Periodicity of Fine Root Growth in Jarrah (Eucalyptus marginata Donn Ex Sm.)

1983 ◽  
Vol 31 (3) ◽  
pp. 247 ◽  
Author(s):  
B Dell ◽  
IM Wallace
Keyword(s):  
Root Growth ◽  
Fine Root ◽  
Phytophthora Cinnamomi ◽  
Late Summer ◽  
Late Winter ◽  
Summer Drought ◽  
Root Pathogen ◽  
Eucalyptus Marginata ◽  
Fine Root Growth ◽  
Mycorrhizal Roots

The timing of new surface root growth in jarrah (Eucalyptus marginata) was followed for a 15-month period in the field. The periodicity of new root growth was similar for long roots, non-mycorrhizal and mycorrhizal root clusters. Root growth was initiated during two peak periods in spring (September-October) and following autumn rain (May-June). Little new root activity was recorded in late winter (August) or during summer drought. Rapid root growth occurred within 2 days of a storm (47 mm rain) in February. In addition, short roots formed after very light showers of rain (<5 mm) in late summer. Much of the framework for fine feeder roots was built up after autumn rain. In contrast to new long root growth which was equally spread between spring and late autumn, the majority of new mycorrhizal roots were produced from May to July. Root growth ceased when warm surface soils dried out and commenced when the soils were moist after rain. Much of the new root growth in jarrah occurred when the root pathogen Phytophthora cinnamomi was active in the soil.

Structure of the Surface Root System of Eucalyptus Marginata Sm. And Its Infection by Phytophthora Cinnamomi Rands

1981 ◽  
Vol 29 (1) ◽  
pp. 49 ◽  
Author(s):  
SR Shea ◽  
B Dell
Keyword(s):  
Root System ◽  
Phytophthora Cinnamomi ◽  
Lateral Roots ◽  
High Density ◽  
Summer Drought ◽  
Eucalyptus Marginata ◽  
Mycorrhizal Roots ◽  
Small N ◽  
A Site

The structure of the surface root system of jarrah (Eucalyptus marginata) trees was examined on a number of freely drained upland sites with different fire and management histories. The roots typically occurred in patches but in some stands formed extensive sheets. On excavation; this surface root system was composed of pads ranging in size from 10 cm to 1-3 m in diameter and c. 5 cm thick. The pads consist of short roots 1-3 mm long (which commonly form dense clusters around lateritic pebbles) which arise from small (n - 1)*th order laterals 0.5-1.5 cm long connected to (n - 2)*th order laterals 2-5 cm long and up to 0.7 mm in diameter. Mycorrhizal roots were common throughout the surface root pads. During the summer drought many of the short lateral roots die but the main framework of the roots of the surface pads is perennial. Following rains or irrigation, new, short lateral roots form rapidly from the framework of roots in the surface pads. Phytophthora cinnamomi was consistently recovered from short lateral roots and from the perennial roots (n - 1, n - 2) which form the framework of the root pads at a site in diseased forest where a high density of P. cinnamomi had been induced in the soil by irrigation. We hypothesize that the destruction of some of the perennial components of the root pads could explain why P. cinnamonzi can cause the decline and death of jarrah in an environment only marginally favourable for the fungus.

Eucalyptus tree influence on spatial and temporal dynamics of fine-root growth in an integrated crop-livestock-forestry system in southeastern Brazil

Rhizosphere ◽  
2021 ◽  
pp. 100415
Author(s):  
Wanderlei Bieluczyk ◽  
Marisa de Cássia Piccolo ◽  
Marcos Gervasio Pereira ◽  
George Rodrigues Lambais ◽  
Moacir Tuzzin de Moraes ◽  
...  
Keyword(s):  
Root Growth ◽  
Fine Root ◽  
Temporal Dynamics ◽  
Southeastern Brazil ◽  
Spatial And Temporal Dynamics ◽  
Fine Root Growth

ModellingSonchus arvensisroot biomass allocation to below-ground shoot and fine root growth

2016 ◽  
Vol 66 (6) ◽  
pp. 476-482
Author(s):  
Bengt Torssell ◽  
Henrik Eckersten ◽  
Anneli Lundkvist ◽  
Theo Verwijst
Keyword(s):  
Root Growth ◽  
Biomass Allocation ◽  
Fine Root ◽  
Fine Root Growth ◽  
Below Ground

Pre- and post-harvest fine root growth in Eucalyptus grandis stands installed in sandy and loamy soils

2007 ◽  
Vol 246 (2-3) ◽  
pp. 186-195 ◽  
Author(s):  
Sergio Luis de Miranda Mello ◽  
José Leonardo de Moraes Gonçalves ◽  
José Luiz Gava
Keyword(s):  
Root Growth ◽  
Fine Root ◽  
Eucalyptus Grandis ◽  
Post Harvest ◽  
Fine Root Growth

scholarly journals Peatland warming strongly increases fine-root growth

2020 ◽  
Vol 117 (30) ◽  
pp. 17627-17634
Author(s):  
Avni Malhotra ◽  
Deanne J. Brice ◽  
Joanne Childs ◽  
Jake D. Graham ◽  
Erik A. Hobbie ◽  
...  
Keyword(s):  
Climate Change ◽  
Root Growth ◽  
Fine Root ◽  
Growing Season ◽  
Ambient Conditions ◽  
Climate Change Responses ◽  
Fine Root Growth ◽  
Root Response ◽  
Root Responses ◽  
Northern Peatlands

Belowground climate change responses remain a key unknown in the Earth system. Plant fine-root response is especially important to understand because fine roots respond quickly to environmental change, are responsible for nutrient and water uptake, and influence carbon cycling. However, fine-root responses to climate change are poorly constrained, especially in northern peatlands, which contain up to two-thirds of the world’s soil carbon. We present fine-root responses to warming between +2 °C and 9 °C above ambient conditions in a whole-ecosystem peatland experiment. Warming strongly increased fine-root growth by over an order of magnitude in the warmest treatment, with stronger responses in shrubs than in trees or graminoids. In the first year of treatment, the control (+0 °C) shrub fine-root growth of 0.9 km m−2y−1increased linearly by 1.2 km m−2y−1(130%) for every degree increase in soil temperature. An extended belowground growing season accounted for 20% of this dramatic increase. In the second growing season of treatment, the shrub warming response rate increased to 2.54 km m−2°C−1. Soil moisture was negatively correlated with fine-root growth, highlighting that drying of these typically water-saturated ecosystems can fuel a surprising burst in shrub belowground productivity, one possible mechanism explaining the “shrubification” of northern peatlands in response to global change. This previously unrecognized mechanism sheds light on how peatland fine-root response to warming and drying could be strong and rapid, with consequences for the belowground growing season duration, microtopography, vegetation composition, and ultimately, carbon function of these globally relevant carbon sinks.

Relationships among litterfall, fine-root growth, and soil respiration for five tropical tree species

2007 ◽  
Vol 37 (10) ◽  
pp. 1954-1965 ◽  
Author(s):  
Oscar J. Valverde-Barrantes
Keyword(s):  
Soil Respiration ◽  
Root Growth ◽  
Tree Species ◽  
Fine Root ◽  
Tropical Tree ◽  
Root Production ◽  
Fine Root Production ◽  
Soil C ◽  
Tropical Tree Species ◽  
Fine Root Growth

Although significant advances have been made in understanding terrestrial carbon cycling, there is still a large uncertainty about the variability of carbon (C) fluxes at local scales. Using a carbon mass-balance approach, I investigated the relationships between fine detritus production and soil respiration for five tropical tree species established on 16-year-old plantations. Total fine detritus production ranged from 0.69 to 1.21 kg C·m–2·year–1 with significant differences among species but with no correlation between litterfall and fine-root growth. Soil CO2 emissions ranged from 1.61 to 2.36 kg C·m–2·year–1 with no significant differences among species. Soil respiration increased with fine-root production but not with litterfall, suggesting that soil C emissions may depend more on belowground inputs or that both fine root production and soil respiration are similarly influenced by an external factor. Estimates of root + rhizosphere respiration comprised 52% of total soil respiration on average, and there was no evidence that rhizosphere respiration was associated with fine-root growth rates among species. These results suggest that inherent differences in fine-root production among species, rather than differences in aboveground litterfall, might play a main role explaining local-scale, among-forest variations in soil C emissions.

scholarly journals Effects of water and nutrient availability on fine root growth in eastern Amazonian forest regrowth, Brazil

2010 ◽  
Vol 187 (3) ◽  
pp. 622-630 ◽  
Author(s):  
Tâmara Thaiz Santana Lima ◽  
Izildinha Souza Miranda ◽  
Steel Silva Vasconcelos
Keyword(s):  
Root Growth ◽  
Nutrient Availability ◽  
Fine Root ◽  
Amazonian Forest ◽  
Forest Regrowth ◽  
Fine Root Growth

Fine root growth dynamics of four Mojave Desert shrubs as related to soil moisture and microsite

2004 ◽  
Vol 56 (1) ◽  
pp. 129-148 ◽  
Author(s):  
Carolyn S Wilcox ◽  
Joseph W Ferguson ◽  
George C.J Fernandez ◽  
Robert S Nowak
Keyword(s):  
Soil Moisture ◽  
Root Growth ◽  
Mojave Desert ◽  
Fine Root ◽  
Growth Dynamics ◽  
Desert Shrubs ◽  
Fine Root Growth

The effects of forest liming on fertilization on fine-root growth

1990 ◽  
Vol 54 (1) ◽  
pp. 365-375 ◽  
Author(s):  
Hans Persson ◽  
Kerstin Ahlstr�m
Keyword(s):  
Root Growth ◽  
Fine Root ◽  
Fine Root Growth ◽  
Forest Liming
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