江滩农林复合生态系统综合效益的评价

本文采用层次分析法，以芦苇和草滩作对照对江滩几种农林复合生态系统类型的经济效益、生态效益和社会效益进行了综合评价，通过分析得出的结论有：１．“兴林灭螺”类型中，无论是一年生人工林（指杨树、池杨、柳树等人工林），还是多年生人工林，无论间作与否，比芦苇、草滩都具有明显的综合效益。２．农林间作是提高滩地人工林综合效益的关键措施，有效间作的次数越多，其综合效益越好。３．随着林龄的增大，农林复合生态系统的综合效益逐步提高，宽行窄株稀植造林、适时疏伐以延长间作年限是提高综合效益的有效途径之一。４．江滩林木覆盖度与活螺框出现率呈正相关，仅靠自然生长的人工林，而不进行任何形式的间作或其他综合治理措施，不能完全解决灭螺的问题。

INTERGRATED EVALUATION OF THE EFFECTS OF AGROFORESTRY ECOSYSTEM ON THE RIVER BEACH

y means of the Analysis of Hierchy Process(AHP), this paper looked reeds and grassesas a paire of comparing plants to evaluate the intergrated effects of several agroforestry e-cosystems on the river beach. The main results were given as follows : 1. The agroforestry e-cosystem on the river beach had significant effect to grasses and reed,no matter whether theywere one year or perennial year artificial forest.2. Intercropping was a effective method toraise the effects of the artificial forest on the river beach. The more the intercropping times,the better the effects. 3. The intergrated effects of agroforestry ecosystem rose with the treeages. It was a effective way to raise the intergrated effects by enlarging row and narrowingspace between plants. 4. The forest coverage corelated positively with the rate of living snailsframe. Pure artificial forests without intercropping couldn't kill snails,so that it was neces-sary to apply the intercropping and intergrated prevention methods to control the damagingsnails.