基于C-D函数的长汀县水土保持投资贡献测算

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.

Soil and Water Conservation Investment Contributions in Changting County Calculated Based on C-D Function

Calculating the investment benefits of soil and water conservation(SWC)is an important part in SWC project evaluation.Using the existing methods of benefit calculation,however,is difficult in eliminating the contributions of other factors except SWC and estimating the comprehensive benefits of system.By taking Changting County for an example,an analysis on the contributions of SWC investment to local agricultural economy was made based on the Cobb-Douglas production function theory.Results reveal that the contribution of agricultural investment was highest in the features of output,butlower in technology and system innovation.From 1999to 2009,5.20% of agricul tural GDP were derived from SWC investment and the ratio of output to input was 5.9in Changting County.With the rapid growth of physical capital investment in agriculture,the contributions of SWC investment to agricultural GDP were being reduced year after year,which may restrain farmers'investment enthusiasm for SWC.