In recent years, with the economic development and the improvement of living standards in China, the energy consumption has been increasing significantly. To create a sustainable society, it is important to clarify the energy consumption and CO₂ emissions in the residential sector, especially that in the urban houses because China is in the process of urbanization.
 Studies on the residential energy consumption in China have been carried out in Japan as well as China. Yoshino et al.¹⁾ have made clear the energy consumption of apartment houses for six Chinese cities by surveying; Zhang et al.²⁾ clarified the energy consumption for the capital cities in China in 1997 using the official statistics, developing a model predicting energy consumption in the residential houses in China; Ning et al.³⁾ investigated the structure of energy consumption using the Chinese statistics; Yu et al.⁴⁾ clarified energy consumption by questionnaire surveying and simulations for six Chinese cities; Ling et al.⁵⁾ investigated the consumption of electricity and gas for 23 areas in Beijing and made clear the average energy consumption except energy for district heating. All these studies can be classified into two methods: statistical and survey methods. With the statistical method, researches often face the problem of lacking the items needed in their researches; but with the survey method, it is difficult to tell if the results can represent the reality. Because the statistical method is based on large number of residents, it is used in this study. All the studies mentioned above have not been able to make clear the trend of energy consumption in the urban houses, nor the CO₂ emissions caused by the energy consumption.
 In this study, based on Chinese statistics, unit energy consumption for 277 Chinese cities is clarified during the period of 2002-2012. The emissions of CO₂ caused by energy consumption per household are also analyzed. The main conclusions of this study are as follows:
 (1) Energy consumption per urban household increases from 12.3 GJ to 23.1GJ in the period of 2002 - 2012. The percentage of each kind of energy was clarified;
 (2) The emissions of CO₂ per urban household increases from 1, 689 kg CO₂ to 3,559 kg CO₂ in the period of 2002 - 2012. The weight of CO₂ emissions caused by different kinds of energy resources was made clear;
 (3) Energy consumption and CO₂ emissions per household in the capital cities is 1.44-fold and 1.42-fold of the average, respectively.

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本研究は、中国の 212都市を対象として、土地使用権の流動性と都市特性との関連性を明らかにした上で、地域の状況に応じた今後の土地利用管理政策についての方向性を提示することを目的としたものである。先ず、 1949年から現在までの中国の土地利用制度と土地管理政策を整理し、五つの時期に分け、各時期の特徴を明らかにする。次に、対象都市の都市経済指標と土地利用指標を用いて、主成分分析 /クラスター分析を行い、 7グループに類型し、各グループの経済発展レベルと都市化レベルの対応関係及び特徴を明らかにする。最後に、類型ごとの都市特性と土地使用権の転換状況の関係を比較分析・考察し、その結果に基づいて、類型ごとの今後の土地利用管理政策の方向性を提示している。

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Family management of agriculture by utilizing scattered farmland on a small scale is one of the main characteristics of modern agriculture in China. It is also normally considered as one important factor that hinders the increase of agricultural productivity. The Chinese government started to implement the Structural Adjustment of Agriculture in the year 1999. Under the Structural Adjustment of Agriculture, development of large scale agricultural management was facilitated by the government through policy support.

This study is based on an investigation and analysis of the cotton producing regions in Gaoyang County, Hebei Province. In particular, an analysis of the business evolution of L Farm Enterprise was made as an example of a pioneer in large scale cotton production in Gaoyang County. The purpose of this study is to clarify the process and trend of large scale agricultural management development under the Structural Adjustment of Agriculture. In addition, challenges facing the sustainable development of Chinese agriculture are also reviewed.

Under the Structural Adjustment of Agriculture, the government of Gaoyang County implemented a series of policies with the purpose of facilitating the development of large scale agricultural management and agricultural systematization. In these circumstances, a small number of farm households and organizations appeared that practice large scale agricultural management through tenanting. In parallel, the development of the cotton textile industry attracted a large amount of farm labor, which caused a reduction in the number of farm households doing labor intensive cotton production. As a result, a small number of large scale farm households and organizations replaced a number of small scale farm households and become the pillar of cotton production in Gaoyang County.

With the expansion of cotton production, farmland available for large scale cotton production was began to decline. In these circumstances, a small number of large scale farm households started to expand cotton production through tenanting in areas other than Gaoyang County, and kept only the high value added agricultural sector in Gaoyang County. Thus it is expected that the role of Gaoyang County in the Chinese domestic cotton supply system will change in the future.

Through investigation of L Farm Enterprise, it was discovered that various complicated problems are facing large scale agricultural management. L Farm Enterprise tried to avoid or overcome negative factors in order to maintain stable incomes. In parallel, it expanded the planted areas and applied a strategy aimed at the diversification of business. But when facing similar problems, most farm households don’t have enough capital to expand their farming area through tenanting and hiring labor, thus they are hardly able to realize large scale agricultural management.

Based on the above phenomena, the last part of this thesis analyzed the loss of farming labor and the centralization of farmland. It is an important way to promote the large scale agricultural management in order to realize the sustainable development of Chinese agriculture. In parallel, efforts should also be taken to create an environment that encourages stability and growth in earnings for small scale agricultural management.

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