Guhr, A; Borken, W; Spohn, M; Matzner, E: Redistribution of soil water by a saprotrophic fungus enhances carbon mineralization, PNAS, 112(47), 14647-14651 (2015), doi:10.1073/pnas.1514435112
Abstract:
The desiccation of upper soil horizons is a common phenomenon, leading to a decrease in soil microbial activity and mineralization. Recent studies have shown that fungal communities and fungalbased food webs are less sensitive and better adapted to soil desiccation than bacterial-based food webs. One reason for a better fungal adaptation to soil desiccation may be hydraulic redistribution of water by mycelia networks. Here we show that a saprotrophic fungus (Agaricus bisporus) redistributes water frommoist (–0.03 MPa) into dry (–9.5 MPa) soil at about 0.3 cm·min−1 in single hyphae, resulting in an increase in soil water potential after 72 h. The increase in soil moisture by hydraulic redistribution significantly enhanced carbon mineralization by 2,800% and enzymatic activity by 250–350% in the previously dry soil compartment within 168 h. Our results demonstrate that hydraulic redistribution can partly compensate water deficiency if water is available in other zones of the mycelia network. Hydraulic redistribution is likely one of themechanisms behind higher drought resistance of soil fungi compared with bacteria. Moreover, hydraulic redistribution by saprotrophic fungi is an underrated pathway of water transport in soils and may lead to a transfer of water to zones of high fungal activity.
Upcoming ...

BayCEER Colloquium:
Th. 2017-12-21
Silicon in biogeochemistry
Th. 2018-01-11
Biodiversity conservation under complex socio-ecological settings - the Colombian case
Th. 2018-01-18
Effects of climate change on plants and ecosystem functioning of managed temperate grasslands
Ökologisch-Botanischer Garten:
Su. 2018-01-07
Stärk´ anlaufen: Winterspaziergang im ÖBG
Su. 2018-01-07
Musikalischer Jahresbeginn mit den Rockin´ Dinos
Weather research site
Luftdruck (356m): 976.5 hPa
Lufttemperatur: 1.6 °C
Niederschlag: 0.7 mm/24h
Sonnenschein: <1 h/d
Wind (Höhe 17m): 9.0 km/h
Wind (Max.): 18.0 km/h
Windrichtung: W

...more