江苏海岸带林农复合模式林分密度研究

Study on stand density of agroforestry models in the coastal zone of Jiangsu

对江苏海岸带 1～ 4年生 5种造林密度林农复合模式的综合经济效益进行了较系统地调查和评价。结果表明 :在造林后 1～ 2a内 ,林分密度对林农复合经营影响不明显 ,2a后 ,则成为制约林农复合经营综合经济效益的主导因子 ,在 5种密度林农复合模式中以农林比例 5∶1,株行距采用小株距、大行距 (4m× 12m )配置形式的综合经济效益最高 :会计收益率为 19 6 5% ,净现值为582 5 57元 /hm2 ,净现值指数为 1 712 ,林业和农业土地经济当量分别为 1 0 6和 1 45。

Complex effects of five different stand density of agroforestry models among 1～4 years were researched and evaluated in coastal zone of Jiangsu.The test results showed that the stand density didnt affect agroforestry management obviously in 1～2 years,but after two years,it was the main factor;complex effects of the agroforestry model was best,of which the proportion of tree and crop was 5∶1,apart in the row was 4 m,and spacing between rows was 12 m.Its financial income was 19 65%,net present value was 5 825 57 yuan/hm 2,the index of net present value was 1 712,the specific value of net total income and net tree income was 1 06,and it was 1 45 to net crop income.