Related Experiment Video
Updated: Jun 12, 2026
09:44
Use of Principal Components for Scaling Up Topographic Models to Map Soil Redistribution and Soil Organic Carbon
Published on: October 16, 2018
Exploring spatial change and gravity center movement for ecosystem services value using a spatially explicit
Yingbin He1, Youqi Chen, Huajun Tang
1Key Laboratory of Resources Remote Sensing and Digital Agriculture of Chinese Ministry of Agriculture/Hulunber Grassland Ecosystem Observation and Research Station, Institute of Agriculture Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Zhongguancun South Avenue 12#, Beijing, 100081, China. yingbin_he@yahoo.com.cn
Environmental Monitoring and Assessment
|June 18, 2010
Summary
Ecosystem services value in Beijing declined 19.75% from 1996-2006, with the center of gravity shifting northwest. Policy changes are needed to balance development and ecological protection.
Area of Science:
- Ecology
- Environmental Science
- Geospatial Analysis
Background:
- Spatially explicit ecosystem services valuation is an emerging research area.
- Understanding ecosystem service value changes is crucial for sustainable development.
Purpose of the Study:
- To develop a spatially explicit ecosystem services value index.
- To quantify and differentiate ecosystem services value changes in Beijing from 1996-2006.
Main Methods:
- Developed a spatially explicit ecosystem services value index.
- Utilized a gravity model to analyze spatial changes in ecosystem services value.
- Quantified changes at a 1-km grid resolution.
Main Results:
- Total ecosystem services value decreased by 19.75% between 1996 and 2006.
- The center of gravity for ecosystem services value shifted 32.28 km northwestward.
- Despite overall decline, 27.63% of the study area saw an increase in ecosystem services value.
Conclusions:
- Intensive human intervention in southeast Beijing impacted ecosystem services value.
- Policy-makers should prioritize ecological protection alongside socio-economic development.
- Increasing green belts in southeastern Beijing is recommended.
Related Concept Videos
01:05Gravimetry: Overview
Gravimetric analysis is a quantitative method where the analyte is isolated and weighed directly or after conversion into a substance of known composition. Gravimetric analysis can be classified as precipitation, electrogravimetry, volatilization, and particulate gravimetry, based on the method used to isolate the analyte.
In precipitation gravimetry, the analyte is converted into a precipitate and weighed. For example, the silver content in a sample can be estimated by precipitating and...
In precipitation gravimetry, the analyte is converted into a precipitate and weighed. For example, the silver content in a sample can be estimated by precipitating and...
01:29Levels of Use of a GIS
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...
01:03Finding the Center of Gravity
The center of gravity of a body is an imaginary point where the body's total weight is assumed to be concentrated, and the body is perfectly balanced. The center of the mass of a body is a point at which the whole of the mass of the body appears to be concentrated. If the acceleration due to gravity, g, has the same value at all points on a body, its center of gravity is identical to its center of mass. The center of gravity of homogeneous bodies such as a sphere, cube, or rectangular plate is...
01:04Work Done by Gravity
Gravitation is one of the four fundamental forces in nature. The force between objects on Earth and Earth itself is called gravity.
Like other forces, gravity does work on an object if it displaces it toward the Earth's center. In this case, the work done by gravity is said to be positive. If an external force acts on the object against the pull of gravity and manages to lift it away from the Earth's center, work is done against gravity. In this case, the net work done is said to be negative.
Like other forces, gravity does work on an object if it displaces it toward the Earth's center. In this case, the work done by gravity is said to be positive. If an external force acts on the object against the pull of gravity and manages to lift it away from the Earth's center, work is done against gravity. In this case, the net work done is said to be negative.
01:27Gravity between Spherical Bodies
Newton's law of gravitation describes the gravitational force between any two point masses. However, for extended spherical objects like the Earth, the Moon, and other planets, the law holds with an assumption that masses of spherical objects are concentrated at their respective centers.
This assumption can be proved easily by showing that the expression for gravitational potential energy between a hollow sphere of mass (M) and a point mass (m) is the same as it would be for a pair of extended...
This assumption can be proved easily by showing that the expression for gravitational potential energy between a hollow sphere of mass (M) and a point mass (m) is the same as it would be for a pair of extended...
01:20Variation in Acceleration due to Gravity near the Earth's Surface
An object's apparent weight is its weight measured by a spring balance at its location. It is different from its true weight, the force with which the Earth pulls it, because of the Earth's rotation. Mathematically, an object's apparent weight equals its true weight minus the centripetal force that keeps it in a circular motion along with the Earth's surface every 24 hours.
The difference between the true and apparent weights is proportional to the square of the Earth's angular speed. Since the...
The difference between the true and apparent weights is proportional to the square of the Earth's angular speed. Since the...