相关实验视频

Updated: Jun 10, 2025

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

Published on: July 22, 2019

被困的城市:人类循环中的一个被忽视和无法获得的库存

Xuanjing Chen^1,2, Ning Cao³, Carolien Kroeze²

¹Interdisciplinary Research Center for Agriculture Green Development in Yangtze River Basin, College of Resources and Environment, Southwest University, Chongqing 400715, China.

Environmental science & technology

|October 14, 2024

概括

城市化在中国捕获了大量的 (P),从1992年到2019年共计13Tg. 这种被困的P,主要来自固体废物和丢失的农田,突显了P回收和土地保护的必要性.

科学领域:

环境科学环境科学
地质化学地质化学
城市生态城市生态学

背景情况:

城市地区是 (P) 的主要消费者,导致大量含有P的废物.
城市化可以通过土地转型和废物管理实践无意中陷入P的陷.
被困在城市中的P代表了一个重要的,但经常被忽视的,难以接近的储库.

研究的目的:

量化城市化对中国被困 (P) 的贡献.
分析城市化导致P陷的途径.
评估被困的城市P对更广泛的循环的影响.

主要方法:

在城市固体废物中产生和积累P的分析.
与耕地转化为城市地区相关的P损失的量化.
在中国,从1992年到2019年,对被困P的时间和空间评估.

主要成果:

中国在1992-2019年间产生了大约13 (±0.9) Tg的城市被困P.
在研究期间,被困的城市P占P总消费量的6%,化学肥料P使用量的9%.
耕地损失占被困P的15%,而城市固体废物处置占剩余的85%.

结论:

城市化在很大程度上导致被困,主要是通过固体废物和土地损失.
有效的废物管理,包括分类和回收,对于P的回收至关重要.
保护肥沃的耕地对于减轻城市化地区的损失至关重要.

关键词:

植物生产植物生产遗留的是一种传统.回收回收是回收的过程.城市扩张城市扩张.废物处理处置的废物处理方式

更多相关视频

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

Published on: March 6, 2014

Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method

Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method

Published on: May 18, 2018

相关概念视频

The Phosphorus Cycle

The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.

Metabolism of Chemolithotrophs

Metabolism of Chemolithotrophs

Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.

What are Biogeochemical Cycles?

What are Biogeochemical Cycles?

The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.

Primary Production

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.

The Carbon Cycle

The Carbon Cycle

Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.

The Sulfur Cycle

The Sulfur Cycle

Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the atmosphere as sulfur dioxide (SO2), sulfur is released by decaying organisms, weathered rocks, geothermal vents, volcanos, and burning fossil fuels. It is deposited into the ecosystem, cycled through the biotic community, and either released back into the atmosphere as gas or deposited in marine sediment for long-term storage and eventual...