黄土高原植物中微量元素的分布状况

The Distribution of Trace Elements over the Plants on Loess Plateau

本研究1986～1987年通过对我国黄土高原所属的甘肃庆阳、宁夏盐池、西吉、陕西榆林等地共11个县境内的优势植物体内铁、锰、锌、铜、钴、钼、硒等微量元素的测定,其含量见表.结果表明.尽管这里生长的植物种类繁多,气候条件不同土壤类型不一,环境因素影响十分复杂,但是植物体内微量元素含量,有一定的分布范围,也反映出每种植物体内元素含量又各有差异.同时相关元素间又有一个比值关系.它不仅可以看出植物对元素吸收利用能力,还可以看出植物对元素的富集程度.因此,我们认为在自然环境条件下,发育形成的稳定植被类型,植物体内微量元素的含量,具有一定的稳定性,而且可以反映出当地环境的微量元素状况.当植物正常生长时体内元素含量范围,可以作为该地区植物元素背景值.

This paper presents the investigations within the counties of Qingyang,Gansu Province;Yanzhi,Ningxia District and Yulin,Shanxi province on the Loess Plateau from 1986 to 1987 with a view to examining the trace elements of Fe,Mn,Zn,Cu,Co,Mo, Se,etc.in those plants occurring there(see Table).The data have presented the trace elements contents with the plants in wide distribution with respect to different climatic condi- tions,soil types,various species of plants and complicated environments on the Loess Pla- teau.The results showed specific values between relative and separate trace elements.The re- lationship with regard to soil types and plants appears in itself not only in capacity to absorb trace elements,but also with plenty of collections.The authors considered under the native environmental conditions,the growth of vegetation types is stable.The contents of trace el- ements in plants are also stable,and show various differences of local environmental condi- tions when the plant growth is normal.The differences in contents of trace elements can be used to show the value of local plants which are occurred on the Loess Plateau for long times.