期刊论文

中文

环境科学

0250-3301

2014

35

3

1119-1124

10.13227/j.hjkx.2014.03.042

海南省高等学校科研项目（Hjkj2013-46）； 国家自然科学基金项目（30770389）； 三亚市院地科技合作项目（2012YD51）； 三亚学院***项目；

本校为其他机构

通过实验室模拟,研究了不同浓度硫脲与尿素配施后,对酸性红壤的PH值及其金属元素有效性的影响.结果表明,土壤施加尿素后,其PH值有先升高后逐渐下降的趋势,而硫脲与尿素配施后,其PH值的下降趋势会受到抑制,尤其是当硫脲浓度达到5.0 mmol?kg~(-1))时,土壤pH由最初的4. 65上升到6. 50以上,并在实验的中后期一直维持在6. 0以上.硫脲和尿素配施后,Cu的有效态含量受硫脲浓度的影响较小,Zn、Al的有效态含量随着硫脲浓度的升高而降低,Mn的有效态含量在高浓度硫脲下,其含量保持在一个较高的水平,达到110 mg-kg~(-1))以上.对于Cu、Zn和Al来说,在不同浓度硫脲和尿素配施后,其有效态含量与土壤的PH值呈现出明...

Through the simulation research, the effects of application of thiourea and urea on pH and availability of metal ions in acid red soil were studied, and the results showed that after applying urea, the soil pH increased in the first experimental stage and then reduced gradually to a low level, however, decreased trends of soil pH values were inhibited by the application of thiourea, especially when the concentration of thiourea reached to 5.0 mmol x kg(-1) dry soil, the soil pH was stable at high level, which exceeded to 6.0. It proved that the application of thiourea could inhibit the soil ac...