Phosphorus Speciation and Nutrient Stoichiometry in the Soil-Plant System During Primary Ecological Restoration of Copper Mine Tailings

WANG Yupeng; SHEN Zhangjun; ZHANG Zhen

摘要

The effects of plant vegetation on phosphorus (P) speciation,pH,total carbon concentration,total nitrogen concentration,and alkaline phosphatase activities were investigated to explore the P uptake strategy of plants in low-P soil and to determine the nutrient stoichiometric ratio changes in the rhizosphere of plants (Imperata cylindrica,Miscanthus floridulus,Zoysia sinica,Artemisia lavandulaefolia,Indigofera pseudotinctoria,and Conyza canadensis) which had grown for approximately 15 years in copper mine tailings,East China.The results showed that the average pH values in the rhizosphere decreased by 0.06-1.37 compared with those in the non-rhizosphere.The alkaline phosphatase activities of the rhizosphere were significantly higher than those in the non-rhizosphere.The mean concentrations of aluminum (A1)-and iron (Fe)-bound P and Ca2-P (CaHPO4) in the rhizosphere of all plants were 5.4％ to 87.7％,49.2％ to 214.2％,and 86.6％ to 147.6％ higher than those in the non-rhizosphere,respectively.Except for Ca8-P (Ca8H2(PO4)6)and Cal0-P (Cal0(PO4)6(OH)2) in the rhizosphere,all kinds of inorganic P forms were negatively correlated with pH.Significant correlation was also observed among the concentrations of dominant forms of inorganic P,C,and N and alkaline phosphatase activities in the rhizosphere.Among the studied species,L pseudotinctoria showed the most significant effect on enhancing soil available P concentration.The stoichiometric ratios of C:P and N:P were apparently higher in the rhizosphere than the non-rhizosphere,whereas these ratios were far below the ratios commonly observed in Chinese soils.These results indicated that the plant growth effectively affected P fractions possibly by changing pH,C and N concentrations,and alkaline phosphatase activity,in the rhizosphere in copper mine tailings.

机译：研究了植物植被对磷（P）形态，pH，总碳浓度，总氮浓度和碱性磷酸酶活性的影响，以探讨低磷土壤中植物对磷的吸收策略，并确定养分化学计量比的变化。在华东铜矿尾矿中生长了约15年的植物（圆环菊，小芒草，结缕草，淡紫色蒿，假靛蓝和加拿大Conyza canadensis）的根际。结果表明，根际的平均pH值与非根际相比下降了0.06-1.37。根际的碱性磷酸酶活性明显高于非根际。铝（A1）和铁（Fe）结合的磷和所有植物的根际中的Ca2-P（CaHPO4）比非根际中的分别高5.4％至87.7％，49.2％至214.2％和86.6％至147.6％。根际中除了Ca8-P（Ca8H2（PO4）6）和Cal0-P（Cal0（PO4）6（OH）2）以外，其他各种无机P形态均与pH呈负相关。根际中无机磷，碳和氮的主要形式的浓度以及碱性磷酸酶的活性。在被研究物种中，假伪铁线兰对提高土壤有效磷的浓度具有最显着的影响。化学计量比C：P和N：P这些比例明显低于中国土壤中常见的比例。这些结果表明，植物生长可能通过改变pH，C和N浓度以及碱性磷酸酶有效地影响了P部分。活性，在根际中的铜矿尾矿。

Phosphorus Speciation and Nutrient Stoichiometry in the Soil-Plant System During Primary Ecological Restoration of Copper Mine Tailings

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