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在高中《生物》(甲种本)的第46-47页,谈到了矿质元素的利用,这节内容的最后一句是:“有些元素(指N、P、K、Mg——作者注)在植物体内可以再利用,有些元素(指Ca、Fe——同上)则只能够利用一次。”矿质元素Ca、Fe在植物体内真的只能利用一次吗? 首先、从化学上来讲,我们知道,任何元素的化合物都是可溶于水的,只是有难易之别。同理,在植物体内,各种矿质元素都会有一部分溶解,溶解的这部分元素或者是呈游离状态存在于细胞液中,或者仅仅是吸附在原生质胶体的表面。矿质元素Ca、Fe也不例外,它们同样也有一部分(当然只是
The use of mineral elements is addressed in pages 46-47 of the Biology (A) in high school. The last sentence in this section reads: “Some elements (referring to N, P, K, Mg - Plants can be reused in the body, some of the elements (referring to Ca, Fe - ibid.) Can only be used once. ”The mineral elements Ca, Fe really can only be used once in the plant do? First of all, from a chemical point of view, The compounds of any element are water-soluble, except that they are hard to come by. Similarly, in plants, a variety of mineral elements will have a part of the dissolution of this part of the element is either free state exists in the cytosol, or just adsorbed on the protoplast surface. The mineral elements Ca, Fe are no exception, they also have a part (of course only