Abstract
The spatial distribution of the cropping units in rural area, which related to the nitrogen inputs and intakes, is examined using remote sensing data. The spatial patterns of the amounts of both nitrogen input and intake through crop production on farmlands are obtained. As a result, it could be clarified that the amount of annual nitiogen inputs (by chemical fertilizer and compost) that range between 60kg·ha-1 and 325kg·ha-1, is unevenly distributed. In addition, the amount of annual nitrogen intakes by crops (by-products is excluded) that range between 11kg·ha-1 and 125kg·ha-1, is also unevenly distributed. This indicates that the spatial distribution pattern of nutrients input and intake through agricultural activities should be examined to study a watershed environmental control and a regional agricultural management. Thus, it is considered that those spatial distribution patterns are effective to examine regional material recycling system and material flow for watershed environmental management.
