In 1968, Napa County, California, created an agricultural preserve of 23,000 acres zoned for agriculture, wineries, and houses with a large minimum lot size of twenty acres. Over time, the agricultural preserve was expanded to 32,000 acres and the zoning tightened to a forty-acre minimum lot size. Concerns about nonfarm development and marketing activities at wineries compelled county voters to pass three referenda that limited population growth in the countryside and required a countywide vote for any zoning changes in the agricultural preserve. Thanks in part to the agricultural preserve, Napa County became America’s most famous wine-producing region.

中文翻译：

---

纳帕县农业保护区：五十年来作为美国首要葡萄酒产区的基础

1968年，加利福尼亚州纳帕县（Napa County）创建了23,000英亩的农业保护区，划为农业，酿酒厂和房屋的最小土地面积，最大面积为20英亩。随着时间的流逝，农业保护区扩大到32,000英亩，分区范围缩小到最小40英亩。对酿酒厂非农发展和市场营销活动的担忧迫使县选民通过了三项全民公决，这限制了农村人口的增长，并要求全县范围内对农业保护区的任何分区变更进行投票。在一定程度上得益于农业保护区，纳帕县成为美国最著名的葡萄酒产区。