xylem

简明释义

英[ˈzaɪləm]美[ˈzaɪləm]

n. [植] 木质部

英英释义

单词用法

同义词

反义词

例句

1.Summertime bud grafting can be cut take shoot piece, or take xylem shoot less piece, in stock bine dry place decorticates.

夏季芽接可削取芽片，或少带木质部芽片，在砧木茎干处剥皮。

2.The secondary xylem of the original plants in local acidic environment was replaced by silica and turned into fossil woods.

处在酸性垒的原植物次生木质部组织被二氧化硅替换而成硅化木。

3.The harmful effect of injecting chemical into tree on the xylem, bast, periderm and tree body was studied.

本文就树干注入农药，对木质部、韧皮部及周皮和整个树体是否产生不良影响做出评价。

4.The positive xylem pressure, often occurs with low transpiration rate, is termed as root pressure.

在植物弱蒸腾情况下，木质部的水分处于正压状态，这种压力叫根压。

5.The discovery of nuclei existing in mature xylem cells is a new one in Wood Anatomy.

在成熟木材细胞中发现细胞核是木材解剖学的新发现。

6.A system confined to the transport of mineral elements is known as the xylem.

专门用来运输矿物元素的系统称为木质部。

7.The vascular bundle consists of vascular bundle sheath, xylem, phloem and big parenchymatous cells.

维管束由维管束鞘、木质部、韧皮部和大型薄壁细胞组成。

8.The secondary xylem of the original plants in local acidic environment was replaced by silica and turned into fossil woods.

处在酸性垒的原植物次生木质部组织被二氧化硅替换而成硅化木。

9.It is an important pathway for movement of these substances outside the xylem, for example across the root cortex.

质外体是木质部外方物质运动的一个重要途径，例如物质穿过根冠。

10.The plant's xylem transports water from the roots to the leaves.

植物的xylem（木质部）将水从根部输送到叶子。

11.Researchers studied how the xylem affects tree growth in different climates.

研究人员研究了xylem（木质部）如何影响不同气候下树木的生长。

12.In some plants, the xylem can also store nutrients.

在某些植物中，xylem（木质部）也可以储存养分。

13.The structure of the xylem is crucial for its function in water transport.

木质部的结构对其在水分运输中的功能至关重要。

14.During drought, the xylem may become damaged, affecting the plant's health.

在干旱期间，xylem（木质部）可能会受到损害，从而影响植物的健康。

作文

The fascinating world of plants is filled with intricate systems that allow them to thrive in diverse environments. One of the most crucial components of a plant's anatomy is the structure known as xylem. The xylem is a type of tissue responsible for the transportation of water and dissolved minerals from the roots to the rest of the plant. This process is vital for maintaining the plant's health and overall function. Without the xylem, plants would struggle to obtain the necessary resources to survive. The xylem consists of various cell types, including tracheids and vessel elements, which work together to facilitate the movement of water. Tracheids are long, narrow cells that help in the conduction of water, while vessel elements are wider and allow for more efficient transport. The arrangement and structure of these cells are specifically designed to withstand the pressure generated during water movement, ensuring that the plant can effectively distribute essential nutrients. In addition to its role in water transport, the xylem also provides structural support to the plant. The lignin present in the cell walls of xylem cells adds rigidity, allowing plants to grow tall and resist external forces such as wind. This dual function of the xylem—transportation and support—highlights its importance in the life of a plant. Interestingly, the xylem is not just a passive conduit for water. It plays an active role in regulating water flow through a process called transpiration. As water evaporates from the leaves, it creates a negative pressure that pulls more water up from the roots through the xylem. This mechanism is essential for nutrient uptake and helps maintain the plant's temperature by facilitating cooling through evaporation. Moreover, the study of xylem has significant implications for understanding plant physiology and ecology. Researchers examine the characteristics of xylem in various species to determine how they adapt to their environments. For instance, plants in arid regions have evolved specialized xylem structures that minimize water loss and maximize efficiency. Understanding these adaptations can inform conservation efforts and agricultural practices, particularly in the face of climate change. In conclusion, the xylem is an essential component of plant biology, playing a critical role in water transport, structural support, and overall plant health. By studying the xylem, we gain valuable insights into how plants interact with their environment and adapt to challenges. As we continue to explore the complexities of plant systems, the significance of the xylem will undoubtedly remain a focal point in botanical research and education.

植物的迷人世界充满了复杂的系统，使它们能够在多样的环境中繁荣生长。其中一个至关重要的组成部分是被称为xylem的结构。xylem是一种组织，负责将水和溶解的矿物质从根部运输到植物的其他部分。这个过程对维持植物的健康和整体功能至关重要。如果没有xylem，植物将难以获取生存所需的资源。 xylem由多种细胞类型组成，包括导管和导管元素，这些细胞共同作用以促进水的移动。导管是长而狭窄的细胞，帮助水的导流，而导管元素则较宽，可以更有效地运输。 这些细胞的排列和结构专门设计用于承受在水流动过程中产生的压力，确保植物能够有效分配基本营养。 除了在水运输中的作用外，xylem还为植物提供结构支持。存在于xylem细胞壁中的木质素增加了刚性，使植物能够长高并抵御诸如风等外部力量。xylem的这种双重功能——运输和支持——突显了其在植物生命中的重要性。 有趣的是，xylem不仅仅是水的被动导管。它通过一种叫做蒸腾作用的过程积极调节水流。当水从叶子中蒸发时，会产生负压，拉动更多的水通过xylem从根部向上。这一机制对养分吸收至关重要，并通过促进蒸发来帮助维持植物的温度。 此外，对xylem的研究对理解植物生理和生态具有重要意义。研究人员考察各种物种中xylem的特征，以确定它们如何适应环境。例如，生长在干旱地区的植物已经进化出特殊的xylem结构，以最小化水分损失并最大化效率。了解这些适应性可以为保护工作和农业实践提供信息，特别是在气候变化面前。 总之，xylem是植物生物学的重要组成部分，在水运输、结构支持和整体植物健康方面发挥着关键作用。通过研究xylem，我们获得了关于植物如何与环境相互作用和适应挑战的宝贵见解。随着我们继续探索植物系统的复杂性，xylem的重要性无疑将继续成为植物研究和教育的重点。