Distribution of some mineral elements in grass tissues.

矿物质对反刍动物的效率因矿物质种类和饲料种类的不同而不同。造成这种差异的一个可能因素是植物组织中矿物质的分布模式。本试验对鸭茅、高羊茅和多年生黑麦草不同组织中大量矿物质的分布进行了研究。为此，采用能量色散X射线分析方法测定了植物组织中大量矿物的分布模式，在每个单元中，硅和钾(K)是最主要的元素，其次是氯(CL)、钙(Ca)、硫和磷，还检测到了少量的镁。硅主要存在于表皮结构中。虽然其他矿物质普遍分布在整个断面上，但在发达的次生细胞壁中钙含量丰富，尤其是K和Cl在维管组织中含量较高，硅石主要分布在表皮结构中。在发达的次生细胞壁上可观察到钙的亮点。钾、氯、磷和镁的分布覆盖了每个横断面的整个表面积。钾和氯在维管组织中含量较高。钙的低效率部分是由分布格局造成的，在发达的次生细胞壁中大量存在。而其他矿物的分布关系不明显。

The efficiency of minerals for ruminants differs according to the kind of minerals and forage species. A possible factor causing this difference is the distribution pattern of minerals in plant tissues. This experiment is to investigate the distribution of macrominerals in different tissues of orchardgrass, tall fescue and perennial ryegrass. For this purpose, energy-dispersive X-ray analysis was used to determine distributional patterns of macrominerals in plant tissues.In each unit, silicon and potassium (K) were the most predominant elements, followed by chlorine (CL), calcium (Ca), sulfur and phosphorus; a small amount of magnesium was also detected. Silicon existed mostly in epidermal structures. Although the other minerals were distributed generally throughout the sectional area, Ca was abundant at the developed secondary cell walls, and K and Cl were especially higher in vascular tissues.Silica distributed mostly in epidermal structures. Bright spots of calcium were observed especially at developed secondary cell walls. Distributions of K, Cl, P and Mg covered the entire surface area of each cross section. Potassium and Cl were especially higher in vascular tissues. The low efficiency of Ca is partially caused by the distributional pattern, and was abundant at developed secondary cell walls. However, no distributional relationship was observed for the other minerals.