磷富集矿山生态型水蓼活化/积累磷素机理研究

针对目前水体富营养化日趋严重以及土壤磷过剩等突出问题，本项目拟选择前期从磷矿区筛选出的磷富集矿山生态型水蓼为研究对象，以对应的非矿山生态型水蓼为对照，通过土培和水培试验相结合的方法，探索磷富集矿山生态型水蓼对磷的吸收、运输及富集作用，明晰根系形态及生理特性与磷富集的关系，阐明磷富集矿山生态型水蓼对磷的活化机制，弄清磷富集矿山生态型水蓼生理代谢特征，揭示磷富集矿山生态型水蓼积累磷的机理。这一研究有助于系统地阐明磷富集矿山生态型水蓼对磷的吸收、运输和累积本质以及对不同磷处理的应答，以期为修复磷过剩土壤和富营养化水体提供理论依据。

Eutrophication happens increasingly and seriously, and soil excess phosphorus (P) threats the water-body eutrophication potentially. Based on this situation, the mining ecotype (ME) Polygonum hydropiper collected in a P mine are chosen as the research object, compared with the non-mining ecotype (NME). Soil and hydroponic culture will be conducted in this study. The objectives are: (1) to assess the P assimilation, transportation and accumulation in the ME. (2) to estimate the relationship between root morphology and physiological characteristics with P uptake and evaluate the P activation mechanism of the ME (3) to understand the physiological characteristics and get the P uptake mechanism of the ME. Therefore, this study is contributing to evaluate the essence of P assimilation, transportation and accumulation systematically. It is also helpful to investigate the response of the ME for different P treatment, and further to provide the theory basis for P surplus soils and eutrophication water-body remediation.