fixation of atmospheric nitrogen

简明释义

大气氮素固定

英英释义

例句

1.Certain bacteria play a crucial role in the fixation of atmospheric nitrogen in the soil.

某些细菌在土壤中大气氮的固定中发挥着关键作用。

2.Understanding the fixation of atmospheric nitrogen can help improve soil fertility.

理解大气氮的固定可以帮助改善土壤肥力。

3.The process of fixation of atmospheric nitrogen is essential for the growth of plants.

大气氮的固定过程对植物的生长至关重要。

4.Farmers often use legumes to enhance the fixation of atmospheric nitrogen in their fields.

农民常常使用豆科植物来增强他们田地中的大气氮固定。

5.The fixation of atmospheric nitrogen is a natural process that supports ecosystems.

大气氮的固定是支持生态系统的自然过程。

作文

The process of fixation of atmospheric nitrogen is crucial for the sustenance of life on Earth. Nitrogen, which makes up about 78% of the Earth's atmosphere, is an essential element for all living organisms. However, most organisms cannot utilize atmospheric nitrogen directly. This is where the fixation of atmospheric nitrogen comes into play. It refers to the conversion of nitrogen gas (N2) from the atmosphere into ammonia (NH3) or related compounds that can be absorbed by plants. This process is primarily carried out by certain bacteria and archaea, known as nitrogen-fixing microorganisms.There are two main types of nitrogen fixation: biological and abiotic. Biological nitrogen fixation occurs in the root nodules of leguminous plants, where symbiotic bacteria such as Rhizobium convert atmospheric nitrogen into a form that plants can use. This relationship is mutually beneficial; the plants provide carbohydrates to the bacteria, while the bacteria supply the plants with usable nitrogen. On the other hand, abiotic nitrogen fixation can occur through natural processes such as lightning or human activities like industrial synthesis, where nitrogen is converted into fertilizers.The significance of the fixation of atmospheric nitrogen cannot be overstated. Without this process, ecosystems would struggle to thrive. Plants require nitrogen for the synthesis of amino acids, proteins, and nucleic acids. Consequently, when nitrogen is made available to plants through fixation, it supports the growth of crops and contributes to food security. In agricultural systems, understanding and enhancing the fixation of atmospheric nitrogen can lead to sustainable farming practices. For instance, crop rotation with legumes can naturally enrich the soil with nitrogen, reducing the need for synthetic fertilizers.Moreover, the fixation of atmospheric nitrogen plays a vital role in the nitrogen cycle, which is essential for maintaining ecological balance. The nitrogen cycle involves several steps: nitrogen fixation, nitrification, assimilation, ammonification, and denitrification. Each of these processes contributes to the movement of nitrogen through the environment, ensuring that it remains available for living organisms.Despite its importance, the fixation of atmospheric nitrogen faces challenges. Human activities, such as excessive use of nitrogen fertilizers, can lead to environmental issues like water pollution and biodiversity loss. The runoff from agricultural lands can cause eutrophication in water bodies, leading to algal blooms that deplete oxygen and harm aquatic life. Therefore, it is crucial to manage nitrogen use effectively to preserve ecosystems.In conclusion, the fixation of atmospheric nitrogen is a fundamental process that supports life on Earth. By converting inert nitrogen gas into forms usable by living organisms, it enables plant growth and sustains ecosystems. As we face global challenges such as food security and environmental degradation, understanding and optimizing the fixation of atmospheric nitrogen will be key to developing sustainable agricultural practices and protecting our planet's health.

大气氮的固定过程对地球上生命的维持至关重要。氮气约占地球大气的78%，是所有生物体必需的元素。然而，大多数生物无法直接利用大气中的氮。这就是大气氮的固定发挥作用的地方。它指的是将大气中的氮气（N2）转化为氨（NH3）或相关化合物的过程，这些化合物可以被植物吸收。这个过程主要由一些细菌和古菌，即氮固定微生物来完成。氮固定主要有两种类型：生物氮固定和非生物氮固定。生物氮固定发生在豆科植物的根瘤中，那里共生细菌如根瘤菌将大气氮转化为植物可以利用的形式。这种关系是互利的；植物为细菌提供碳水化合物，而细菌则为植物提供可用的氮。另一方面，非生物氮固定可以通过自然过程如闪电或人类活动（如工业合成）发生，在这些过程中，氮被转化为肥料。大气氮的固定的重要性不容小觑。如果没有这个过程，生态系统将难以繁荣。植物需要氮来合成氨基酸、蛋白质和核酸。因此，当通过固定使氮对植物可用时，它支持作物的生长并有助于粮食安全。在农业系统中，理解和增强大气氮的固定可以导致可持续的农业实践。例如，与豆科植物轮作可以自然丰富土壤中的氮，减少对合成肥料的需求。此外，大气氮的固定在氮循环中发挥着至关重要的作用，氮循环对于维持生态平衡至关重要。氮循环涉及几个步骤：氮固定、硝化、同化、氨化和反硝化。每个过程都有助于氮在环境中的移动，确保其对生物体的可用性。尽管其重要性，但大气氮的固定面临挑战。人类活动，如过度使用氮肥，可能导致环境问题，如水污染和生物多样性丧失。农业用地的径流可能导致水体的富营养化，导致藻类大量繁殖，耗尽氧气，危害水生生物。因此，有效管理氮的使用对于保护生态系统至关重要。总之，大气氮的固定是一个支持地球生命的基本过程。通过将惰性氮气转化为生物体可用的形式，它使植物生长得以实现，维持生态系统。随着我们面临全球粮食安全和环境退化等挑战，理解和优化大气氮的固定将是发展可持续农业实践和保护地球健康的关键。