英文文献：Do Agricultural Preservation Programs Affect Farmland Conversion?
英文文献作者：Liu, Xiangping,Lynch, Lori
英文文献摘要：
More than 124 governmental entities concerned about suburban sprawl and farmland loss have implemented farmland preservation programs preserving 1.67 million acres at a cost of $3.723 billion. We ask how effective are these programs in slowing the rate of farmland loss. Using a unique 50-year 269 county panel data set on preservation programs and farmland loss for six Mid-Atlantic States, we employ the propensity score matching method to find strong empirical evidence that these programs have had a statistically significant effect on the rate of farmland loss. Preservation programs on average decrease the rate of farmland loss by 2.4 percentage points; a 33% decrease from the average 5-year rate of 7.31%.