Root distribution in a Norway spruce (Picea abies (L.) Karst.) stand subjected to drought and ammonium-sulphate application

Persson, Henrik J.; Fircks, Yuehua von; Majdi, Hooshang; Nilsson, Lars

doi:10.1007/978-94-011-0455-5_17

Cited by 44 publications

(33 citation statements)

References 9 publications

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“…The capacitance effects in trees have been described elsewhere (e.g. Schulze et al [33], Carlson and Lynn [5], Machado and Tyree [25] and Köstner et al [19] [3,13], reduced surface root growth [2] and reallocation of root growth to deeper layers [29], whereas other studies show an increased root growth under drought [11]. Our This will be the topic of our next study.…”

Section: Site Descriptionmentioning

confidence: 59%

Water flux in boreal forest during two hydrologically contrasting years; species specific regulation of canopy conductance and transpiration

Clenciala

Kučera²,

Ryan

et al. 1998

Ann. For. Sci.

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-We estimated the reduction of transpiration from drought for tree species in a mixed boreal 60-year-old stand in central Sweden. Actual transpiration was estimated from direct measurements of sap flow rate in Pinus sylvestris and Picea abies trees during two consecutive years with contrasting precipitation. Drought-induced reduction of transpiration (transpiration deficit) was quantified as the difference between the measured sap flow and the transpiration calculated for non-limiting soil water conditions. The drought-free transpiration was estimated on

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Section: Site Descriptionmentioning

confidence: 59%

Water flux in boreal forest during two hydrologically contrasting years; species specific regulation of canopy conductance and transpiration

Clenciala

Kučera²,

Ryan

et al. 1998

Ann. For. Sci.

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“…Fine roots are sensitive to changes in temperature and moisture in the soil (Lindstro$ m, 1986 ;Tabbush, 1986 ;Husted & Lave! nder, 1989 ;Vapaavuori et al, 1992 ;Persson et al, 1995). Because the mycorrhizal colonization of the roots was apparently not affected (close to 100%) in both treatments, the main explanation for the smaller numbers of mycorrhizas in the humus layer is likely to be a decrease in the numbers of fine roots available for colonization.…”

Section: mentioning

confidence: 96%

Effects of repeated harvesting of forest residues on the ectomycorrhizal community in a Swedish spruce forest

1999

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The use of biofuels has been proposed as one possible substitute for fossil fuels, which contribute substantially to the increase in [CO # ] in the atmosphere. However, increased harvesting of forest residues for biofuel might affect the availability of base cations, P and N, as well as the development, community dynamics and function of ectomycorrhizas. This in turn might influence nutrient uptake and tree growth. In this study we investigated the effects of repeated forest residue harvesting on ectomycorrhizal species colonizing spruce roots in the humus layer of a 35-yr-old forest. Harvesting significantly decreased the thickness of the humus layer as well as decreasing the numbers of ectomycorrhizal root tips both per metre root length and per unit humus volume. Changes in mycorrhizal community structure were studied by ITS typing with the use of PCR-RFLP analysis. In total, 19 different ITS types were found on two different sampling occasions (autumn and spring) ; 11 of these were common to both samplings. Nine of the ITS types were identified to at least the genus level by comparison with RFLP patterns of identified fruiting bodies or axenic cultures. Five species, Cortinarius sp. 2, Thelephora terrestris (Ehrenb.) Fr., Lactarius theiogalus (Bull. :Fr.) S. F. Gray s.st. Neuhoff, Tylospora fibrillosa Donk and To$ -96-12, occurred on over 5% of the total sampled root tips. Together these five types colonized 63% of the mycorrhizas screened. A similarity index assessment showed no shift in mycorrhizal community structure as a result of harvesting. Our findings suggest that the repeated removal of forest residues might have a strong effect on the quantity and development of ectomycorrhizal roots in the organic horizon, but little effect on the species composition of the community.

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“…Nevertheless, shallow root mortality is fairly common (see Eissenstat and Yanai 1997). A previous study on Picea abies found high fine root mortality in response to drought (Persson et al 1995). Alder et al (1996) found a 60 % loss of hydraulic conductance in roots of Acer grandidentatum, but a much smaller loss in stems, during a drought year.…”

Section: Discussionmentioning

confidence: 97%

Role of aquaporin activity in regulating deep and shallow root hydraulic conductance during extreme drought

Johnson

Sherrard

Domec

et al. 2014

Trees

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Key message Deep root hydraulic conductance is upregulated during severe drought and is associated with upregulation in aquaporin activity. Abstract In 2011, Texas experienced the worst single-year drought in its recorded history and, based on tree-ring data, likely its worst in the past millennium. In the Edwards Plateau of Texas, rainfall was 58 % lower and the mean daily maximum temperatures were[5°C higher than long-term means in June through September, resulting in extensive tree mortality. To better understand the balance of deep and shallow root functioning for water supply, we measured root hydraulic conductance (K R ) in deep (*20 m) and shallow (5-10 cm) roots of Quercus fusiformis at four time points in the field in 2011. Deep roots of Q. fusiformis obtained water from a perennial underground (18-20 m) stream that was present even during the drought. As the drought progressed, deep root K R increased 2.6-fold from early season values and shallow root K R decreased by 50 % between April and September. Inhibitor studies revealed that aquaporin contribution to K R increased in deep roots and decreased in shallow roots as the drought progressed. Deep root aquaporin activity was upregulated during peak drought, likely driven by increased summer evaporative demand and the need to compensate for declining shallow root K R . A whole-tree hydraulic transport model predicted that trees with greater proportions of deep roots would have as much as five times greater transpiration during drought periods and could sustain transpiration during droughts without experiencing total hydraulic failure. Our results suggest that trees shift their dependence on deep roots versus shallow roots during drought periods, and that upregulation of aquaporin activity accounts for at least part of this increase.

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Root distribution in a Norway spruce (Picea abies (L.) Karst.) stand subjected to drought and ammonium-sulphate application

Cited by 44 publications

References 9 publications

Water flux in boreal forest during two hydrologically contrasting years; species specific regulation of canopy conductance and transpiration

Water flux in boreal forest during two hydrologically contrasting years; species specific regulation of canopy conductance and transpiration

Effects of repeated harvesting of forest residues on the ectomycorrhizal community in a Swedish spruce forest

Role of aquaporin activity in regulating deep and shallow root hydraulic conductance during extreme drought

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