An agricultural land is the base of agribusiness, and it is expected to be the most effective function in agriculture production, moreover, to act even the role as precious complementary goods of city park in an urban area recently.
This research purposes to measure the environmental preservation function of such productive green tract of land, or a city agricultural land, by the Contingent Valuation Method. Agricultural land regarded as the object of this research are four places of productive green tract land existing in a residential section inside the commuting area to Tokyo, that is, Hanamigawa-ku in the City of Chiba being one of typical densely populated districts.
Because the productive green tract of land is the public property peculiar to the area surrounding it, the benefits from it are mainly brought about to the peripheral residents. Then, making the peripheral residents of each productive geen tract the beneficiaries, a questionnaire survey was conducted in the area within 100 meters from it. The questionnaire forms were delivered to each benefit family by hand and collected in 2 or 3 days after delivery. The check list format was adopted to the questionnaire.
The mean WTP (Willingness To Pay) for maintaining and extending the productive green tract was estimated to be about ¥600_??_¥1, 200 per beneficiary, and the environmental benefits such as amenity benefit, a safety one for natural disasters and others brought by each productive green tract was done to be about ¥37, 000_??_¥102, 000. Also, it is confirmed the amount of environmental benefit given to the peripheral residents increases with progressing in the urbanization.
The agricultural land designated to the productive green tract is receiving a profitable taxation policy, in other words, it means the grant of a subsidy from a public division, that is, it is nothing but the social cost for environmental safeguard. Then, the environmental benefit, or a kind of social welfare, is evaluated quantitatively in comparison with the reduction and exemption amount of fixed property tax and inheritance tax, or a kind of social expense. The results of it demonstrated the latter exceeded the former on every productive green tract.

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