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当前位置: 首页 > 文章 > 准噶尔盆地南缘绿洲——荒漠过渡带梭梭“肥岛”效应特征 土壤通报 2010,41 (1) 100-104
Position: Home > Articles > The Characteristics of "Fertile Island" on Haloxylon ammodendron at an Oasis——desert Ecotone in the South Edge of Junggar Basin Chinese Journal of Soil Science 2010,41 (1) 100-104

准噶尔盆地南缘绿洲——荒漠过渡带梭梭“肥岛”效应特征

作  者：
任雪;褚贵新;宋日权;王国栋;乔旭
单  位：
新疆生产建设兵团绿洲生态农业重点实验室石河子大学农学院资环系
关键词：
荒漠;梭梭(Haloxylon ammodendron);肥岛效应;土壤养分
摘  要：
通过野外调查取样和室内分析的方法研究了绿洲-荒漠过渡带典型灌木梭梭的灌丛下,灌丛间不同层次土壤养分、盐分的差异,旨在揭示干旱荒漠区灌丛的"肥岛"效应特征。结果表明:(1)灌丛下土壤有机质、全氮、碱解氮和速效钾都明显高于灌丛间的,其中表层(0～10cm)土壤分别比灌丛间的高83.1%、113.5%、44.6%、111.8%,土壤电导率提高了167.7%,土壤养分在灌丛下聚集,并且表层含量最高,形成灌丛的"肥岛效应",从而使灌丛植被所覆盖土壤的肥力性状明显区别于未受灌丛影响的土壤。(2)沙漠腹地的土壤养分富集率大于沙漠边缘,其"肥岛"效应也明显大于沙漠边缘的,灌丛土壤全氮和速效磷的富集率较沙漠分别高了25.3%和15.1%。沙漠腹地灌丛下土壤养分的富集程度高可能是荒漠植被适应逆境的一种机制,有利于荒漠植被的生长繁殖和干旱区绿洲生态屏障的形成。
译  名：
The Characteristics of "Fertile Island" on Haloxylon ammodendron at an Oasis——desert Ecotone in the South Edge of Junggar Basin
作  者：
REN Xue,CHU Gui-xin,SONG Ri-quan,WANG Guo-dong,QIAO Xu (Xinjiang Productive and Constructive Group Oasis Ecological Agriculture Key Laboratory/Depart.of Resource and Environmental,College of Agronomy,Shihezi University,Shihezi 832000,China)
关键词：
Desert area;Haloxylon ammodendron;"Fertile Island";Soil nutrients
摘  要：
Field investigation was conducted to explain the effects of "Fertile Island" of one typical deciduous desert shrub Haloxylon ammodendron and its ecological factions in desert environment,at an oasis-desert ecotone in the South Gurbantonggut desert.The results showed as follow:(1) The content of organic matter,total N,alkali-available nitrogen,available K and soil electrical conductivity value(EC) were significantly greater in topsoil (0-10 cm) under the canopy of shrubs than those in topsoil from adjacent interspaces and increased by 83.1%,113.5%,44.6%,111.8%,167.7%,respectively,compared with those of the soil in open spaces.There was no significant difference in pH between the soils under shrub canopies in open land.There existed an obvious "Fertile Island" phenomenon.(2) Soil nutrition enrichment ratio was higher in desert hinterland than that in desert fringe,namely,the enrichment ratio of total N and available K in topsoil increased by 25.3% and 15.1% respectively,compared with those in desert edge.It could be deduced that sandy plant formatted higher soil nutrition enrichment ratio under shrub canopy could be an effective adaptation mechanism to the environmental stress in desert environment.Soil nutrition element accumulation under shrub canopy benefited to sandy plant growth and development,as well as protection oasis in arid region.

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