【真菌导致的土壤水再分布】Alexander Guhr¹Werner BorkenMarie Spohn andEgbert Matzner. Redistribution of soil water by a saprotrophic fungus enhances carbon mineralization. PNAS 2015 doi: 10.1073-pnas.1514435112

    一项研究发现，与土壤细菌相比，真菌菌丝能够让潮湿土壤中的水再分布到干燥的土壤区域，增加干燥土壤的酶活动率和碳利用，并且为真菌带来耐旱性。(来源：EurekAlert!)

    媒体联系人：Alexander Guhr，德国拜罗伊特大学土壤生态学系 Department of Soil Ecology University of Bayreuth GERMANY; 电话：+49(0)921-55-5761; 电子邮件：alexander.guhr@uni-bayreuth.de

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 fungal-based 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 from moist (–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 2800% 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 the mechanisms 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 fun