Poplar for the phytomanagement of boron contaminated sites |
| |
Authors: | Robinson B H Green S R Chancerel B Mills T M Clothier B E |
| |
Institution: | Institute of Terrestrial Ecosystems, Swiss Federal Institute of Technology (ETH), Universit?tstrasse 16, CH-8092 Zürich, Switzerland. brett.robinson@env.ethz.ch |
| |
Abstract: | Boron (B) is a widespread environmental contaminant that is mobile relative to other trace elements. We investigated the potential of hybrid poplar (Populus sp.) for B phytomanagement using a lysimeter experiment and a field trial on B-contaminated wood-waste. In both studies, poplars enhanced evapotranspiration from the wood-waste, reduced B leaching, and accumulated B in the aerial portions of the tree. When grown in a substrate containing 30 mg/kg B, poplar leaves had an average B concentration of 845 mg/kg, while the stems contained 21 mg/kg B. Leaf B concentrations increased linearly with leaf age. A decomposition experiment revealed that abscised leaves released 14% of their B during the winter months. Fertiliser application enhanced tree growth without decreasing the leaf B concentrations. Harvesting alternate rows of trees on a contaminated site would reduce leaching from the site while removing B. Harvested plant material may provide bioenergy, stock fodder, or an amendment for B-deficient soils. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|