关键词: 土壤养分流失, 土壤养分流失

Abstract: In order to investigate the Pb tolerance and soil remediation effect, a pot experiment was conducted to observe the ramie growth and variation of the heavy metal in different lead stress treatment. The results showed that, Pb processing of low concentration (≤ 800 mg/kg) could promote the growth of ramie, its plant height, stem diameter and biomass showed the tendency to increase, but the 500 mg/kg stress treatment was the best. Thereafter, the inhibitory effect became obvious with increase of the stress concentration and the growth indexes reduced significantly than the control to the highest concentration 2300 mg/kg, but it still completed the growth cycle, which indicated ramie had a strong tolerance to Pb stress. The lead content of ramie roots and shoots increased with the concentration increasing (≤ 800 mg/kg range) and the highest values were 173.59 mg/kg, and 92.31 mg/kg respectively. The largest accumulation amount of Pb in shoot reached 1188.36 μg/pot, accounting for 35.47% of whole plant. The Pb factors of bioaccumulation and transfer were 0.04-0.06 and 0.50-0.73 respectively. Thence, the lead enrichment capacity of ramie was limited, but it had better transport capacity. With a view of its well-developed root system and large shoot biomass, etc., it is still the desirable plants of heavy metal Pb-contaminated soil remediation.