Advanced Materials Research Vols. 518-523

Abstract: With the rapid development of the economic and social in Yongchuan, the town construction land and rural residential land have a trend of rising in recent years, and land is the main constraint for the economic and social development, So it is the only way to solve the problem for rural residential land intensive use. In this paper, the land intensive use indicator system was constructed, and then the appraisal model was constructed to study on rural residential land intensive use in Yongchuan. The level of rural residential land intensive use was divided into four grades according to comprehensive score, the corresponding grades were intensive use, moderate use, low efficient use and extensive use, respectively.

Abstract: Using GIS and such models as dynamic degree, analyzed the land-use change in Qingdao according to the statistics of land-use data from 2000 to 2010 years and based on these, the author selects eight natural and socio-economic indexes, and takes districts as the study unit to calculate the driving force indexes with the fuzzy comprehensive evaluation method, and makes the spatial-division thematic maps of the driving forces which cause the land-use change in this region base on GIS. The results show that in Qingdao the land-use types which have the largest change rate is residential area and mining sites, followed by the unused land, water and cultivated land, and the garden plot is the smallest. There is a decreasing of cultivated land and unused land while other types have increased; because of a large base number, cultivated land reduces most among all land-use types. There exists a big spatial difference among these driving forces for land-use change. According the driving force indexes we divided them into four regions.

Abstract: Palaeopressures of the Jurassic formation in the hinterland of the Junggar Basin were reconstructed at different geological time with the method of fluid inclusion thermodynamic modeling. The results indicate that, the generation of overpressure in the east is earlier than that in the west. The overpressure center was first located in the east part of the Changji depression, and then migrated northwestward. The evolution of the formation pressure displays a trend of pressure decrease as a whole, and this trend is composed of three cycles of pressure down and up in block I and IV, but just one in block III and two in block II. Block III is a potential prospective area for hydrocarbon accumulation due to the long-term pressure releasing, and the last cycle which resulted in current formation pressure status in all of the four blocks suggests that the later gas charging had an obvious effect on the pressure accumulation.

Abstract: Aiming at promoting the rationalization of rural settlements clustering and protecting farming culture which is the core of rural characteristics, the current thesis analyzed the problems existing in village removal and merging, which, in a “Great Leap Forward” way, in the urbanization process, and points out the importance to maintain the characteristics of rural settlements, and proposed that the promotion of rural settlements should be base on full proof and scientific judgment, avoid artificially growth, and focus on the construction of clustering capacity. The idea not only enriches the system of the Integration of Urban-Rural, but also provides a realistic guidance for the merging villages at the current stage.

Abstract: Qingyang City is located in the central hilly area of Loess Plateau with arid climate and fragile ecological environment. From the ecological point of view, using related theories and methods on the ecological carrying capacity, this paper analyses the situation of the Scale structure of urban system of the study area, using the degree of ecological flexibility, carrying capacity and the degree of load pressure to evaluate the ecological carrying capacity briefly and discuss the relationship between ecological carrying capacity and urban scale structure. On this basis, this paper finally proposes some suggestions to adjust and optimize the Scale structure of urban system under fragile ecological conditions.

Abstract: The article analysis comprehensively the features of time change and spatial variation on each class of land use about Baolan-Lanqing-Qingzang urban belt, using EXCEL based on the data of land change from 1991 to 2009. It reveals the amplitude, velocity, regional difference and the distribution of spatial variation on principal class of land use in the study district. Meanwhile, we actually analysis the social economic factors by using factor analysis method in SPSS, which reflect population economy and urban industrial structure are the principal components to influence on the land use about Baolan-Lanqing-Qingzang urban belt.

Abstract: Since the middle of 1980s, urban land in our country has expanded rapidly. One of the important reasons is defects in the general plan for land use and the relevant system. This paper analyzes the defects in the general plans for land uses, the land requisition system, the assigning system and the collective construction land circulation in our country, and then includes an illustration that consummating the relevant land system is the key to govern urban land use.

Abstract: As a well-known city of oil in China, Daqing City is unique in natural conditions with variety of soils. Among them, a large part belongs to the saline—alkaline land, which reduces the ability of filed sound as well as causes diversity of eco-environment issues. In this paper, the existing technologies to reclaim the saline-alkaline land are summarized to analyze its application context. Finally combining with the nature research and natural status of saline-alkaline components in Daqing, the integrated various ways to improve the cultivated land are put forward.

Abstract: Since 1990s, urban land in China has increased rapidly, and the annual construction land quota of the city has been broken through constantly, so city size is always surmounting the scale limit of master plan. In order to understand and guide the healthy development of city scientifically, the paper investigates large amount of Chinese and western urban expansion phenomenon in the past centuries, and sums up 5 expansion patterns according to the driving forces. They are urban expansions driven by industrialization, by social psychology, by high concentration of urbanization, by impeded urbanization and national policy and by globalization, which are the main types of the urban expansion in modern society.

Abstract: The rapid urbanization in China has caused significant urban land use changes and extensive urban growth these years. That has led to a dramatic decrease in arable land and would challenge the national food security. To understand the anthropogenic driving forces of urban growth and find out effective control methods, this study established the Hierarchical Liner Model (HLM) to explore the influence of such factors including society and economy, population, and industry development. On the base of factor analysis and HLM, the decomposition of the affecting factors for urban growth was performed, it visually shows that the social retail goods, public transit passengers, and nonagricultural populations significantly drove the urban growth in China; the tertiary industry development has weak effects on urban growth. By weighting the role of the anthropogenic factors on urban growth, some advices were given at last, and it could provide possible management options for the government to mitigate the excessive urban growth in the near future.