13 C discrimination by exudation led to more 13 C in exudates when compared with the roots of full nutrient supply and less 13 C in exudates when compared with the roots grown in diluted NS and in deionised water. There were only small differences of <1.0 ‰ in δ 13 C values between roots and CO 2 from root respiration. A 13 C fractionation of recently assimilated C occurred between roots and exudates but was negligible for the CO 2 respired by roots.

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Section: Discussioncontrasting

confidence: 51%

Below-ground partitioning (¹⁴C) and isotopic fractionation (δ¹³C) of carbon recently assimilated by maize

Werth

Kuzyakov

2005

Isotopes in Environmental and Health Studies

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“…Sugars constitute a significant fraction of exudates, and are a main carbon source for microbes [ 6 3 7 _ T D $ D I F F ] [14,42]. Interestingly, many more sugar uptake than release systems have been described.…”

Section: Sugarsmentioning

confidence: 99%

Feed Your Friends: Do Plant Exudates Shape the Root Microbiome?

Sasse

Martinoia

Northen

2018

Trends in Plant Science

1,507

958

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“…Scanlan & Hinz (2010) proposed a conceptual model suggesting that, for a given soil water content, root occupancy in soil pore space could reduce the diameter of the soil pore throat, which in turn increases suction according to the capillary law. In addition, other biological factors such as the release of root exudates or organic acid (Grayston et al, 1997;Traoré et al, 2000) could alter the soil structure. Even though such bio-chemical root activity took place mainly within 2 mm away from the root surface (i.e.…”

Section: Effects Of Planting Density On Tree Growth and Soil Suctionmentioning

confidence: 99%

“…Different plant spacings would result in different degrees of overlap among root systems, and hence different influence zones of induced suction. Also not well understood is how different degrees of plant-plant interaction due to different planting densities would affect the growth of the root system, which has been shown to have a significant impact on the water uptake ability of roots (López et al, 2001;Garg et al, 2015a) and water retention behaviour (Grayston et al, 1997;Traoré et al, 2000;Scanlan & Hinz, 2010;Scholl et al, 2014;Leung et al, 2015aLeung et al, , 2015bNg et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Effects of planting density on tree growth and induced soil suction

Leung

et al. 2016

Géotechnique

120

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Plant evapotranspiration is recognised to affect soil suction of slopes and landfill covers. Previous work has focused on evapotranspiration-induced suction by a single plant, with little attention paid to the effects of planting density. The aim of this study is to quantify any changes in tree growth and tree-induced suction during evapotranspiration and rainfall under different planting densities for non-mixed-species plantations. A tree species, Schefflera heptaphylla, which is commonly found in Asia, was planted in silty sand at spacings of 60, 120 and 180 mm, representing three different planting densities. For each case, three replicates were tested to consider tree variability. In total, the responses of suction for 297 seedlings subjected to drying and a rainfall event with a 10-year return period were measured. The test results show that reducing the tree spacing from 180 to 60 mm induced greater tree-tree competition for water, as indicated by a 364% increase in peak suction upon evapotranspiration. Such tree-tree interaction led to: (a) a 19-35% reduction in the leaf area index; (b) a 17-36% decrease in root length; and (c) an obvious decay of roots. Upon the rainfall event, the infiltration rate for vegetated soil with trees planted at a spacing of 60 mm was up to 247% higher than those for soil with a wider tree spacing, where mainly fresh roots were found. Although most suction within the root zone (i.e. top 100 mm) was lost due to increased infiltration at 60 mm spacing, suctions in deeper depths below root zone were largely preserved.

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Effect of root mucilage and modelled root exudates on soil structure

Cited by 65 publications

References 24 publications

Below-ground partitioning (¹⁴C) and isotopic fractionation (δ¹³C) of carbon recently assimilated by maize

Below-ground partitioning (¹⁴C) and isotopic fractionation (δ¹³C) of carbon recently assimilated by maize

Feed Your Friends: Do Plant Exudates Shape the Root Microbiome?

Effects of planting density on tree growth and induced soil suction

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Effect of root mucilage and modelled root exudates on soil structure

Cited by 65 publications

References 24 publications

Below-ground partitioning (14C) and isotopic fractionation (δ13C) of carbon recently assimilated by maize

Below-ground partitioning (14C) and isotopic fractionation (δ13C) of carbon recently assimilated by maize

Feed Your Friends: Do Plant Exudates Shape the Root Microbiome?

Effects of planting density on tree growth and induced soil suction

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Product

Resources

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Below-ground partitioning (¹⁴C) and isotopic fractionation (δ¹³C) of carbon recently assimilated by maize

Below-ground partitioning (¹⁴C) and isotopic fractionation (δ¹³C) of carbon recently assimilated by maize