关键词: 湿地生态系统健康, 时空尺度, 健康指标

Abstract: The accumulation of soil cadmium (Cd) and subcellular distribution in three Sorghum plants (Sorghum bicolor (L.) Moench. cv. Hunnigreen, Sorghum bicolor × S. sudanense cv. Everlush and Sorghum sudanense (Piper) Stapf cv. Xinjiang) were studied in this paper. The Cd content in the different parts of the three Sorghum species was positively correlated with the concentration of Cd. The Cd accumulated in the roots of the three Sorghum species was higher than in stems and leaves.The acumulate ability to Cd were as follows： S. bicolor×S. sudanense > S. sudanense > S. bicolor.The subcellular distribution of Cd in leaves, stems and roots of the three Sorghum species were as follows: cell wall > soluble part > cell nucleus, chloroplast components > mitochondria.

Key words: Wetland ecosystem health, Temporal-spatial scale, Health indicator