Search

【Objective】This paper aims to select turf grass cultivars suitable for vegetation restoration in Guizhou mercury mine wasteland and mercury pollution environment.【Method】Four turfgrass cultivars suiting southern China, including Motor, Feast, Pernille, and Legend, were selected as the experimental materials. The seed germination test and soil culture test under different concentration of Hg2+ stress were conducted to explore the seed germination and seedling growth of four cultivars.【Result】With Hg2+concentration increasing, the germination rate,germination potential,germination index and vigor index of the four cultivars were obviously inhibited. The tolerance limit of Feast and Motor was 120 mg/L; In the range of experimental treatment, the seed germination rate of the four cultivars was Pernille>Legend>Feast>Motor. The growth of the four cultivars was inhibited by high Hg2+ concentration, and the survival rate of the four cultivars decreased with the Hg2+ increasing. When the concentration of Hg2+ reached 100 mg/kg,the survival rate of the four cultivars was Feast>Pernille>Legend >Motor.【Conclusion】In the range of experiment,the comprehensive growth of Feast under Hg2+stress was the best. However, Feast showed stronger enrichment ability in mercury-containing 25 mg/kg soil, which was suitable for restoration of low-mercury soil and establishment of lawn, Legend had the strongest ability to enrich mercury in mercury-containing 50 and 100 mg/kg soil, which was suitable for restoration of high-mercury soil and establishment of lawn. [ABSTRACT FROM AUTHOR]

Soil nutrient is the basis for stable and high crop yield. Mastering soil's nutrient content of cultivated land is the precondition for　implementing soil test and formula fertilization. Investigations of soil's pH value and nutrient of vegetable land, paddy field and fruit land in Guizhou Anshun area were carried out in this paper. The results showed that soil's pH value of cultivated land in Guizhou Anshun area was lower than 7, and the soil was overall acidic; soil nutrient was sufficient, the organic matter, total nitrogen, total phosphorus and total kalium content were in the middle and upper level, but there were significant differences among different districts. The pH value was 5.75 on average and the range of measurement was 4.65-6.2; the value of organic matter on average was 31.13g/kg and the range of measurement was 13.07-94.55g/kg; the value of total nitrogen was 1.74g/kg on average and the range of measurement was 0.73-3.97g/kg; the total phosphorus value was 0.998g/kg on average and the range of measurement was 0.44-1.91g/kg; potassium value was 16.5g/kg on average and the range of measurement was 2.5-42.5g/kg. The soil's pH value for Guanling > Pingba > Puding > Ziyun > Zhenning ≥ Xixiu, the content of organic matter for Xixiu > Puding > Guanling > Ziyun > Pingba > Zhenning, the content of total nitrogen for Xixiu > Guanling > Ziyun > Puding > Pingba > Zhenning, the content of total phosphorus Puding > Guanling > Zhenning > Pingba > Ziyun > Xixiu, the content of total kalium for Puding > Pingba > Zhenning > Guanling > Xixiu > Ziyun. The difference of nutrients in different soil types was significant. The main nutrient content was highest in paddy soil, lowest in fruit land，and vegetable soil's nutrient was in between. There was a significant difference with the same soil type and the same nutrient content. The difference was the largest in organic content and was small in other nutrients. Therefore, this investigation has basically mastered the cultivated land soil's pH value and organic matter, total nitrogen, total phosphorus and total kalium content and distribution in Anshun, which can provide the decision-making reference for soil test and formula fertilization in regional land. [ABSTRACT FROM AUTHOR]