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相关概念视频

Zones of Protection01:16

Zones of Protection

305
In power systems, the entire setup is divided into protective zones to isolate faults and protect the rest of the network. These zones include generators, transformers, buses, transmission lines, distribution lines, and motors. Each zone can be visualized as a separate room in a house, with each room protected by its own circuit breaker.
Protective zones are defined by closed dashed lines, containing one or more components. A key characteristic of these zones is the strategic placement of...
305
Habitat Fragmentation02:31

Habitat Fragmentation

17.8K
Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.
17.8K
Conservation of Declining Populations02:07

Conservation of Declining Populations

9.7K
Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
9.7K
Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device01:30

Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device

165
Surveyors use Global Positioning System (GPS) technology to measure the precise location and elevation of points on Earth. In a recent survey, GPS receivers were used to determine the coordinates and elevations of two park monuments. The process involved careful mission planning, data collection, and correction to ensure accuracy. The survey began with mission planning to identify optimal satellite visibility and minimize Position Dilution of Precision (PDOP). A geodetic control point...
165
Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

Design Example: Analyzing Capacity Contours for Flood Risk Assessment

94
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...
94
Defenses Against Pathogens and Herbivores02:26

Defenses Against Pathogens and Herbivores

24.2K
Plants present a rich source of nutrients for many organisms, making it a target for herbivores and infectious agents. Plants, though lacking a proper immune system, have developed an array of constitutive and inducible defenses to fend off these attacks.
24.2K

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相关实验视频

Updated: Sep 1, 2025

Methods of Soil Resampling to Monitor Changes in the Chemical Concentrations of Forest Soils
09:16

Methods of Soil Resampling to Monitor Changes in the Chemical Concentrations of Forest Soils

Published on: November 25, 2016

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保护森林的时间和地点

Ian H Luby1, Steve J Miller2, Stephen Polasky3,4

  • 1Department of Applied Economics, University of Minnesota, St Paul, MN, USA. lubyx023@umn.edu.

Nature
|August 17, 2022
PubMed
概括

战略保护计划可以保护全球生物多样性. 这项研究确定了在50年内保护植物物种的最佳生态区域序列,优先考虑高物种丧失风险和低成本的地区.

科学领域:

  • 生物多样性的保护
  • 保护科学
  • 生态学

背景情况:

  • 森林砍伐是全球生物多样性丧失的主要原因.
  • 有限的保护资源需要战略规划以有效保护物种.

研究的目的:

  • 在50年内确定全球458个森林生态区域中保护植物物种的最佳顺序.
  • 开发一个动态优化模型来优先考虑保护投资.

主要方法:

  • 采用了动态优化方法,包括物种丰富性,互补性,保护成本,现有保护,森林砍伐率和再造林潜力.
  • 在全球458个森林生态区域的50年时间内建模了保护战略.

主要成果:

  • 最佳策略最初针对高物种丧失风险和低保护成本的生态区域.
  • 保护工作随着时间的推移而扩大,包括更多的生态区域,专注于初级森林保护和再造林.
  • 预计美拉尼西亚,南亚和东南亚,亚纳托利亚半岛,南美洲北部和中美洲的物种保护将取得显著的收益.

结论:

  • 在保护植物物种方面,有针对性的投资带来了巨大的收益.
  • 动态优化为有效和有效的生物多样性保护策略提供了框架.

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  • 整合成本,风险和重新造林潜力等多个因素对于成功的保护计划至关重要.