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应用生态学报 ›› 1997, Vol. 8 ›› Issue (2): 134-138.

• 研究论文 • 上一篇    下一篇

半干旱地区小麦群体的根系特征与抗旱性的关系

段舜山1, 谷文祥1, 张大勇2, 李凤民2   

  1. 1. 华南农业大学生态研究所, 广州 510642;
    2. 兰州大学干旱农业生态国家重点实验室, 兰州 730000
  • 收稿日期:1996-07-15 修回日期:1996-12-30 出版日期:1997-03-25 发布日期:1997-03-25
  • 基金资助:

    国家攀登计划基金;兰州大学干旱农业生态国家重点实验室开放基金

Relationship between root system characteristics and drought resistance of wheat populations in semiarid region

Duan Shunshan1, Gu Wenxiang1, Zhang Dayong2, Li Fengmin2   

  1. 1. South China Agricultural University, Guangzhou 510642;
    2. The State Key Laboratory of Arid Agroecology, Lazhou University, Lanzhou 730000
  • Received:1996-07-15 Revised:1996-12-30 Online:1997-03-25 Published:1997-03-25

摘要: 对抗旱性能不同的5个春小麦品种(分别为A、B、C、D、E)的试验表明,在0~120cm土层中,其根密度分别为66、104、137、102和99μg·cm-3;总根量分别为78.7、124.3、164.3、121.8和118.7g·m-2;产量分别为201、207、141、218和190g·m-2.在水分为主导因子的旱作条件下,根系过大的品种,个体间竞争激烈,其群体的抗旱性较差;根系较小的品种,个体间竞争较弱或无竞争,故群体抗旱性较强.

关键词: 半干旱区, 春小麦, 根系, 竞争选择, 抗旱品种, 土壤有机碳, 土壤微生物群落多样性, 土地整理

Abstract: Afield experiment with five spring wheat (Triticum aestivum) varieties 8275(A),79157(B),8832(C),8624(D) and DX24(E) which have different drought resistance shows that the average root density in 0~120 cm soil layer is 66 μg·cm-3 for A,104 μg·cm-3 for B,137 μg·cm-3 for C,102 μg·cm-3 for Dand 99 μg·cm-3 E, and their total root weight is 78.7,124.3,164.3,121.8 and 118.7 g·m-2 ,respectively.The grain yield of these five varieties are respectively 201,207,141,218 and 190 g·m-2 .When water is a primary limiting factor, the drought resistance of wheat is worse for those with large root systems,and an intense competition for water is existed among individuals;but is better for those with small ones, and no competition for water is existed.

Key words: Competitive selection, Drought resistant variety, Root system, Semi arid region, Spring wheat, soil microbial community diversity., land consolidation, soil organic carbon