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应用生态学报 ›› 1999, Vol. 10 ›› Issue (5): 567-569.

• 研究论文 • 上一篇    下一篇

冬小麦对有限水分高效利用的生理机制

上官周平   

  1. 中国科学院-水利部水土保持研究所, 陕西杨陵712100
  • 收稿日期:1997-07-15 修回日期:1997-09-10 出版日期:1999-09-25 发布日期:1999-09-25
  • 作者简介:上官周平,男,35岁,研究员,主要从事作物生理和旱地农业研究,在国内外发表学术论文50多篇,出版专著3部,先后荣获中国科学院优秀青年和全国优秀农业科技工作者等多项奖励.E-mail:zhouping@public.xa.sn.cn
  • 基金资助:

    国家“九五”科技攻关项目(96-004-05-12)和中国科学院重大科研项目(KZ951-B1-211).

Physiological mechanism of highly efficiency use of limited water supply by winter wheat

Shangguan Zhouping   

  1. Institute of Soil and Water Conservation, Academia Sinica and Ministry of Water Resources, Yangling 712100
  • Received:1997-07-15 Revised:1997-09-10 Online:1999-09-25 Published:1999-09-25

摘要: 通过对不同土壤供水条件下的孕穗开花期的冬小麦叶片CO2/H2O气体交换参数的系统测定,研究了光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、细胞间隙CO2浓度(Ci)、叶温(Tl)与水分利用效率(WUE)间的关系。结果表明,WUE并不随Pn的增长直线增长,而是呈现出二次曲线的变化趋势;只有当蒸腾达到一定程度时,Tr才对WUE产生影响,而Tr过大时WUE则有下降的趋势;WUE与Ci呈负相关,随Ci的增加WUE呈递减趋势;叶温升高对光合和蒸腾都有促进作用,当超过了某种限度则表现为抑制作用,表明在一定温度范围内,Tl升高对水分利用不利;随Gs的增大,WUE增大到一定程度则不再增加,甚至出现一种回落趋势.

关键词: 水分利用效率, 生理机制, 冬小麦, 垃圾填埋场覆盖土, Illumina MiSeq测序, 三氯乙烯(TCE), 微生物群落结构

Abstract: By determining the CO2/H2O gas exchange in winter wheat leaves during its earring to flowering stages under different water supply, this paper dealt with the relationships of water use efficiency (WUE) with photosynthetic rate(Pn), transpiration rate(Tr), stomatal conductance(Gs), intercellular CO2 concentration(Ci) and leaf temperature(Tl). The WUE presented a quadratic relation with Pn. It increased to a certain degree with increasing Tr, and then decreased when Tr was higher than a certain value. It decreased remarkably with increasing Ci. The increase of Tl promoted the photosynthesis and transpiration, but when T1 was up to a certain degree, it showed an inhibitory effect on WUE, indicating that in a certain range, the increase of T1 is not beneficial to WUE. With the increase of Gs, WUEreached to a certain high level and then fall down.

Key words: Water use efficiency, Physiological mechanism, Winter wheat, Illumina MiSeq sequencing, landfill cover soil, trichloroethylene, bacterial community structure.