科研之友
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摘要
Different land-use managements accompany different land-use objectives in the changing phases of household economic development. These management changes lead to a number of changes in soil nutrients such as in soil organic matter (SOM). This article, with support from global positioning system (GPS) and geographic information system (GIS) monitoring, analyses and compares SOM change in an area of urban fringe in north China from 1982 to 2000 and then from 2000 to 2006. SOM increased by 27% (5.43 g kg(-1)-6.90 g kg(-1)) during the first period but decreased by 7% during the second. In the first period, with the implementation of the "Household Responsibility System", material inputs, especially of fertiliser was very high when the central household objective was to "have a full stomach". Yields also increased quickly, so there were corresponding increases in the amount of organic materials returned to the fields and SOM also increased during this earlier period. In the second period, household objectives developed making a trade-off between consumption and income above subsistence level. Land-use types evolved from subsistence field cropping to the growing of cash crops. Changing material inputs and managements between the different cropping systems affected soil nutrients such as SOM. SOM decreased in most of the region during this second period. Dynamic monitoring (GPS and GIS) is needed in the region to conduct scientific research on fertiliser use and management.
- 出版日期2007-12
- 单位中国农业大学
