[1]ZHENG Zhilin,LUO Youfa,ZHOU Jiajia,et al.The Fraction Characteristics of Phosphorus in the Rhizosphere of Four Pioneer Restoration Plants in Lead-Zinc Waste Slag Yards[J].Research of Soil and Water Conservation,2019,26(03):269-278.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
26
Number of periods:
2019 03
Page number:
269-278
Column:
Public date:
2019-04-12
- Title:
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The Fraction Characteristics of Phosphorus in the Rhizosphere of Four Pioneer Restoration Plants in Lead-Zinc Waste Slag Yards
- Author(s):
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ZHENG Zhilin1, LUO Youfa1, ZHOU Jiajia1, QIU Jing1, WU Xingyu1, GAO Bingting1, WU Yonggui1,2,3
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1. College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China;
2. Institute of Applied Ecology, Guizhou University, Guiyang 550025, China;
3. Karst Eco-Environmental Engineering Research Center of Guizhou Province, Guiyang 550025, China
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- Keywords:
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lead-zinc smelting residue; phytoremediation; microdomains in the rhizosphere; phosphorus; occurrence forms
- CLC:
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X53;X171.5
- DOI:
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- Abstract:
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In order to clarify the response of phosphorus fraction characteristics in the rhizosphere microdomain of the pioneer plant grown in the lead-zinc waste slag yard of ecological restoration, the the zinc smelting waste slag yard of ecological restoration in the northwestern Guizhou Province was selected. Four species of Pioneer plants, Buddleja davidii, Chenopodam ambrosioides L., Trifolium repens, and Lolium perenne, which grew well in the area, were selected. The contents of inorganic phosphorus (IP), total inorganic phosphorus (TIP), available phosphorus (AP), organic phosphorus (OP) and total phosphorus (TP) in the rhizosphere micro-domains and control residues were analyzed. The results showed that compared with the control residue, the four kinds of pioneer plants could significantly reduce the pH of the waste residue matrix (p<0.05), and both the root and non-root residue were still weakly alkaline with pH value between 7.43 and 7.86; the four kinds of pioneer plants could significantly increase the accumulation of organic matter in the lead-zinc waste residue matrix; the content of organic matter in the plant root waste residue was significantly higher than the control residue (except Lolium perenne); the absorption and utilization of inorganic phosphorus in waste slag were obvious in the four species of pioneer plants; the specific characteristic was that the ratios of TIP/TP (48.17%~60.70%) and OP/TP (39.80%~51.83%) in the four pioneer plant root systems. The ratios of TIP/TP in the pioneer plant root systems were less that TIP/TP (89.97%) of the control, and to OP/TP in the pioneer plant root systems was higher that (10.03%) of the control residue. The contents of phosphorus in rhizospheric microdomains of four species of pioneer plants were higher than that of the control residues. The contents of phosphorus in the microdomains of plant rhizospheres differed due to the plant species, which represented three kinds of pioneer plants (Buddleja davidii, Chenopodinm ambrosioides L., Trifolium repens), the root rhizosphere effect was significant in the root slag, and the contents of total phosphorus, available phosphorus and inorganic phosphorus in the root waste slag were higher than those in the non-root, while those in the Lolium perenne were opposite to those in the other three plants. Five years after the phytoremediation of the lead-zinc waste slag yard, the growth of different pioneer plants promoted the biogeochemical cycling of phosphorus and organic matter in the waste slag, which could be a natural succession of the community in the slag field ecosystem or a subsequent increase in the establishment of large-scale woody plants provided favorable substrate conditions.