护田林带树种配置评价与优化模式选择

EVALUATION OF TREE SPECIES DEPASITIAN IN SHELTER BELT TO PROTEDT FARMLAND ANDITG GELECTION OF OPTIMIZED MODEL

本文应用技术经济学和多目标灰色局势决策的原理与方法,对江苏省丰县旱作农区护田林带的8种树种配置模式,从定量角度进行了评价和优化选择,结果表明:1)黄淮平原旱作农区,以“欧美杨树为主,泡桐镶边,杨树和刺槐混交”等树种配置模式,技术经济效果优于原存的泰山青杨树林带,优于种植农作物和多种林业项目。2)选出的树种配置优化模式,主林带是在林带两侧各栽植一行泡桐,中间杨树和刺槐株间混交,并以杨树为主要树种组成的窄林带;副林带是欧美杨树行道式林带。3)现存林带的生产要素投入,应继续增加物化劳动投入,减少活劳动投入,以提高技术经济效益;但以较高的活劳动代价来减少物化劳动消耗,在资金短缺和劳动力剩余的地区,仍有其现实意义。

With the theories and methods on technical economics and the grey stategy of multitarget, from the quantitative view, the evaluation and optimized model selection in 8 tree species deposition model for shelter belt in dry land cropping district, Fengxie, Jiangsu province, were carried out. The results are as follows: ① In dry laud district in Huang Huai plain, the deposition model in 7 tree species for sheoter belt used P x. euramericana as a principal tree species, mixed P x euramericana with a locust, and paulownia as its margin. Its technical economic benefits were better than that of shelter belt composed of populus xiaozuanica and planting crops and managing multiple-purpose for forestry. ② Optimized model selected in tree species deposition, its main forest belt was to plant a line of paulownia in each side, to mix a poplar with a locust in another plant in the midside. The narrow forest belt made of tree species regarded a poplar as main production purpose. The auxiliary forest belt was made up with a poplar in rapid growth, like a shade forest belt. ③ While the main productive factor was input in the existing forest belt, the district short of funds and the labor force in surplus, cutting down the consumption in the embodied labor with higher live labor value still has its practical significance.