Spatial and Temporal Differences of Urban Land Comprehensive Carrying Capacity in Guangxi

The comprehensive carrying capacity of urban land can reflect the re- source level, economic scale, social development and environmental pressure of ur- ban land carrying. The assessment indicator system of urban land comprehensive carrying capacity was constructed from the 4 aspects of resource, economy, society, environment, and principal component analysis and cluster analysis were used to evaluate the urban land comprehensive carrying capacity of Guangxi and the 14 cities in 2005-2014, and analyzed its spatial and temporal characteristics as well as the driving forces, with the aim to provide references for improving the urban land comprehensive carrying capacity. The results showed that, the overall urban land comprehensive carrying capacity in Guangxi increased in 2005-2014, and there were significant differences in the land comprehensive carrying capacities among the cities in Guangxi in 2005-2014, in which Liuzhou, Guilin, Nanning belonged to the regions with the highest carrying capacity, while Beihai, Yulin, Wutong belonged to the regions with high carrying capacity, and the carrying capacities of the other cities changed with the changes of time. The economic development degree was an important factor influencing urban land comprehensive carrying capacity, but could not directly represent the urban land comprehensive carrying capacity level.

Assessment of Land Comprehensive Carrying Capacity in Lin'an City

According to regional characteristics and the actual situation in Lin ’an City, an evaluation index system of land comprehensive carrying capacity composed of three support subsystems （eco-environment, social and economic carrying capaci-ties） containing 22 evaluation indexes was established to evaluate the comprehen-sive carrying capacity of land resource in Lin’an City during 2005-2012. Meanwhile, based on the target data of overal land use plan, the level of land comprehensive carrying capacity was predicted at the end of the plan period （2020） .The results showed that land comprehensive carrying capacity had a significant growth in Lin ’an from 2005 to 2012, and the development trend was basical y sustainable. The sub-systems also had been greatly improved, in which the constant improvement of ec-ological environment carrying capacity made the largest contribution to the constant raising of land comprehensive carrying capacity. The degree of coordination between the systems was poor, in which eco-environment carrying capacity had the maxi-mum growth, far more than the social and economic carrying capacities. According to the land comprehensive carrying capacity in 2020, utilization of land resources in Lin＆#39;an city can achieve sustainable development in general. Final y, proposals of im-proving comprehensive carrying capacity were put forward in terms of the enhance-ment of eco-environment protection, accelerating economic development and policy guidance.

Research on Land Resource Carrying Capacity:Progress and Prospects

As an important part of resource and environment carrying capacity（RECC）,land resource carrying capacity（LRCC） has focused on the limiting factors on regional development from the scale of land resources for more than two hundred years.After a brief review of the origin and early development of LRCC,the progress of LRCC is summarized as a progression from land resource population carrying capacity（LPCC） to land resource comprehensive carrying capacity（LCCC）,and the hot issues of LRCC have changed from the simple human–grain relationship to more complex social and economic activities–land resources relationships.The corresponding research methods also evolved,from static research to dynamic research,and the assessment factor have evolved from a single factor to a comprehensive index system.Agro-ecological zoning（AEZ）,system dynamics（SD）,ecological footprint（EF）,and comprehensive evaluation methods have come to be viewed as the most representative methods of LRCC in recent years.As a focus of conventional LRCC research,the human–grain relationship still plays a significant role in LRCC evaluation because grain remains the top limiting factor of land resources and is the most significant criterion in the balance between regional population and land resources,especially for very populous countries.More attention should be paid to the accurate calculation of arable land and average food consumption levels to improve the scientific basis of LRCC evaluation.The development of science and technology and the variation of lifestyle are also important factors that influence regional LRCC.As a new topic of LRCC,LCCC has expanded the research field of LRCC in an attempt to reveal the limiting effects of land resource under open systems,but some issues such as carrying mechanism research and the combination of theoretical and applied research are needed in future studies to promote the further development of LCCC.