Abstract
Thousands of unlined landfills and open dumpsites have put great threat on the security of soil and ground water due to leachate leakage. Alfalfa is believed potential as a phytoremediation plant for leachate contamination based on strong root system and the excellent capacity of removing various kinds of pollutants. A lab-scale investigation was conducted to figure out the sensitiveness of alfalfa photosynthesis in response to leachate contamination. The results demonstrated that both of the maximum photosynthetic efficiency (Fv/Fm) and net photosynthetic rate (Pn) were slightly inhibited in the high-dosage group. Based on statistical analysis, higher sensitivity of Pn to leaching parameters than Fv/Fm was observed. There were significant correlations between most of leaching parameters (pH, ammonium and COD) and Pn with correlation coefficients of 0.530, −0.580 and −0.578 (p < 0.01), respectively. Therefore, Pn is potential for acting as an effective indicator for staple leaching characteristics of leachate contaminated soils.
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