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刺槐根系对深层土壤水分的影响

曹扬1,2;赵忠1;渠美1;成向荣2;王迪海1   

  1. 1西北农林科技大学林学院,杨凌 712100;2黄土高原土壤侵蚀与旱地农业国家重点实验室,杨凌 712100
  • 收稿日期:2006-02-28 修回日期:2005-10-12 出版日期:2006-05-18 发布日期:2006-05-18

Effects of Robinia pseudoacacia roots on deep soil moisture status.

CAO Yang1,2;ZHAO Zhong1;QU Mei1;CHENG Xiangrong2;WANG Dihai1   

  1. 1College of Forestry,Northwest Agriculture & Forestry University,Yangli
    ng 712100,China; 2State Key Laboratory of Soil Erosion and Dryland Farming
    on Loess Plateau,Yangling 712100,China
  • Received:2006-02-28 Revised:2005-10-12 Online:2006-05-18 Published:2006-05-18

摘要: 对黄土高原主要造林树种刺槐根系及其林地土壤水分进行调查和监测,结果表明,在阴坡立地上,刺槐细根在距树干2.0 m范围内的水平分布无明显差异,最大分布深度均为2.0 m;而阳坡立地上刺槐细根在距树干0.5 m处的垂直分布深度可达2.0 m,且阴坡立地上细根密度特征值明显大于阳坡.根系对土壤深层水分的影响范围因不同立地条件下根系分布空间差异而不同,在阳坡立地上,刺槐根系对深层土壤水分的影响深度可达2.7 m处的土层,而在阴坡立地上,这种影响范围可达3.3 m处的土层.

关键词: 光合作用, 蒸腾作用, 气孔阻力, 环境因子, 相关关系

Abstract: he study on the root distribution characters of Robinia pseudoacacia and soil moisture status in the Loess Plateau showed that on shady slope,there was no obvious difference in the horizontal distribution of R.pseudoacacia fine roots within 2.0 m from the stem,and the maximal distribution depth of the roots could reach 2.0 m.In sunny slope,the vertical distribution of the roots within 0.5 m from the stem could also reach that depth.The root amount in shady slope was larger than that in sunny slope,and the affected depth of R.pseudoacacia roots on soil moisture status reached 3.3 m in shady slope,while 2.7 m in sunny slope.

Key words: Photosynthesis, Transpiration, Stomatal resistance, Environmental factors, Correlation