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中国沙漠 ›› 2011, Vol. 31 ›› Issue (6): 1449-1458.

• 生物土壤与生态 • 上一篇    下一篇

极端干旱环境下的胡杨细根分布与土壤特征

木巴热克·阿尤普, 陈亚宁*, 李卫红, 郝兴明, 马建新, 苏 芮   

  1. 中国科学院新疆生态与地理研究所 荒漠与绿洲生态国家重点实验室, 新疆 乌鲁木齐 830011
  • 收稿日期:2010-08-10 修回日期:2010-10-06 出版日期:2011-11-20 发布日期:2011-11-20

Fine Root Distribution of Populus euphratica Oliv.and Its Relations with Soil Factors under Extremely Arid Environment

Mubareke Ayoupu, CHEN Ya-ning, LIWei-hong, HAO Xing-ming, MA Jian-xin, SU Rui   

  1. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
  • Received:2010-08-10 Revised:2010-10-06 Online:2011-11-20 Published:2011-11-20

摘要: 以塔里木河下游的中龄胡杨为研究对象,采用开挖剖面分层取样法,对胡杨细根(D≤2 mm)的空间分布以及与土壤特征因子之间的关系进行了分析。结果表明:①在长期干旱胁迫下,胡杨细根(D≤2 mm)根长密度(RLD)、根表面积密度(SAD)从表层到地下100 cm土层内,呈逐渐增加趋势,100~140 cm土层内表现为减少的波动分布趋势;细根RLD、SAD集中分布在60~120 cm土层内,约占0~140 cm土层总细根RLD和SAD的74%以上;在水平方向上,距树干0.75~2.5 m范围内,呈逐渐减少趋势,而在3.5~5.5 m范围内呈波动的增加趋势。②胡杨细根(D≤2 mm)RLD和SAD与土壤总盐、土壤有效养分含量之间呈显著负相关关系,适合乘幂模型,与土壤含水率之间呈一定程度的正相关关系,适合三次曲线模型。

关键词: 胡杨细根分布, 根长密度, 根表面积密度, 土壤含水率, 土壤特征因子

Abstract: In order to understand the spatial distribution of P. euphratica fine roots(D≤2 mm)and its relation with soil factors under the extremely arid environment, a middle aged P. euphratica tree which grown at the lower reaches of Tarim River, Xinjiang, China, was selected as a sample tree. By trench profile method, 168 root and soil samples were collected. Results showed that: (1)P. euphratica fine root length density (FRLD), fine root surface area density ( FRSAD) increased from the soil surface to 100-cm soil layer, and decreased from 100-cm to 140-cm layer; P. euphraticaFRLD, FRSAD was mainly concentrated on 60~120 cm soil depth, which accounted for over 74% of whole 0~140 cm soil profiles FRLD, FRSAD. In the horizontal direction, FRLD and FRSAD showed a decreasing trend with a distance between 75~250 cm from the tree trunk, and increased with fluctuation at distance between 350~550 cm. (2)There were negative significant correlations between P. euphratica FRLD and soil total salt, soil available nutrient, and power model can best fit their relations; there was positive correlations between P. euphratica FRLD and soil water, but the correlation was not significant at P=0.05 level, and Cubic model can best fit their relations.

Key words: fine root distribution, root length density, root surface area density, soil water content, soil factor

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