Diel patterns of fine root respiration in a dryland shrub, measured in situ over different phenological stages

2015 ◽  
Vol 21 (1) ◽  
pp. 31-42 ◽  
Author(s):  
Zongrui Lai ◽  
Su Lu ◽  
Yuqing Zhang ◽  
Bin Wu ◽  
Shugao Qin ◽  
...  
Keyword(s):  
Root Respiration ◽  
Fine Root ◽  
Phenological Stages ◽  
Diel Patterns

Intraspecific variation in fine root respiration and morphology in response to in situ soil nitrogen fertility in a 100-year-old Chamaecyparis obtusa forest

Oecologia ◽  
2015 ◽  
Vol 179 (4) ◽  
pp. 959-967 ◽  
Author(s):  
Naoki Makita ◽  
Yasuhiro Hirano ◽  
Takanobu Sugimoto ◽  
Toko Tanikawa ◽  
Hiroaki Ishii
Keyword(s):  
Intraspecific Variation ◽  
Soil Nitrogen ◽  
Root Respiration ◽  
Fine Root ◽  
Chamaecyparis Obtusa ◽  
Nitrogen Fertility

Acclimation of fine root respiration to soil warming involves starch deposition in very fine and fine roots: a case study inFagus sylvaticasaplings

2015 ◽  
Vol 156 (3) ◽  
pp. 294-310 ◽  
Author(s):  
Antonino Di Iorio ◽  
Valentino Giacomuzzi ◽  
Donato Chiatante
Keyword(s):  
Fine Roots ◽  
Root Respiration ◽  
Fine Root ◽  
Soil Warming

Responses of fine root exudation, respiration, and morphology in three early successional tree species to increased air humidity and different soil nitrogen sources

2021 ◽  
Author(s):  
Marili Sell ◽  
Ivika Ostonen ◽  
Gristin Rohula-Okunev ◽  
Linda Rusalepp ◽  
Azadeh Rezapour ◽  
...  
Keyword(s):  
Soil Nitrogen ◽  
Root Morphology ◽  
Fine Roots ◽  
Root Respiration ◽  
Fine Root ◽  
Water Flux ◽  
Nitrogen Sources ◽  
Air Humidity ◽  
Fine Root Morphology ◽  
Species Specific

Abstract Global climate change scenarios predict an increase in air temperature, precipitation, and air humidity for northern latitudes. Elevated air humidity may significantly reduce the water flux through forest canopies and affect interactions between water and nutrient uptake. However, we have limited understanding of how altered transpiration would affect root respiration and carbon (C) exudation as fine root morphology acclimates to different water flux. We investigated the effects of elevated air relative humidity (eRH) and different inorganic nitrogen sources (NO3− and NH4+) on above and belowground traits in hybrid aspen (Populus × wettsteinii Hämet-Ahti), silver birch (Betula pendula Roth.), and Scots pine (Pinus sylvestris L.) grown under controlled climate chamber conditions. The eRH significantly decreased the transpiration flux in all species, decreased root mass-specific exudation in pine, and increased root respiration in aspen. eRH also affected fine root morphology, with specific root area increasing for birch but decreasing in pine. The species comparison revealed that pine had the highest C exudation, while birch had the highest root respiration rate. Both humidity and nitrogen treatments affected the share of absorptive and pioneer roots within fine roots; however, the response was species-specific. The proportion of absorptive roots was highest in birch and aspen, the share of pioneer roots was greatest in aspen, and the share of transport roots was greatest in pine. Fine roots with lower root tissue density were associated with pioneer root tips and had a higher C exudation rate. Our findings underline the importance of considering species-specific differences in relation to air humidity and soil nitrogen availability that interactively affect the C input–output balance. We highlight the role of changes in the fine root functional distribution as an important acclimation mechanism of trees in response to environmental change.

Carbon allocation in early successional tree species at elevated air humidity and different soil nitrogen sources

2021 ◽  
Author(s):  
Marili Sell ◽  
Ivika Ostonen ◽  
Gristin Rohula-Okunev ◽  
Azadeh Rezapour ◽  
Priit Kupper
Keyword(s):  
Biomass Allocation ◽  
Tree Species ◽  
Root Respiration ◽  
Fine Root ◽  
Silver Birch ◽  
Organic Carbon Content ◽  
Climate Change Scenarios ◽  
Air Humidity ◽  
Species Specific ◽  
Exudation Rate

<p>Global climate change scenarios predict increasing air temperature, enhanced precipitation and air humidity for Northern latitudes. We investigated the effects of elevated air relative humidity (RH) and different inorganic nitrogen sources (NO<sub>3</sub><sup>-</sup>, NH<sub>4</sub><sup>+</sup>) on above- and belowground traits in different tree species, with particular emphasis on rhizodeposition rates. Silver birch, hybrid aspen and Scots pine saplings were grown in PERCIVAL growth chambers with stabile temperature, light intensity and two different air humidity conditions: moderate (mRH, 65% at day and 80% at night) and elevated (eRH, 80% at day and night). The collection of fine root exudates was conducted by a culture-based cuvette method and total organic carbon content was determined by Vario TOC analyser. Fine root respiration was measured with an infra-red gas analyser CIRAS 2.  </p><p>We analysed species-specific biomass allocation, water and rhizodeposition fluxes, foliar and fine root traits in response to changing environmental conditions. The eRH significantly decreased the transpiration flux in all species. In birch the transpiration flux was also affected by the nitrogen source. The average carbon exudation rate for aspen, birch and pine varied from 2 to 3  μg C g<sup>-1</sup> day <sup>-1</sup>. The exudation rates for deciduous tree species tended to increase at eRH, while conversely decreased for coniferous trees (p=0.045), coinciding with the changes in biomass allocation. C flux released by fine root respiration varied more than the fine root exudation, whereas the highest root respiration was found in silver birch and lowest in aspen. At eRH the above and belowground biomass ratio in aspen increased, at the expense of decreased root biomass and root respiration.  </p><p>Moreover, eRH significantly affected fine root morphology, whereas the response of specific root area was reverse for deciduous and coniferous tree species. However, fine roots with lower root tissue density had higher C exudation rate. Our findings underline the importance of considering species-specific differences by elucidating tree’s acclimation to environmental factors and their interactions.   </p>

Soil CO2 efflux and root respiration at three sites in a mixed pine and spruce forest: seasonal and diurnal variation

2001 ◽  
Vol 31 (5) ◽  
pp. 786-796 ◽  
Author(s):  
Britta Widén ◽  
Hooshang Majdi
Keyword(s):  
Diurnal Variation ◽  
Temperature Sensitivity ◽  
Root Respiration ◽  
Fine Root ◽  
Mixed Forest ◽  
Distribution Patterns ◽  
Co2 Efflux ◽  
Root Temperature ◽  
Coarse Root ◽  
N Concentration

Soil CO2 efflux and respiration of excised roots were measured with a LI-COR 6200 at three sites in a mixed forest (60°05'N, 17°3'E), from May to October 1999, both day and night. Fine-root (<5 mm in diameter) respiration was measured at ambient root temperature and soil CO2 partial pressure, and the roots were analysed for nitrogen (N) concentration. Root-density data obtained from soil cores were used to estimate fine-root biomass. Coarse-root respiration was estimated using stand data, literature data, and allometric relationships. Soil CO2 efflux, 3.0–7.0 µmol·m–2·s–1, differed between sites but showed no diurnal variation. Maximum values were obtained in July through August. Fine-root respiration, 0.3–4.7 nmol·g–1·s–1, decreased after peaking in early July and showed no diurnal variation. The seasonal mean was lowest at the South site, where also root distribution patterns were different and root N concentrations were lower. Fine-root respiration increased with root N concentration; however, the relationship was very weak, since the variation in root N concentration between sites and times of year was small. Both soil CO2 efflux and fine-root respiration increased exponentially with soil and root temperature, respectively, although fine-root respiration was twice as sensitive. The percentage of soil CO2 efflux emanating from roots was 33–62% in May, thereafter decreasing to 12–16% in October. This, in combination with larger temperature sensitivity for fine-root respiration, is suggested to cause the temperature sensitivity of soil CO2 efflux to diminish over the season.

scholarly journals Fine root respiration is more strongly correlated with root traits than tree species identity

Ecosphere ◽  
2019 ◽  
Vol 10 (11) ◽  
Author(s):  
Eva Paradiso ◽  
Fiona Jevon ◽  
Jaclyn Matthes
Keyword(s):  
Tree Species ◽  
Root Respiration ◽  
Fine Root ◽  
Root Traits ◽  
Strongly Correlated ◽  
Species Identity

Changes in very fine root respiration and morphology with time since last fire in a boreal forest

2016 ◽  
Vol 402 (1-2) ◽  
pp. 303-316 ◽  
Author(s):  
Naoki Makita ◽  
Jukka Pumpanen ◽  
Kajar Köster ◽  
Frank Berninger
Keyword(s):  
Boreal Forest ◽  
Root Respiration ◽  
Fine Root
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