Coordinated interactions between economy and atmospheric environment: temporal–spatial comparisons from China

In order to evaluate the deterioration regularity for the mechanical properties of brick masonry due to acid rain corrosion, a series of mechanical property tests for mortars, bricks, shear prisms, and compressive prisms after acid rain corrosion were conducted. The apparent morphology and the compressive strength of the masonry materials (cement mortar, cement-lime mortar, cement-fly ash mortar, and brick), the shear behavior of the masonry, and the compression behavior of the masonry were analyzed. The resistance of acid rain corrosion for the cement-lime mortar prisms was the worst, and the incorporation of fly ash into the cement mortar did not improve the acid rain corrosion resistance. The effect of the acid rain corrosion damage on the mechanical properties for the brick was significant. With an increasing number of acid rain corrosion cycles, the compressive strength of the mortar prisms, and the shear and compressive strengths of the brick masonry first increased and then decreased. The peak stress first increased and then decreased whereas the peak strain gradually increased. The slope of the stress-strain curve for the compression prisms gradually decreased. Furthermore, a mathematical degradation model for the compressive strength of the masonry material (cement mortar, cement-lime mortar, cement-fly ash mortar, and brick), as well as the shear strength attenuation model and the compressive strength attenuation model of brick masonry after acid rain corrosion were proposed.

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Modelling analysis of chloride redistribution in sea-sand concrete exposed to atmospheric environment

Construction and Building Materials ◽

10.1016/j.conbuildmat.2020.121962 ◽

2021 ◽

Vol 274 ◽

pp. 121962

Author(s):

Wei Liu ◽

Yongqiang Li ◽

Luping Tang ◽

Feng Xing

Keyword(s):

Atmospheric Environment ◽

Sea Sand ◽

Modelling Analysis

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Analysis of the Internal Relationship between Ecological Value and Economic Value Based on the Forest Resources in China

Sustainability ◽

10.3390/su13126795 ◽

2021 ◽

Vol 13 (12) ◽

pp. 6795

Author(s):

Jianxin Geng ◽

Chengzhi Liang

Keyword(s):

Ecosystem Services ◽

Natural Resource ◽

Ecosystem Service ◽

Market Value ◽

Forest Resources ◽

Atmospheric Environment ◽

Shanxi Province ◽

Ecosystem Service Value ◽

Service Value ◽

Asset Value

In this study, we applied gross ecosystem product (GEP) theory in a case study to analyze and explain the natural resource asset value and ecosystem service value of forest resources in Jiaokou County, Shanxi Province, Northern China, in 2018. GEP refers to the total value of various final material products and services provided by ecosystems. In this paper, six service functions of a forest system, including water conservation, soil conservation, carbon fixation and oxygen release, forest nutrients, purification of atmospheric environment, and biodiversity, are valued by three calculation methods: the alternative cost method, market value method, and control cost method. The study revealed the following: (1) There is a parallel relationship between the value of natural resource assets and the value of ecosystem services. GEP includes the market value of natural resource assets, but it is mostly the value of ecosystem services. (2) The measurement of the physical quantity of forest ecosystem services depends on parameter data, and the monetary calculation often has no mature pricing basis, which leads to the large scale and uncertainty surrounding the evaluation results of ecosystem services. (3) The ecosystem service value and natural resource asset value have different practical significance, as well as alternate theoretical bases. The value of natural resource assets can be used as the asset valuation basis of economic transactions, which plays a role in macroeconomic management. The value of ecosystem services can be used as the basis of ecological compensation, providing information for the preparation of the balance sheet of natural resources.

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