摘要
海南省位于我国热带地区，草本植物微量元素组成可反映热带区域生物地球化学特点。海南植物微量元素含量属正常范围值，仅个别植物Ｃｄ、Ｈｇ含量偏高。植物Ｚｎ、Ｃｕ、Ｍｏ含量大多在５ｍｇ／ｋｇ以上，Ｐｂ、Ｃｕ、Ｃｄ含量一般低于２ｍｇ／ｋｇ，Ｈｇ、Ａｓ、Ｎｉ通常不足１ｍｇ／ｋｇ。雀稗（Ｐａｓｐａｌｕｍｃｏｍｍｅｒｓｏｎｉ）、地胆草（Ｅｌｅｐｈａｎｔｏｐｕｓｓｃａｂｅｒ）等微量元素含量普遍较高。红裂稃草（Ｓｃｈｉｚａｃｈｙｒｉｕｍｓａｎｇｕｉｎｅｕｍ）、白茅（Ｉｍｐｅｒａｔａｃｙｌｉｎｄｒｉｃａ）等微量元素含量一般较低。植物微量元素组成与植物种类及其生境条件有关。生物吸收系数反映植物摄取元素的强度，Ｍｏ、Ｃｄ、Ｈｇ、Ｚｎ、Ｃｕ的生物吸收系数通常大于１．０，属强积聚元素，Ｐｂ、Ｃｒ、Ｎｉ、Ａｓ的生物吸收系数大多低于０．３，是弱摄取元素。
The average contents of trace elements Zn, Cu, Mo, Pb, Cd, Cr, Ni, As and Hg in some herbaceous plants in Hainan province are tested to be 40.49, 8.39, 7.16, 2.47, 1.24, 1.50, 0.85, 0.71 and 0.07 mg/kg, respectively, so we can find that their orders are Zn>Cu>Mo>Pb>Cr>Cd>Ni>As>Hg. The contents of trace elements in Paspalum commersonii and Elephantopus scaber are high, while the contents in Schizachyrium sanguineum and Imperata cylindrica are usually low. Mo, Hg, Cd, Cu, Zn are easy to transfer, their coefficients of absorption are usually higher than 1.0. Cr, Ni, Pb, As are hard to transfer,their coefficients of absorption are all mostly lower than 0.3. The contents of trace elements in herbaceous plants are affected by the species of the plant and the soil environment.
出处
《农村生态环境》
CSCD
1998年第4期24-28,共5页
Rural Eco-Environment
关键词
草本植物
微量元素
吸附系数
海南
生物监测
herbaceous plant, trace element, coefficient of absorption, Hainan province
