Response of Populus tremula to heterogeneous B distributions in soil |
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Authors: | Rainer Rees Brett H Robinson Michael W H Evangelou Eberhard Lehmann Rainer Schulin |
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Institution: | 1. Institute of Terrestrial Ecosystems, ETH Zurich, Universit?tstrasse 16, 8092, Zürich, Switzerland 2. Soil and Physical Sciences, Burns 222, Lincoln University, PO Box 84, Lincoln 7647, Christchurch, New Zealand 3. Spallation Neutron Source Division, Paul-Scherrer-Institut, 5232, Villigen PSI, Switzerland
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Abstract: | Background Poplars accumulate inordinate amounts of B in their leaves and are candidate plants for the remediation of B contaminated soil. We aimed to determine the effect of heterogeneous B distribution in soil by comparing the growth and B accumulation of young Populus tremula trees growing in soil with heterogeneous and homogeneous B distributions. Methods The first of two experiments focused on the tolerance and B accumulation of P. tremula under heterogeneous soil B distributions, while the second was designed to study fine root growth under such conditions in detail. Results Growth and B accumulation of P. tremula were unaffected by the spatial distribution of B. Root and shoot growth were both reduced simultaneously when leaf B concentrations increased above 800 mg kg?1. In the heterogeneous soil B treatments, root growth was more reduced in spiked soil portions with B concentrations >20 mg kg?1. Fine root length growth was stronger inhibited by B stress than secondary growth. Conclusions The root growth responses of P. tremula to B are primarily a systemic effect induced by shoot B toxicity and local toxicity effects on roots become dominant only at rather high soil B concentrations. Local heterogeneity in soil B should have little influence on the phytoremediation of contaminated sites. |
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