民勤地区梭梭人工林密度与林下植物多样性的关系  

Relationship Between Plantation Density and Diversity of Haloxylon Ammodendron Forest in Minqin County,Gansu Province

作　　者：占玉芳 滕玉风 甄伟玲 钱万建 穆刚 

机构地区：[1]张掖市林业科学研究院,甘肃张掖734000

出　　处：《水土保持通报》2017年第6期62-67,共6页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金项目"河西走廊人工沙漠植被土壤种子库的结构与萌发策略研究"(31560240)

摘　　要：[目的]开展梭梭人工林不同密度对林下植物多样性的影响研究,为合理经营梭梭人工林,充分发挥其生态功能提供技术支持。[方法]以甘肃省民勤县5种不同密度(1 250,1 111,1 000,1 333,1 667株/hm2)10~15年生梭梭人工林林下植物的重要值、丰富度指数、多样性指数、均匀度指数为指标,对林下植物多样性随林分密度的变化规律进行分析。[结果](1)梭梭人工林林下共有植物16种,隶属于9科15属,其中灌木层6科6属6种,草本层4科7属10种。(2)灌木层优势种随着密度变化明显,草本层优势物种受密度影响较小。(3)林下植被多样性对密度响应具有非同步性。随着密度的增加,呈现先增大后减少的变化规律。(4)综合评分表明,民勤县梭梭人工林密度为1 250株/hm2时林下植被多样性水平较好,比较适合林下植被生长。[结论]林下植被多样性指数对密度响应具有非同步性,比较适合林下植被生长的密度为1 250株/hm2。[Objective]Studying the effect of plantation density on understory plant diversity of Haloxylon persicum,to give support for ecological function and technical management of Haloxylon persicum.[Methods]Five types（1 250,1 111,1 000,1 333,1 667 plants/hm2）of 10~15 years＇ stand density were selected,and indices of important values,species richness,species diversity index,evenness were calculated to study the relationship between stand density and plant diversity of Haloxylon ammodendron plantation in Minqin County,Gansu Province.[Results]（1） There were 16 vascular plants in 15 families and 9 genera of the under-growths in Haloxylon ammodendron forest.Among them,there were 6 families,6 genera and 6 species in shrub layer,and 4 families,7 genera and 10 species in herb layer.（2） The dominant species of shrub layer changed obviously with the variation of plantation density,while the dominant species of herb layer were hardly influenced by density.（3） Plant diversity of understory vegetation responded non-linearly to stand density.As stand density increased,plants diversity increased initially and decreased laterally.（4） Comprehensive evaluation showed,when density arrived at 1 250 plants/hm2,the understory plant diversity reached the maximum.At that plantation density,the growth and development of understory vegetationperformed well.[Conclusion]The response of plant diversity of understory vegetation to stand density was non-linear.When the density arrived at 1 250 plants/hm2,the density was more appropriate for the growth and development of understory vegetation.

关 键 词：植物多样性 梭梭人工林 林分密度 甘肃省民勤县 

分 类 号：Q948.15[生物学—植物学]