退耕还林工程影响着土地利用和土地覆盖的变化,进而引起山地农业生态系统和自然生态系统空间格局的变化。植物功能性状反映了植物自身对所处生长环境的适应及响应,是植物与环境相互作用的结果。本研究选取滇西北维西县土壤条件一致、地形地貌条件相近、不同退耕年限(3年和9年)的2块样地,以植物群落方法为基础,调查不同退耕年限撂荒地与云南松交错地带中植物比叶面积( Specific leaf area, SLA),探讨生态交错带中植物的生长情况及其生态系统的稳定性,判定不同退耕年限生态交错带的位置和宽度。结果表明,(1)平均SLA：生态交错带>撂荒地>云南松林；(2)退耕3年撂荒地样带中的植物平均SLA (12．05)>12,退耕9年撂荒地样带中的植物平均SLA>9．09,表明共存的植物其叶片性状特征对环境异质性具有不同的响应,植物为适应不同的生境,其SLA发生了相应的变化；(3)退耕3年撂荒地生态交错带的宽度为25m,退耕9年撂荒地生态交错带的宽度为40m。%The implementation of Grain for Green ( GG) project affected land use and land cover change, there-by caused the change of mountain agro-ecosystems and natural ecosystems spatial pattern. Plant functional traits, which reflects the adaptation and response of the plant to its environment, is the result of the interaction between plants and its environment. To understand the plant growth and ecosystem stability of ecotone, and to identify lo-cation and width of ecotone with different years of project implementation, this study was conducted on specific leaf area ( SLA) of several plants from ecotone of abandoned land and Pinus yunnanensis forest by selecting 2 sampling plots located in Weixi County of Northwest Yunnan, with similar soil condition and landform but different years of GG project implementation (3 years and 9 years). The results showed that: (1) The average of SLA: ecotone>abandoned land > Pinus yunnanensis forest; ( 2 ) The average SLA of 3-year abandoned land>12 , the average SLA 9-year abandoned land>9. 09; (3) The ecotone of 3-year abandoned land was 25 m, that of 9-year aban-doned land was 40 m.
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