景观植物结合改良剂修复盐和锌锰复合污染土壤

盆栽试验条件下，通过向污染土壤施加组配改良剂（TH-SM01）、种植景观植物，研究植物对盐、Zn和Mn的耐受能力，及TH-SM01对土壤全盐量、Zn、Mn有效态含量的影响，结果表明:鹤望兰（Strelitzia reginae Aiton）具有较强的耐盐和耐Zn、Mn能力，在重度盐、Zn和Mn复合污染土壤上可优先使用；红花檵木（Loropetalum chinense（R.Br.）Oliver var.rubrum Yieh）、含笑花（Michelia figo（Lour.）Spreng.）、桂花（Osmanthus fragrans（Thunb.）Loureiro）、叶子花（Bougainvillea spectabilis Willd.）对盐的耐受能力亚于鹤望兰，但仍可在TH-SM01的施用下生长，且含笑花、叶子花具有超富集Mn的能力；向土壤中施加TH-SM01可降低土壤全盐量，且种植3个月后TH-SM01仍可以继续发挥脱盐作用；TH-SM01可提高土壤pH，但随着施用时间延长，提高幅度在缩小，且TH-SM01可以降低土壤DTPA-Zn、DTPA-Mn含量，尤其是DTPA-Mn，种植3个月降低率达到94.45%~96.21%。因此，在修复重度盐、Zn和Mn复合污染土壤时，可通过施加TH-SM01和种植耐盐及耐Zn、Mn植物，以降低土壤全盐量和DTPA-Zn、DTPA-Mn含量。

REMEDIATION OF SOIL CONTAMINATED WITH SALT,ZINC AND MANGANESE BY LANDSCAPE PLANTS AND MODIFIER

In order to provide a basis for the remediation of severely contaminated soil with salt, Zn and Mn, a pot experiment was conducted by adding combined modifier (TH-SM01) to the polluted soil and planting landscape plants. The salt, Zn and Mn tolerance capacity of plants, and the effect of TH-SM01 on the soil total salt content, Zn and Mn available contents were studied in the experiment. The results showed that bird of paradise flower (Strelitzia reginae Aiton) had strong salt, Zn and Mn tolerance, and could be used preferentially in the heavy salt, Zn and Mn contaminated soil. The salt tolerance of the four plants, redflowered loropetalum (Loropetalum chinense (R. Br.) Oliver var. rubrum Yieh), michelia figo (Michelia figo (Lour.) Spreng.), fragrant flower (Osmanthus fragrans (Thunb.) Loureiro), and bougainvillea glabra (Bougainvillea spectabilis Willd.) were inferior to that of birdofparadise flower, but they could still grow with TH-SM01 applying. In addition, michelia figo and bougainvillea glabra could hyperaccumulate Mn. Adding TH-SM01 into the soil could reduce the soil total salt content, and TH-SM01 could continue to play the role of desalination after being planted for three months. TH-SM01 could increase soil pH, but the increase trend was decreasing with the extension of applying time. At the same time, TH-SM01 could reduce the content of DTPA-Zn and DTPA-Mn in soil, especially DTPA-Mn content. The reduction rate of DTPA-Mn content was 94.45%~96.21% after being planted for three months. Therefore, the measure that applying TH-SM01 to reduce salt, DTPA-Zn, DTPA-Mn content in soil, and planting tolerant plants, to remediate severely contaminated soil with salt, Zn and Mn, was proved to be feasible.