|Dieffenbach, A; Matzner, E: In situ soil solution chemistry in the rhizosphere of mature Norway spruce (Picea abies L. Karst.) trees, Plant and Soil, 222(1), 149-161 (2000)|
Active tree roots influence the soil chemistry in their immediate vicinity, the rhizosphere. For the first time, the extent and stability of in situ concentration gradients of major cations and anions in the soil solution around tree roots were studied in the field. Micro suction cups were installed in an acidic forest soil using a root window in a 145-year-old Norway spruce stand. Samples were collected once a week during the growing season from the rhizosphere and from the bulk soil of a non-mycorrhizal long root and of a mycorrhizal root net. For comparison, micro suction cups were installed proximal and distal to a long root in a rhizotron under controlled conditions (homogenised soil, constant water potential, nutrient solution) at the same site. Small volumes of soil solutions were analysed for NH
Physical constraints and biological controls of plant-environment interactions
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