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相关概念视频

Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

Design Example: Analyzing Capacity Contours for Flood Risk Assessment

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Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
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Levels of Use of a GIS01:29

Levels of Use of a GIS

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Geographic Information Systems (GIS) operate across three levels of application, each representing an increasing degree of complexity: data management, analysis, and prediction. These levels reflect the expanding functionality and versatility of GIS technology in handling spatial data for diverse purposes.Data ManagementAt its foundational level, GIS serves as a tool for data management, enabling the input, storage, retrieval, and organization of spatial data. This level is often employed in...
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Measurement: Derived Units03:02

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The International System of Units or SI system, by international agreement, has fixed measurement units for seven fundamental properties: length, mass, time, temperature, electric current, amount of substance, and luminosity. These are called the SI base units.
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Biodiversity and Human Values01:24

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Human civilization relies on biodiversity in many ways. Sudden changes in species biodiversity result in environmental changes that can modify weather patterns and therefore human civilizations.
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On many occasions, physicists, other scientists, and engineers need to make estimates of a particular quantity. These are sometimes referred to as guesstimates, order-of-magnitude approximations, back-of-the-envelope calculations, or Fermi calculations. The physicist Enrico Fermi was famous for his ability to estimate various kinds of data with surprising precision. Estimating does not mean guessing a number or a formula at random. Instead, estimation means using prior experience and sound...
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Measurement: Standard Units03:38

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Every measurement provides three kinds of information: the size or magnitude of the measurement (a number), a standard of comparison for the measurement (a unit), and an indication of the uncertainty of the measurement. While the number and unit are explicitly represented when a quantity is written, the uncertainty is an aspect of the errors in the measurement results.
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相关实验视频

Updated: May 23, 2025

A Low-Cost Method of Measuring the In Situ Primary Productivity of Periphyton Communities of Lentic Waters
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一种用于评估城市生态系统服务的新型单位价值方法.

Yunhua Lin1, Xudong Jia2, Donghoon Lee3

  • 1Department of Architectural and Planning, Hubei University of Technology, Wuhan, Hubei, China.

PloS one
|May 21, 2025
PubMed
概括

城市生态系统服务价值 (ESV) 由于森林和湿地增长而增加,但在城市中心下降. 人类活动对城市的ESV产生重大影响,突出了对可持续发展战略的需要.

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科学领域:

  • 城市生态城市生态学
  • 环境评价环境评价
  • 空间分析 空间分析

背景情况:

  • 快速的城市化导致复杂的土地利用变化,影响城市生态系统服务价值 (ESV).
  • 现有的估值方法往往忽视了人工生态系统对ESVs的贡献.
  • 了解ESV的时空动态对于可持续城市规划至关重要.

研究的目的:

  • 开发和应用一种新的单位值 (UV) 方法来进行全面的ESV评估,包括人工生态系统.
  • 分析1996年至2018年武汉ESVs的时空演变.
  • 调查影响城市ESV的驱动因素.

主要方法:

  • 开发一种包含自然和人工生态系统的单位值 (UV) 方法.
  • 武汉生态系统服务价值 (ESV) 的时空空间分析 (1996-2018).
  • 多重回归分析以确定ESV和驱动因素之间的Pearson的相关性.

主要成果:

  • 总体而言,ESV增加了20.94%,主要是由于森林和人造湿地扩张.
  • 在中部地区,ESV显示下降趋势,在郊区增加趋势.
  • 人类活动,包括农业,人均GDP和人口,被确定为城市ESV的关键驱动因素.

结论:

  • 新的紫外线方法为评估城市ESV提供了一个全面的方法.
  • 在城市中心和郊区之间存在ESV的显著空间不平衡.
  • 专注于人类活动的政策干预对于提高城市生态系统可持续性至关重要.