权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Element Recycling Activity during a Life Cycle of a Plant.

植物生命周期中的元素回收活动。

基本信息

批准号：
09680502
负责人：
NAKANISHI Tomoko
金额：
$ 0.64万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

Plant has been integrating the environmental nutritional change into its growth during the life-cycle. Therefore, the element kinetics in a plant is expected to provide a useful information for us to evaluate or protect the environment, from the point of element recycling system. The authors, first of all, had investigated how the elements are partitioned between soil and root, as well as root to the upper part of the plant in caatinger woods, which are the main wood species covering the semi-arid area in Brazil. Then the author analyzed the kinetics of element profile pattern during life-cycle of the plant, morning-glory. In every tissue of the plant, there has been each element gradient formed according to the life cycle and the pattern did not change during juvenile or adult phase of the growth. in the case of morning-glory, most of the transition elements were not transported to the developing seeds. Especially, Mn were accumulated to the old leaf during the growth and was, therefore, returned to the soil as a nutrient to grow the next generation. Most of Al, V and Na were not transported to the upper part of the plant, therefore, in the next generation, there still seems to remain a sufficient amount of these elements. Among the elements investigated, K seemed to be a restricting element to render the next generation grow. Potassium concentration in the leaf stem was always kept higher than that of the leaf, suggesting the regulation of a osmotic pressure of the leaf If additional K was not supplied to the soil, in three generations, K deficient soil might inhibit the plant growth. In the case of caatinger bush, divalent element, such as Ca or Mg tended to be used up in some species. Therefore, in the area investigated, the wood species, which does not uptake divalent element in a large amount should be selectively used to preserve the soil from the decrease of the plant nutrient.

植物在整个生命周期中一直将环境营养变化与其生长过程相结合。因此，从元素再循环系统的角度，研究植物体内元素的动力学，有望为我们评价或保护环境提供有用的信息。作者，首先，调查了元素如何分配之间的土壤和根，以及根到植物的上部caatinger森林，这是覆盖在巴西的半干旱地区的主要树种。然后分析了牵牛花生活史中元素剖面格局的动力学。在植物的各个组织中，存在着按生活史形成的各元素梯度，在生长的幼年期和成年期，这种模式没有改变。在牵牛花的情况下，大多数过渡元素没有被运送到发育中的种子。特别是，锰在生长过程中积累到老叶，因此，作为营养元素返回到土壤中生长的下一代。大部分Al、V和Na没有被运输到植物的上部，因此，在下一代中，似乎仍然保留了足够量的这些元素。在所研究的元素中，K似乎是一个限制下一代生长的元素。叶茎中的钾浓度始终高于叶片中的钾浓度，表明叶片的渗透压有一定的调节作用。如果不向土壤中补充钾，在3个世代中，缺钾土壤可能会抑制植株的生长。在刺槐林中，二价元素如Ca、Mg在某些物种中趋于消耗。因此，在调查地区，应选择不大量吸收二价元素的树种，以保护土壤免受植物养分减少的影响。