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Liu, Xiaodan
- Influence of Fencing Time on Vegetation Community Structure and Species Diversity in Sandy Grassland of Ningxia in China
Abstract Views :105 |
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Authors
Affiliations
1 School of Soil and Water Conservation, Soil and Water Conservation Key Laboratory of Ministry of Education, Beijing Forestry University, Beijing, 100083, CN
1 School of Soil and Water Conservation, Soil and Water Conservation Key Laboratory of Ministry of Education, Beijing Forestry University, Beijing, 100083, CN
Source
Nature Environment and Pollution Technology, Vol 14, No 3 (2015), Pagination: 703-708Abstract
To investigate ecological restoration processes of sandy grassland, the areas of different fencing time (6, 11, 23 years) and non-fencing area were chosen in Yachi County of Ningxia Hui Autonomous Region. By quadrat method, the vegetation of the study region was investigated for the impacts of different fencing time on vegetation community structure and biodiversity. The type of dominant species in different areas were as follows: annual and biennial herbs (non-fencing area), semishrubs (6 years area), perennial herbs and semi-shrubs (11 years area) and perennial herbs (23 years area). The result showed that the values of vegetation coverage, density, biomass and height in fencing areas were higher than non-fencing area. In short-term period of less than 6 years, fencing increases biodiversity and makes community structure more stable, but long-term fencing of more than 11 years is not conducive to vegetation restoration. It suggested that rational uses of grassland such as grazing or cutting can be used in sandy grassland in semi-arid areas.Keywords
Fencing Time, Sandy Grassland, Community Structure, Species Diversity.Full Text
- Studies on Plant Community Complexity in Fenced Region of Ningxia, Northern China
Abstract Views :177 |
PDF Views:0
Authors
Affiliations
1 School of Soil and Water Conservation, Soil and Water Conservation Key Laboratory of Ministry of Education, Beijing Forestry University, Beijing 100083, CN
1 School of Soil and Water Conservation, Soil and Water Conservation Key Laboratory of Ministry of Education, Beijing Forestry University, Beijing 100083, CN
Source
Nature Environment and Pollution Technology, Vol 14, No 2 (2015), Pagination: 259-266Abstract
Biocomplexity theory is becoming increasingly important in understanding natural vegetation dynamics and interrelation among all components of ecosystems. A study was conducted under this concept in order to investigate the impacts of different fencing periods and measures on plant community complexity in desert grasslands of Yanchi County of Ningxia Hui Autonomous Region. The study was carried out by using a quadrat method and based on the average length of the Huffman code to describe total complexity L(S), Rényi entropy H(S) as disorder-based complexity, and the difference D (S) = L(S)-H(S) as structural complexity. The relationship was also studied between three kinds of complexity index and the number of species, Importance value of dominant species. The results showed that enclosure increases disorder-based complexity index and structural complexity index, which makes total complexity index to increase. Therefore, fencing is an effective measure for vegetation restoration and rehabilitation while long-term fencing is not conducive to vegetation restoration. In this study disorder-based complexity index is higher than structural complexity index, which means that disorder-based complexity index has great effects on total complexity index. The relationship between L(S ) and H(S) is very close whereas the correlation between H(S) and D(S) is negative. There is significant relationship between the number of species and the three kinds of complexity index. The importance value of dominant species is not significantly correlated with structural complexity, which has significant negative correlation with the other indices.Keywords
Fencing Period, Sandy Rangeland, Plant Community, Community Complexity, Semi-Arid Area.Full Text
- Study on the Characteristics of the Vegetation in the Fenced Region of Ningxia in China
Abstract Views :94 |
PDF Views:0
Authors
Affiliations
1 School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, CN
1 School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, CN
Source
Nature Environment and Pollution Technology, Vol 13, No 1 (2014), Pagination: 185-190Abstract
Fencing has been used as a main measure for rangeland and pasture rehabilitation all over the world. By quadrat method, the vegetation of Yanchi County of Ningxia Hui Autonomous Region has been investigated for the impacts of different fencing time on vegetation community structure and biomass. The result shows that it increases biodiversity and makes the vegetation community more stable. But long time fencing is not conducive to vegetation recovery. The Biodiversity Index in the edge areas and peripheral areas reached to highest level in the 4th and 5th year after fencing respectively. The Richness Index (R1) and Comprehensive Diversity Index (D, H) of the edge areas are 22, 2.26, 6.18, and those in the peripheral areas reach to 13, 1.67 and 3.24. Then biodiversity index decreased as fencing time increases. Under different fencing measures, the Biodiversity Index in the core area is the highest. So fencing is an effective measure for vegetation restoration. The vegetation coverage and biomass in the peripheral areas are the largest. This shows that rational uses of grassland are beneficial to vegetation recovery. Strip tillage doesn't have obvious effects on vegetation recovery, and it suggested that grazing or cutting can be used in this region for rangeland and pasture rehabilitation.Keywords
Fencing Time, Exclusion Measures, Biodiversity, Sandy Rangeland, Semi-Arid Area.Full Text
- Analysis of the Evolution Game of Stakeholders’ Behaviour in the Operation Stage of Green Buildings
Abstract Views :233 |
PDF Views:75
Authors
Xiaojun Liu
1,
Xiaodan Liu
1
Affiliations
1 School of Management Xi’an University of Architecture and Technology, Xi’an 710055, CN
1 School of Management Xi’an University of Architecture and Technology, Xi’an 710055, CN
Source
Current Science, Vol 117, No 5 (2019), Pagination: 821-829Abstract
This study aims to solve the problem of uncoordinated interests among the stakeholders in the operation stage (OS) of green buildings (GBs). First, the requirements and conflicts between the owners and property service enterprises (PSEs) are analysed. Secondly, the evolutionary game model of owners and PSEs is developed. It was found that the game system will evolve towards the ideal equilibrium stability strategy only under the following conditions: (i) the income of owners in green property management (GPM) is greater than the sum of the income of PSEs shared by the owner in GPM and the transaction costs generated when the owners choose to support GPM, and (ii) the sum of the income of PSEs shared by the owner in GPM and the additional benefits that PSEs can get by choosing GPM is greater than the total cost incurred by PSEs in choosing GPM. We carried out quantitative tests for equilibrium stability results and analysed the factor that influence the evolution path based on simulations performed in MATLAB. The results show that improving the operational income of GBs, increasing the additional income of PSEs, reducing the operating transaction costs and adopting a reasonable revenue sharing method are effective ways to coordinate the interests of all parties involved in the OS of GBs.Keywords
Evolutionary Game Theory, Green Buildings, Operation Stage, Stakeholders.Full Text
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