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林业科学 ›› 2005, Vol. 41 ›› Issue (2): 191-194.doi: 10.11707/j.1001-7488.20050234

• 研究简报 • 上一篇    下一篇

坡耕地退耕还林后的植被恢复

万雪琴 胡庭兴 张健 李贤伟 宫渊波   

  1. 四川农业大学生态林业工程省级重点实验室,雅安625014
  • 收稿日期:2003-06-17 修回日期:1900-01-01 出版日期:2005-03-25 发布日期:2005-03-25

Vegetation Restoration of Hillside Fields after Conversion of Farmland to Forests

Wan Xueqin,Hu Tingxing,Zhang Jian,Li Xianwei,Gong Yuanbo   

  1. The Provincial Key Laboratory of Ecological Forestry Engineering, Sichuan Agricultural University Ya'an 625014
  • Received:2003-06-17 Revised:1900-01-01 Online:2005-03-25 Published:2005-03-25

关键词: 坡耕地, 退耕还林, 植被恢复, 生活型, 生物多样性, 群落发展

Abstract:

Public welfare forest is the most important model of vegetation restoration in the Conversion of farmland to forests in Sichuan Province. It can well represent and reflect the characteristics and laws of vegetation restoration in hillside fields. Therefore an Alnus cremastogyne forest community developed via converting hillside fields to forest, was investigated by contrast with a weed community on abandoned hillside fields. The results indicated that: 1) In Sichuan Basin and surrounding regions of it, vegetations restored so rapid that the average DBH (diameter at breast height), tree height of A.cremastogyne tree crown density, ground vegetation coverage respectively reached 5.2 cm, 6.1 m, 0.7 and 100 percent for 3 years and after converting hillside fields to forest. 2) With vegetation restoring, community gradually developed mosaic spatial pattern and vertical stratification, simultaneously distribution of plant population changed from regular to clumped, and spatial heterogeneity of community increased. 3) Community biodiversity remarkably increased in the process of vegetation restoration in hillside fields. During the period, species richness of both commnuities changed from 20 to 39, Shannon-Wiener diversity index was 4.205 and 5.021 respectively, while Pielou equitability index dropped little. 4) Plant species frequently and dramatically altered, which mainly showed that therophytes declined rapidly from 16 to 10, while perennial ones dramatically increased from 2 to 26, and 8 of them are phanerophytes. 5) The pathway of community development approximately was from annual herbs to shrubs + perennial herbs to trees + shrubs and herbs + perennial herbs, finally to natural mixed forests, such driving force was mainly from interspecific competition.

Key words: hillside fields, conversion of farmland to forests, vegetation restoration, life form, biodiversity, community development