Following the reduction of agricultural land, the level of land fragmentation is higher than before, which must affect the investment of peasant households as the investment subject of agricultural mechanization.

Family Life Cycle,Land Fragmentation and Peasant Household Agricultural Productive Input——Data from Laohekou City in Hubei Province;

Land fragmentation, however, may constitute a major bottleneck in increasing productivity and reducing poverty.

Under the guidance of absolute degradation thought, this paper proposes the technological frame for monitoring and appraising the cultivated land degradation, based on the 3S technologies,Namely using 3S technologies synthetically, analyzing the nature, environmental, social and economic elements which influence the land utilization and degradation synthetical.

Cultivated land change and farm household economic behavior response in gully region of loess hilly area;

Taking Chongqing as a case and using statistic data,the cultivated land change and its driving forces were analyzed using the principal component analysis in SPSS software.

Correlation analysis between cultivated land changes and economic development .

Changes of cultivated land in Hebei province from 1953 to 2004 were analyzed based on mathematics statistics method.

By analyzing the dynamic changes of cultivated land in Jiuquan City,it was found that the factors of influencing the cultivated land changes were the natural and economic factors.