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水土保持投资效益测算是水土保持项目评估中的重要内容,但既有效益测算方法很难排除非水土保持因素的贡献,也难以测算系统的综合效益。运用Cobb—Douglas生产函数理论分析了水土保持投资对当地农业经济增长的贡献。结果表明,长汀县农业投资产出弹性最高,科技和制度创新贡献则较低。1999—2009年11a间,水土保持投资贡献了长汀县同期农业GDP的5.20%,产投比为5.9。随着农业物质资本投入的快速增长,水土保持投资对农业GDP的贡献逐年降低,这可能会抑制农户水土保持投资的积极性。
Estimation of investment in soil and water conservation is an important part of soil and water conservation project assessment. However, it is difficult to calculate the contribution of non-soil and water conservation factors to the existing benefit calculation method and to estimate the comprehensive benefits of the system. The contribution of soil and water conservation investment to the local agricultural economic growth is analyzed using Cobb-Douglas production function theory. The results show that the agricultural investment in Changting County has the highest elasticity and the contribution of science and technology and system innovation is lower. During the period of 1999-2009, investment in soil and water conservation contributed 5.20% of the agricultural GDP of Changting County in the same period, with a production-to-investment ratio of 5.9. With the rapid growth of investment in agricultural material and capital, the contribution of soil and water conservation investment to agricultural GDP has been decreasing year by year, which may inhibit the enthusiasm of farmers in soil and water conservation investment.