自然资源学报 ›› 1996, Vol. 11 ›› Issue (4): 362-372.doi: 10.11849/zrzyxb.1996.04.010

• 论文 • 上一篇    下一篇

长江上游防护林体系不同林种的生态经济效益研究

雷孝章, 黄礼隆   

  1. 四川省林业科学研究院
  • 出版日期:1996-12-25 发布日期:1996-12-25
  • 基金资助:

    国家"七五"、"八五"攻关课题

A STUDY ON THE ECO-ECONOMIC BENEFITS OF DIFFERENT FOREST CATEGORIES OF THE SHELTER FOREST SYSTEM IN THE UPPER REACHES OF THE YANTSE RIVER

Lei Xiaozhang, Huang Lilong   

  1. Sichuan Forestry Academy
  • Online:1996-12-25 Published:1996-12-25

摘要: 通过对长江上游环境背景特征研究,探讨了防护林体系建立的重要性,并进行防护林体系配置,由此设置生态效益监测体系,以流域为单元,分层研究防护林体系的综合效益。研究表明:防护林体系配置后,坡面径流减少62%,径流含沙量减少69%,土壤肥力、土壤微生物活性均比荒坡高4~5倍;林地地温和气温均比农耕地低2~3℃,相对湿度提高30%~40%;流域的年地表径流减少,森林覆被率每增加1%,年地表径流减少4.1mm,年产沙量可减少5%~7%。生物措施可减少25%的泥沙,工程措施减少29%的泥沙。营建防护林后,经济效益明显:在中、低山区,林地直接经济效益净增值为921.5~992.4元/hm2·a,四川盆地净增值为850.3~1438.6元/hm2·a。

关键词: 长江上游, 防护林体系, 林种, 生态经济效益

Abstract: Through the study on the environmental background features of the upper reaches of the Yanzse River, this paper approaches the importance of the construction of a shelter forest system and researches the disposition of a shelter forest system. On this basics,setting up a monitoring system for the ecological benefits of a watershed is designed. The results of the investigation show that after the disposition of a shelter forest system, the run-off on slops decreased 62%, the silt content dwindles 69%, the soil fertility and the microbe activity of the forest land are 4─5 times higher than those of the waste land, the ground and air temperatures in the forest land are 2─3℃ lower than those in the agricultural field, and the relative humidity is 30%─40% higher. The annual surface runoff and silt production will decrease 4.1mm and 5%─7% respectively if the forest coverage adds 1%. Moreover,biological methods can decrease 25% of the silt amount and engineering methods can lower 29% of the silt amount. In addition, the economic benefits also are very conspicuous after the construction of a shelter forest system. The net increase is 921.5─992.4 yuan/hm2.a in the middle and low mountainous areas and it is 850.3─1438.6 yuan /hm2.a in the Sichuan basin.

Key words: the upper reaches of the Yantse River, shelter forest system, forest category, eco-economic benefit