| Effects of different tillage on leaf water use efficiency of winter wheat |
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| DOI：10.7606/j.issn.1000-7601.2008.01.17 |
| Key Words: leaf water use efficiency diurnal photosynthetic capacity diurnal transpiration capacity diurnal water use efficiency |
| Author Name | Affiliation | | WANG Lili | Faculty of Agronomy?Gansu Agricultural University?Lanzhou,Gansu 730070,China | | HUANG Gaobao | Faculty of Agronomy?Gansu Agricultural University?Lanzhou,Gansu 730070,China | | GUO Qingyi | Faculty of Agronomy?Gansu Agricultural University?Lanzhou,Gansu 730070,China | | HOU Huizhi | Faculty of Resources and Environment?Gansu Agricultural University?Lanzhou,Gansu 730070,China | | ZHU Yongyong | Faculty of Agronomy?Gansu Agricultural University?Lanzhou,Gansu 730070,China | | QIAO Haijun | College of Science?Gansu Agricultural University?Lanzhou，Gansu 730070，China |
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| Abstract: |
| The study on flag leaf water use efficiency and the physio-ecological factors were conducted at the heading stage of winter wheat under traditional tillage and four kinds of conservation tillage in Hexi irrigation area.The way that not only increased crop yield but also protected field land of winter wheat was discovered by the experiment.The results showed that the change range of water use efficiency (WUE) of winter wheat could be decreased by conventional tillage with straw incorporating(TIS),no-tillage(NT) and no-tillage with straw cover(NTS),but increased by no-tillage with stubble standing(NTSS).The diurnal photosynthetic capacity of NT,NTS and TIS were higher than that of T significantly.But their diurnal leaf water use efficiency and diurnal average leaf water use efficiency were lower than that of T because of their higher diurnal transpiration capacity.WUE at leaf level of NTSS and T reached to the highest point at 11∶00～13∶00.It may be because Pn and Tr were at their best optimized combination state.The evaporation of soil would be decreased and CO2 concentration increased by NTS.While the leaf water use efficiency could be increased.The relative humidity(%) at the inlet of the analyzer(RHin) was very important for diurnal leaf water use efficiency of winter wheat.It could decrease transpiration rate and increase the leaf water use efficiency through keeping soil temperature, increasing RHin and CO2 concentration,decreasing leaf water potential(Ψw) and leaf temperature(Tl) and adjusting stomatal conductance(Gs).If we want to enhance the leaf WUE,we should take efficient measures to increase RHin in practice in future. |
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