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Participant: part of or influencing processesPlant roots
Appears in 76 processs and 251 steps. Everything below is linked: open a process to see it in context.
Top processes
Roots and rhizosphere
15 stepsLiving soil system
13 steps- Start: Rhizosphere phosphorus mobilization: phosphatases, organic acids and fast re-sorption
- End: Rhizosphere phosphorus mobilization: phosphatases, organic acids and fast re-sorption
- Soil solution Phosphate seldom exceeds about 10 uM (often 1-2 uM), so roots deplete a zone around themselves
- and 5 more in this process
Weathering
7 steps- Start: Weathering
- End: Weathering
- Physical weathering by freeze-thaw and roots
- and 4 more in this process
Show 70 more processes
- Start: Biological weathering by roots, mycorrhizal fungi and microbes (plants speed weathering about 2-10 fold)
- End: Biological weathering by roots, mycorrhizal fungi and microbes (plants speed weathering about 2-10 fold)
- Roots and fungi receive photosynthate (10-30 percent of net primary production belowground)
- and 3 more in this process
- Start: Soil compaction: stress, density, root limitation and recovery
- End: Soil compaction: stress, density, root limitation and recovery
- Penetration resistance rises; root elongation is strongly limited above about 2 MPa and a penetrometer reads 2-8 times the pressure that roots experience
- and 2 more in this process
Mycorrhizal fungi network
4 stepsSoil gas exchange and redox
4 stepsSoil sulfur cycling
4 steps- Start: Aerenchyma, radial oxygen loss and the oxidised rhizosphere of wetland plants
- End: Aerenchyma, radial oxygen loss and the oxidised rhizosphere of wetland plants
- Radial oxygen loss leaks Oxygen into the soil, forming an oxidised zone a millimetre or so thick around roots
- and 1 more in this process
- Start: Capillary rise from shallow groundwater and salt accumulation
- End: Capillary rise from shallow groundwater and salt accumulation
- Evaporation and root uptake pull water up when K at the table depth permits: the maximum steady upward flux falls roughly as depth to the table raised to a power of 2-4
- and 1 more in this process
Plant-mediated water flux
4 steps- Infiltrating water dissolves carbonate in the wetter upper profile as soil CO2 raises carbonic acid
- Evapotranspiration removes water and CO2 degasses, so Ca2+ + 2HCO3- precipitates as CaCO3
- Pores fill and cement into a plugged horizon (Gile stage III to IV) that limits infiltration and root penetration
- Plant parasites (root-knot Meloidogyne, cyst Heterodera and Globodera, root-lesion Pratylenchus) feed on living roots
- Grazers consume more nitrogen than they need and excrete the surplus as ammonium, speeding mineralization and raising plant N uptake
- Root exudates fuel bacteria, bacterial feeders return ammonium near roots, and plants release more exudate
- Aeration is adequate above about 10% air-filled porosity, equivalent to an oxygen diffusion rate above about 0.2 microgram per cm2 per minute
- Respiration consumes O2 and produces CO2, so the steady-state CO2 excess scales with respiration divided by Ds: halving Ds doubles the excess
- Soil air at depth commonly holds 0.3-3% CO2, about 10 to 100 times atmospheric (0.04%)
Phosphorus cycling
2 stepsBiochar and charcoal in soil
2 stepsSoil fauna
2 stepsOften found with
Water 70Soil microbes 33Carbon 29Mycorrhizal fungi 28Carbon dioxide 24Organic acids 22Nitrogen 21Soil water 21Rhizosphere microbes 20Plants 19Soil solution 18Phosphate 17
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