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荒漠河岸林胡杨吸水根系空间分布特征

司建华1;冯起1;李建林1;赵健2   

  1. 1中国科学院寒区旱区环境与工程研究所, 兰州 730000;
    2内蒙古阿拉善盟额济纳旗草原工作站, 内蒙古额济纳旗 735400
  • 收稿日期:2006-07-21 修回日期:2006-09-08 出版日期:2007-01-10 发布日期:2007-01-10

Spatial distribution pattern of Populus euphratica fine roots in desert riparian forest

SI Jian-hua1; FENG Qi1; LI Jian-lin1; ZHAO Jian2   

  1. 1Cold and Arid Regions Environmental and Engineering Research Institute,
    Chinese Academy of Sciences, Lanzhou 730000, China;2Grassland Station
    of Ejina, Alashan League, Inner Mongolia Autonomous Region, Ejina 735400,
    Inner Mongolia, China
  • Received:2006-07-21 Revised:2006-09-08 Online:2007-01-10 Published:2007-01-10

摘要: 研究植物吸水根系空间分布特征是建立植物根系吸水模型的基础。本文对极端干旱区荒漠河岸林胡杨的吸水根系空间分布特征进行研究。结果表明:在水平方向上,胡杨根长密度分布呈抛物线型,吸水根根量主要集中在0~350 cm,此范围的吸水根根量占0~500 cm总量的91.88%,350 cm以外的吸水根量只占总量的8.12%;在垂直方向上,胡杨根长密度分布呈典型的负指数型,吸水根根量主要集中在0~80 cm土层内,占0~140 cm土层内总量的96.8%。

关键词: 植物, 分泌物, CH4产生, CH4氧化, CH4排放

Abstract: To study the spatial distribution pattern of plant fine root is the basis of constructing water uptake model of plant roots. The study on the spatial distribution pattern of Populus euphratica fine roots in desert riparian forest showed that horizontally, the distribution of P. euphratica root length density presented a parabola curve. The fine roots were concentrated within the range of 0-350 cm from the tree trunk, and their amount occupied 91.88% of the total within 0-500 cm. In vertical direction, the distribution of the fine rootlength density showed a negative exponent correlation with soil depth. The fine roots were concentrated in 0-80 cm soil layer, and their amount accounted for 96.8% of the total in 0-140 cm soil layer.

Key words: Plant, Root exudates, Methane production, Methane oxidation, Methane emission