Record ID No. |
3006 |
Author(s) |
Jeyakumar P., Loganathan P., Anderson C W N., Sivakumaran S., McLaren R G. , 2010 |
Affiliation |
A Soil and Earth Sciences, Institute of Natural Resources, Massey University, Palmerston North, New Zealand, email:j.jeyakumar@massey.ac.nz |
Title |
Response of Pinus radiata and soil microbial activity to increasing copper and zinc contamination in a soil treated with metal-amended biosolids |
Source. Vol.(no):Page |
Proceedings of the 19th World Congress of Soil Science, 215-218p. |
Categories |
Mycorrhiza General |
Subjects |
General |
Sub-subjects |
Soil pollution |
Host |
Pinus radiata |
Organism |
Mycorrhiza |
Country |
New Zealand, Australia |
Abstracts |
The effects of elevated concentrations of copper (Cu) and zinc (Zn) in a soil treated with biosolids previously spiked with these metals on Pinus radiata were investigated in a 312 day glasshouse pot trial. The total soil metal concentrations in the treatments were 16, 48, 146 and 232 mg Cu/kg and 36, 141, 430 and 668 mg Zn/kg. Increased total soil Cu concentration increased the soil solution Cu concentration (0.03 to 0.54 mg/L) but had no effect on leaf and root dry matter contents. Increased total soil Zn concentration also increased the soil solution Zn concentration (0.9 to 362 mg/L). Decreased leaf and root dry matter were recorded above the second level of Zn. Neither Cu nor Zn had any effect on the mycorrhizal colony of P. radiata. A lower percentage of Cu in the soil exchangeable fraction (5-12%) and lower Cu2+ concentration in soil solution (0.001-0.06 micro M) relative to Zn (soil exchangeable fraction, 12-66%; soil solution Zn2+ concentration, 4.5-4419 micro M) indicated lower bioavailability of Cu. Soil dehydrogenase activity decreased with every successive level of Cu and Zn applied. It was reduced by 50% at the total solution-phase Cu and Zn concentrations of 0.3 and 38 mg/L, respectively, and solid-phase exchangeable Cu and Zn concentrations of 8 and 185 mg/kg, respectively.
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