目的 通过监测在不同氮铬耦合浓度下，铬在泽泻不同部位的动态积累规律及其对泽泻生长的影响，探讨施氮量对在不同土壤铬背景值下泽泻生长的影响及其与铬积累的相关性。方法 对不同处理组采用动态监测法，测定不同生长时期泽泻不同部位的铬积累量及生物量的变化情况，同时利用统计学方法探讨铬积累量与氮肥施用量及土壤铬背景值的相关性。结果 铬对于泽泻生长的影响呈现出浓度依赖性及部位差异性。总体上低铬水平下泽泻的生长得到一定程度的促进，而高铬水平下泽泻的生长受到抑制。氮肥的施加能够缓解铬的生物毒性，使泽泻生长正常，但同时氮肥的施加也使泽泻对于铬的积累增加。偏相关分析的结果也表明氮的施用量与铬元素在泽泻块茎的积累呈正相关性。结论 泽泻规范化种植中应在保证其铬积累量不超标的情况下，尽量选择含低铬的土壤，同时氮肥的施用量应以泽泻药材安全性为前提。

Objective Through studying the chromium (Cr) accumulation in the various parts of Alisma orientale and the effect of Cr on the growth of A. orientale under nitrogen-chromium (N-Cr) coupling at different concentration. The effect of N-fertilizer application rates on the growth of A. orientale grown under the soil with different Cr background and the correlation between N-fertilizer and Cr accumulation were investigated. Methods Using dynamic observation and laboratory analysis to obtain the Cr accumulation amount and dry matter amount in various parts of A. orientale at different growth periods. The statistic method was used to explore the correlation between Cr accumulation and N-fertilizer application rates with the Cr background of soil. Results The effect of Cr on the growth of A. orientale was in a dose-dependent manner and differed in the various parts of A. orientale (tubers, roots, and leaves). Generally, soil with low Cr background could benefit the growth of A. orientale to some extent, while soil with high Cr background could inhibit the growth of A. orientale. But N-fertilizer application could alleviate the Cr biological toxicity and make the growth of A. orientale normally. On the other hand, the N-fertilizer application could make the Cr accumulation in A. orientale increase. Partial correlation analysis also showed that N-fertilizer application rate and Cr accumulation in tuber of A. orientale was positively correlated. Conclusion In the standardization of planting A. orientale, it is better to choose soil with low Cr content as the planting areas, while the safety of Chinese materia medica should be taken as the prerequisite to determine the N-fertilizer application.

公益性行业（农业）科研专项项目（200803028）